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现在记账APP也是用途比较广泛
自己写了个简单的demo 欢迎指正

效果

分析

1.思维推导

首先简单的做了下思维推导

2.文件结构

大致框架想好后就可以着手开始准备了

• 数据库管理：coreData
• 视图管理：navigationcontroller
  暂时没有使用cocoapods导入第三方的数据库管理框架
  简单的coreData完全可以胜任
  说白了就两个页面 主界面 和 记账界面

这是完成时的文件结构

3.数据库设计

• Tally 账单表

• identity :String 唯一标识

• expenses :double 支出
• income :double 收入
• timestamp :date 时间戳
• 关系
  • 与TallyDate 日期表:1V1

  • 与TallyType 类型表:1V1

    
    账单表

• TallyDate 日期表

• date :string 日期

• 关系
  -与Tally 账单表：1VN

  
  日期表

• TallyType 类型表

• typename :string 类型名

• typeicon :string 类型图片标

• 关系
  -与Tally 账单表：1VN

  
  类型表

4.页面编写

增加账单页面

由于主页只是一个展示的时光轴界面，UIScrollView加几个按钮就能完成，需要读取数据库内容，所以我们先把内页-增加账单 完成。

• view

• UICollectionView展示账单类型
• 自定义View计算器界面计算存储结果
• model
  • UICollectionViewCell模型 使用了plist和KVC转字典
• controller
  • 负责添加 两个view 及处理两个view的代理

增加账单部分代码

• model

#import <Foundation/Foundation.h>

@interface TallyListCellModel : NSObject
@property (nonatomic,copy)NSString *tallyCellImage;
@property (nonatomic,copy)NSString *tallyCellName;

- (instancetype)initWithDict:(NSDictionary*)dict;
+ (instancetype)tallyListCellModelWithDict:(NSDictionary*)dict;

@end

#import "TallyListCellModel.h"
@implementation TallyListCellModel
- (instancetype)initWithDict:(NSDictionary*)dict {
    self = [super init];
    if (self) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}
+ (instancetype)tallyListCellModelWithDict:(NSDictionary*)dict {
    return [[TallyListCellModel alloc] initWithDict:dict];
}
@end

• 计算界面

#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import <CoreData/CoreData.h>
#import "TimeTallyDemo+CoreDataModel.h"
typedef void(^PositionInViewBlock)(CGPoint point);


@protocol CalculatorViewDelegate <NSObject>

//保存成功
- (void)tallySaveCompleted;

//保存失败
- (void)tallySaveFailed;

//回到原来的位置
- (void)backPositionWithAnimation;

@end

@interface CalculatorView : UIView
//类型图片的size
@property(nonatomic,assign)CGSize imageViewSize;
//类型图
@property(nonatomic,strong)UIImage *image;
//类型名
@property(nonatomic,strong)NSString *typeName;
//账单是否存在 判断 是修改还是新增
@property(nonatomic,assign)BOOL isTallyExist;
@property(nonatomic,strong)id<CalculatorViewDelegate> delegate;
//回调image在整个view中的位置
@property(nonatomic,copy)PositionInViewBlock positionInViewBlock;
//修改账单界面进入时传入参数
- (void)modifyTallyWithIdentity:(NSString *)identity;
@end

#import "CalculatorView.h"

@interface CalculatorView()
@property (nonatomic,assign)CGFloat btnWidth;               //btn宽
@property (nonatomic,assign)CGFloat btnHeight;              //btn高
@property (nonatomic,copy)NSString *nValue;                 //当前输入值
@property (nonatomic,copy)NSString *resutlStr;              //结果值
@property (nonatomic,strong)UILabel *resultLab;             //结果栏
@property (nonatomic,strong)UIButton *addBtn;               //+
@property (nonatomic,strong)UIColor *btnColor;              //按钮颜色
@property (nonatomic,assign)CGColorRef boardLineColor;      //边框线条颜色
@property (nonatomic,strong)UIImageView *imageView;         //tally类型图
@property(nonatomic,strong)UILabel *typeLab;
@property(nonatomic,copy)NSString *tallyIdentity;
@end
static CGFloat const kBoardWidth = 1;
static CGFloat const kMaxCalCount = 9;
@implementation CalculatorView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
        self.btnWidth = (self.frame.size.width-kBoardWidth/2)/4;
        self.btnHeight = self.frame.size.height/5;
        self.nValue = @"";
        self.resutlStr = @"";
        self.typeLab.text = @"";
        self.btnColor = [UIColor grayColor];
        self.boardLineColor = [UIColor lightGrayColor].CGColor;
        self.layer.borderColor = self.boardLineColor;
        self.layer.borderWidth = kBoardWidth;
        self.imageView = [[UIImageView alloc] init];
        [self addSubview:self.imageView];
        [self loadBtn];
    }
    return self;
}

- (void)setImage:(UIImage *)image {
    _image = image;
    
    [NSTimer scheduledTimerWithTimeInterval:1 repeats:NO block:^(NSTimer * _Nonnull timer) {
        _imageView.image = image;
    }];
    
}

- (void)setTypeName:(NSString *)typeName {
    _typeName = typeName;
    self.typeLab.text = typeName;
}

- (void)setImageViewSize:(CGSize)imageViewSize {
    _imageViewSize = imageViewSize;
    _imageView.frame = CGRectMake(10, (self.btnHeight-imageViewSize.height)/2, imageViewSize.width, imageViewSize.height);
    _imageView.backgroundColor = [UIColor clearColor];
    //回调实际位置
    if (_positionInViewBlock) {
        CGPoint point = CGPointMake(10+imageViewSize.width/2, self.frame.origin.y + _imageView.frame.origin.y + imageViewSize.height/2) ;
        _positionInViewBlock(point);
    }
    self.typeLab.frame = CGRectMake(self.imageView.frame.origin.x + self.imageView.frame.size.width + 10, self.imageView.frame.origin.y, imageViewSize.width * 2, imageViewSize.height);
}

//类型名称lab
- (UILabel *)typeLab {
    if (!_typeLab) {
        _typeLab = [[UILabel alloc] init];
        _typeLab.font = [UIFont systemFontOfSize:14];
        [self addSubview:_typeLab];
    }
    return _typeLab;
}

//结果lab
- (UILabel *)resultLab {
    if (!_resultLab) {
        _resultLab = [[UILabel alloc] initWithFrame:CGRectMake(self.frame.size.width * 0.3, 0, self.frame.size.width * 0.7-10, self.btnHeight)];
        _resultLab.text = @"¥ 0.00";
        _resultLab.textAlignment = NSTextAlignmentRight;
        _resultLab.adjustsFontSizeToFitWidth = YES;
        _resultLab.font = [UIFont systemFontOfSize:25];
        _resultLab.userInteractionEnabled = YES;
        UITapGestureRecognizer *tag = [[UITapGestureRecognizer alloc] init];
        tag.numberOfTapsRequired = 1;
        [tag addTarget:self action:@selector(clickResultLab)];
        [_resultLab addGestureRecognizer:tag];
    }
    return _resultLab;
}

- (void)clickResultLab {
    if ([self.delegate respondsToSelector:@selector(backPositionWithAnimation)]) {
        [self.delegate backPositionWithAnimation];
    }
}
//加号
- (UIButton *)addBtn {
    if (!_addBtn) {
        ...
        [_addBtn addTarget:self action:@selector(clickAdd) forControlEvents:UIControlEventTouchUpInside];

    }
    return _addBtn;
}

//普通数字btn
- (void)loadBtn {
    // 1 - 9 btn
    ...
    [btn addTarget:self action:@selector(clickNumber:) forControlEvents:UIControlEventTouchUpInside];
    
    //0 btn
    ...
    [zeroBtn addTarget:self action:@selector(clickNumber:) forControlEvents:UIControlEventTouchUpInside];
    
    //小数点 btn
    ...
    pointBtn.tag = 99;
    [pointBtn addTarget:self action:@selector(clickNumber:) 

    //重置 btn
    ...
    [resetBtn addTarget:self action:@selector(resetZero) forControlEvents:UIControlEventTouchUpInside];  
    
    //DEL btn
    ...
    [delBtn addTarget:self action:@selector(clickDel) forControlEvents:UIControlEventTouchUpInside];
    
    //ok btn
    ...
    [okBtn addTarget:self action:@selector(clickOk) forControlEvents:UIControlEventTouchUpInside];
    
    [self addSubview:self.addBtn];
    [self addSubview:self.resultLab];

}

//点击数字按键
- (void)clickNumber:(UIButton*)btn {
    
    if(self.addBtn.isSelected){
        self.nValue = @"";
    }
    NSString *currentValue = @"";
    if (btn.tag == 99) {
        //有 . 就不加 .
        if ([self.nValue rangeOfString:@"."].location == NSNotFound) {
            currentValue = @".";
        }
    }else {
        currentValue = [NSString stringWithFormat:@"%ld",(long)btn.tag];
    }

    self.nValue = [self.nValue stringByAppendingString:currentValue];
  
    
    //保留小数点后两位
    NSRange pointRange = [self.nValue rangeOfString:@"."];
    if (pointRange.location != NSNotFound) {
        if ([self.nValue substringFromIndex:pointRange.location+1].length > 2) {
            self.nValue = [self.nValue substringWithRange:NSMakeRange(0, pointRange.location + 3)];
        }
        
        //总位数不超过9 处理小数部分
        if ([self.nValue substringToIndex:pointRange.location].length > kMaxCalCount) {
            self.nValue = [NSString stringWithFormat:@"%0.2f",[self.nValue doubleValue]];
            self.nValue = [self.nValue substringToIndex:kMaxCalCount+3];
        }

    } else {
        //总位数不超过9 整数部分
        if (self.nValue.length > kMaxCalCount) {
            self.nValue = [NSString stringWithFormat:@"%0.2f",[self.nValue doubleValue]];
            self.nValue = [self.nValue substringToIndex:kMaxCalCount];
        }
    }

    //显示数字
    self.resultLab.text = [NSString stringWithFormat:@"¥ %.2f",[self.nValue doubleValue]];
    self.addBtn.selected = NO;
    
    NSLog(@"new = %@",self.nValue);
}

//单击加号
- (void)clickAdd {
    //显示结果  点击后nValue清零
    if (!self.addBtn.isSelected) {
        self.addBtn.selected = YES;
        double result = [self.resutlStr doubleValue] + [self.nValue doubleValue] ;
        self.resutlStr = [NSString stringWithFormat:@"%.2f",result];
        self.resultLab.text = [NSString stringWithFormat:@"¥ %.2f",[self.resutlStr doubleValue]];
        NSLog(@"resutl = %@",self.resutlStr);
    }
    
}

//重置0
- (void)resetZero {
    self.resutlStr = @"";
    self.nValue = @"";
    self.resultLab.text = @"¥ 0.00";
}

//退格
- (void)clickDel {
    if (self.nValue.length > 0) {
        self.nValue = [self.nValue substringWithRange:NSMakeRange(0, self.nValue.length-1)];
    }
    NSLog(@"-----%@",self.nValue);
    self.resultLab.text = [NSString stringWithFormat:@"¥ %.2f",[self.nValue doubleValue]];
}
//完成
- (void)clickOk {
    //存在 使用修改保存方式 不存在 使用新增保存方式
    if (self.isTallyExist) {
        [self modifyTallySavedWithIdentity:self.tallyIdentity];
    } else {
        [self addTallySave];
    }
}

//增加账单保存
- (void)addTallySave {
    if ( ![self.typeLab.text isEqualToString:@""] && [self.nValue doubleValue] != 0) {
        [self clickAdd];
        //存数据
        NSManagedObjectContext *managedObjectContext = ((AppDelegate *)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd"];
        NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];
        //查询有无对应的date 有则使用无则创建
        NSFetchRequest *fdate = [TallyDate fetchRequest];
        NSArray<NSSortDescriptor *> *sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:YES]];
        fdate.sortDescriptors = sortDescriptors;
        NSPredicate *p = [NSPredicate predicateWithFormat:@"date = %@",dateString];
        fdate.predicate = p;
        NSArray<TallyDate *> *ss = [managedObjectContext executeFetchRequest:fdate error:nil];
        TallyDate *date;
        if (ss.count > 0) {
            date = ss[0];
        } else {
            date = [[TallyDate alloc] initWithContext:managedObjectContext];
            date.date = dateString;
        }
        //配置数据
        Tally *model = [[Tally alloc] initWithContext:managedObjectContext];
        NSFetchRequest *ftype = [TallyType fetchRequest];
        NSPredicate *ptype = [NSPredicate predicateWithFormat:@"typename = %@",self.typeLab.text];
        ftype.predicate = ptype;
        NSArray<TallyType *> *sstype = [managedObjectContext executeFetchRequest:ftype error:nil];
        TallyType *type = [sstype firstObject];
        //给关系赋值
        model.typeship = type;
        model.dateship = date;
        model.identity = [NSString stringWithFormat:@"%@", [model objectID]];
        model.timestamp = [NSDate date];
        if ([self.typeLab.text isEqualToString:@"工资"]) {
            model.income = [self.resutlStr doubleValue];
            model.expenses = 0;
        } else {
            model.expenses = [self.resutlStr doubleValue];
            model.income = 0;
        }
        //存
        [managedObjectContext save:nil];
        if ([self.delegate respondsToSelector:@selector(tallySaveCompleted)]) {
            [self.delegate tallySaveCompleted];
        }
    } else {
        if ([self.delegate respondsToSelector:@selector(tallySaveFailed)]) {
            [self.delegate tallySaveFailed];
        }
        NSLog(@"不存");
    }
}

//修改账单保存
- (void)modifyTallySavedWithIdentity:(NSString *)identity {
    [self clickAdd];
       if ([self.resutlStr doubleValue] == 0) {
        if ([self.delegate respondsToSelector:@selector(tallySaveFailed)]) {
            [self.delegate tallySaveFailed];
        }
        NSLog(@"不存");
        return;
    }
    self.addBtn.selected = NO;
    NSManagedObjectContext *managedObjectContext = ((AppDelegate *)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
    //设置账单类型
    NSFetchRequest *ftype = [TallyType fetchRequest];
    NSPredicate *ptype = [NSPredicate predicateWithFormat:@"typename = %@",self.typeLab.text];
    ftype.predicate = ptype;
    NSArray<TallyType *> *sstype = [managedObjectContext executeFetchRequest:ftype error:nil];
    TallyType *type = [sstype firstObject];
    //找出当前账单
    NSFetchRequest *fetchRequest = [Tally fetchRequest];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identity = %@", identity];
    [fetchRequest setPredicate:predicate];
    NSArray *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:nil];
    //配置当前账单
    Tally *tally = [fetchedObjects firstObject];
    tally.typeship = type;
    if ([self.typeLab.text isEqualToString:@"工资"]) {
        tally.income = [self.resutlStr doubleValue];
        tally.expenses = 0;
    } else {
        tally.expenses = [self.resutlStr doubleValue];
        tally.income = 0;
    }
    [managedObjectContext save:nil];
    if ([self.delegate respondsToSelector:@selector(tallySaveCompleted)]) {
        [self.delegate tallySaveCompleted];
    }
}


//修改界面传值
- (void)modifyTallyWithIdentity:(NSString *)identity {
    self.tallyIdentity = identity;
    NSManagedObjectContext *managedObjectContext = ((AppDelegate *)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
    NSFetchRequest *fetchRequest = [Tally fetchRequest];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identity = %@", identity];
    [fetchRequest setPredicate:predicate];
    NSArray *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:nil];
    Tally *tally = [fetchedObjects firstObject];
    self.imageView.image = [UIImage imageNamed:tally.typeship.typeicon];
    self.typeLab.text = tally.typeship.typename;
    self.nValue = tally.income > 0?[NSString stringWithFormat:@"%@",@(tally.income)]:[NSString stringWithFormat:@"%@",@(tally.expenses)];
    self.resultLab.text = [NSString stringWithFormat:@"¥ %.2f",[self.nValue doubleValue]];
    self.isTallyExist = YES;
}

@end

• 类型选择界面 自定义cell就不贴出来了 就一个图片和label

#import <UIKit/UIKit.h>
#import "TallyListCell.h"
#import <CoreData/CoreData.h>
#import "TimeTallyDemo+CoreDataModel.h"
#import "AppDelegate.h"

@protocol TallyListViewDelegate <NSObject>
//选择对应cell 传递 image title cell的实际位置
- (void)didSelectItem:(UIImage*)cellImage andTitle:(NSString*)title withRectInCollection:(CGRect)itemRect;
//滚动到底
- (void)listScrollToBottom;
@end

@interface TallyListView : UICollectionView
@property(nonatomic,strong)id<TallyListViewDelegate> customDelegate;
@end

#import "TallyListView.h"
@interface TallyListView()<UICollectionViewDelegate,UICollectionViewDataSource>

@property (nonatomic, strong) NSArray *tallyListArray;
@property (nonatomic, assign) CGFloat offsety;

@end
static NSString *cellId = @"tallyListCellID";
@implementation TallyListView

//读取plist数据
- (NSArray *)tallyListArray {
    if (!_tallyListArray) {
        NSMutableArray *res = [NSMutableArray array];
        NSString *path = [[NSBundle mainBundle] pathForResource:@"TallyList" ofType:@"plist"];
        NSArray *list = [NSArray arrayWithContentsOfFile:path];
        for (NSDictionary *dict in list) {
            TallyListCellModel *model = [TallyListCellModel tallyListCellModelWithDict:dict];
            [res addObject:model];
        }
        _tallyListArray = [NSArray arrayWithArray:res];
        [self writeToSqlite];
    }
    return  _tallyListArray;
}

- (void)writeToSqlite {
    
    //将类型名字和图片信息写入数据库
    NSManagedObjectContext *managedObjectContext = ((AppDelegate*)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
    for (TallyListCellModel *model in self.tallyListArray) {
        
        //查询有无对应的type 有则使用无则创建
        NSFetchRequest *fdate = [TallyType fetchRequest];
        NSPredicate *p = [NSPredicate predicateWithFormat:@"typename = %@",model.tallyCellName];
        fdate.predicate = p;
        NSArray<TallyType *> *ss = [managedObjectContext executeFetchRequest:fdate error:nil];
        if (ss.count == 0) {
            TallyType *type = [[TallyType alloc] initWithContext:managedObjectContext];
            type.typename = model.tallyCellName;
            type.typeicon = model.tallyCellImage;
            [managedObjectContext save:nil];
        }

    }
}

//初始化
- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout {
    self = [super initWithFrame:frame collectionViewLayout:layout];
    if (self) {
        self.delegate = self;
        self.dataSource = self;
        self.backgroundColor = [UIColor clearColor];
        [self registerNib:[UINib nibWithNibName:@"TallyListCell" bundle:nil] forCellWithReuseIdentifier:cellId];     
    }
    return self;
}


#pragma mark - UICollectionViewDelegate & UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.tallyListArray.count;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    TallyListCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellId forIndexPath:indexPath];
    cell.cellModel = self.tallyListArray[indexPath.item];
    return cell;
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    TallyListCell *cell = (TallyListCell*)[collectionView cellForItemAtIndexPath:indexPath];
    //cell在collectionView的位置
    CGRect cellRect = [collectionView convertRect:cell.frame fromView:collectionView];
    //image在cell中的位置
    CGRect imgInCellRect = cell.imageView.frame;
    CGFloat x = cellRect.origin.x + imgInCellRect.origin.x;
    CGFloat y = cellRect.origin.y + imgInCellRect.origin.y + 64 - self.offsety;
    //图片在collectionView的位置
    CGRect imgRect = CGRectMake(x, y, imgInCellRect.size.width, imgInCellRect.size.height);
    //回调
    if ([self.customDelegate respondsToSelector:@selector(didSelectItem:andTitle:withRectInCollection:)]){
        [self.customDelegate didSelectItem:cell.imageView.image andTitle:cell.imageLab.text withRectInCollection:imgRect];
    }
  
}

//外部调用 用于修改账单传值
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    self.offsety = scrollView.contentOffset.y;
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    CGFloat bottomY = self.contentSize.height - self.frame.size.height;
    if (scrollView.contentOffset.y >= bottomY) {
        NSLog(@"计算器下去");
        if ([self.customDelegate respondsToSelector:@selector(listScrollToBottom)]) {
            [self.customDelegate listScrollToBottom];
        }
    }
}
@end

主页面界面

• model

• 用于传递给账单界面的数据模型
• view
  • 时间线绘图
• controller
  • 处理时间线视图的删改查

主界面部分代码

• model

#import <Foundation/Foundation.h>

typedef enum : NSUInteger {
    TallyMoneyTypeIn = 0,
    TallyMoneyTypeOut,
    
} TallyMoneyType;

@interface TimeLineModel : NSObject
@property(nonatomic,copy)NSString *tallyIconName;
@property(nonatomic,assign)double tallyMoney;
@property(nonatomic,assign)TallyMoneyType tallyMoneyType;
@property(nonatomic,copy)NSString *tallyDate;
@property(nonatomic,copy)NSString *tallyType;
@property(nonatomic,copy)NSString *identity;
@property(nonatomic,assign)double income;
@property(nonatomic,assign)double expense;

@end

• 时间线视图
  这里用runtime方法为uibutton分类给时间线上的btn添加了两个属性
  keyWithBtn ：用于存储日期
  panelBtnType ：用于存储按钮是修改还是删除

typedef enum : NSUInteger {
    PanelViewBtnTypeLeft = 0,
    PanelViewBtnTypeRight,
} PanelViewBtnType;
//使用runtime 给uibutton扩展 属性
@interface UIButton (BtnWithKey)
@property(nonatomic,copy)NSString *keyWithBtn;
@property(nonatomic,assign)PanelViewBtnType panelBtnType;
@end
static const void *kKeyWithBtn = @"keyWithBtn";
static const void *kPanelBtnType = @"panelBtnType";
@implementation UIButton (BtnWithKey)

- (NSString *)keyWithBtn {
    return objc_getAssociatedObject(self, kKeyWithBtn);
    
}
- (void)setKeyWithBtn:(NSString *)keyWithBtn {
    objc_setAssociatedObject(self, kKeyWithBtn, keyWithBtn, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (PanelViewBtnType)panelBtnType {
    return [objc_getAssociatedObject(self, kPanelBtnType) intValue];
}

- (void)setPanelBtnType:(PanelViewBtnType)panelBtnType {
    objc_setAssociatedObject(self, kPanelBtnType, [NSNumber numberWithUnsignedInteger:panelBtnType], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end

#import "TimeLineView.h"

@interface TimeLineView()
@property(nonatomic,strong)UIView *panelView;       //删除、修改 面板
@end


@implementation TimeLineView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
    }
    return self;
}


- (void)drawRect:(CGRect)rect {
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    int keyIndex = 0;
    CGFloat aDateAllLine = 0;
    for (NSString *key  in self.timeLineModelsDict.allKeys) {
        //读取字典对应key的数组
        NSArray<TimeLineModel*> *modelArray = self.timeLineModelsDict[key];
        //画线画日期
        CGRect dateRect = CGRectMake(self.center.x-kDateWidth/2, aDateAllLine, kDateWidth, kDateWidth);
        CGContextAddEllipseInRect(context, dateRect);
        CGContextSetFillColorWithColor(context, [UIColor grayColor].CGColor);
        CGContextFillPath(context);
        CGContextStrokePath(context);
        CGRect dateLabRect = CGRectMake(0, aDateAllLine, self.frame.size.width/2-kBtnWidth, kBtnWidth/2);
        //日期lab
        UILabel *dateLab = [[UILabel alloc] initWithFrame:dateLabRect];
        dateLab.textAlignment = NSTextAlignmentRight;
        dateLab.text = key;
        [dateLab setTextColor:[UIColor blueColor]];
        [self addSubview:dateLab];
        
        for (int i = 0 ; i < modelArray.count; i++) {
            //画竖线
            CGFloat start = aDateAllLine + kDateWidth + i * (kLineHeight+kBtnWidth);
            CGFloat end = aDateAllLine + kDateWidth+kLineHeight + i * (kLineHeight+kBtnWidth);
            CGContextMoveToPoint(context, self.center.x, start);
            CGContextAddLineToPoint(context, self.center.x, end);
            CGContextSetLineWidth(context, kLineWidth);
            CGContextSetStrokeColorWithColor(context, [UIColor grayColor].CGColor);
            CGContextStrokePath(context);
            
            //收支类型btn
            CGRect btnRect = CGRectMake(self.center.x-kBtnWidth/2, end, kBtnWidth, kBtnWidth);
            UIButton *btn = [[UIButton alloc] initWithFrame:btnRect];
            btn.tag = i;
            btn.keyWithBtn = key;
            [btn setImage:[UIImage imageNamed:modelArray[i].tallyIconName] forState:UIControlStateNormal];
            btn.layer.masksToBounds = YES;
            [btn addTarget:self action:@selector(clickTallyTypeBtn:) forControlEvents:UIControlEventTouchUpInside];
            [self addSubview:btn];
            
            //收支情况
            CGFloat labX = modelArray[i].tallyMoneyType == TallyMoneyTypeIn ? 0:self.center.x + kBtnWidth;
            CGFloat labY = btnRect.origin.y;
            CGFloat labWidth = self.frame.size.width/2 - kBtnWidth ;
            CGFloat labHeight = btnRect.size.height;
            UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(labX, labY, labWidth, labHeight)];
            label.textAlignment = modelArray[i].tallyMoneyType == TallyMoneyTypeIn ? NSTextAlignmentRight:NSTextAlignmentLeft;
            label.text = [NSString stringWithFormat:@"%@ %0.2f",modelArray[i].tallyType,modelArray[i].tallyMoney];
            [self addSubview:label];
            
            //最后一条线 最后一条账单不画此线
            if (keyIndex < self.timeLineModelsDict.allKeys.count) {
                CGFloat lastStart = aDateAllLine;
                CGFloat lastEnd = kLineHeight;
                CGContextMoveToPoint(context, self.center.x, lastStart);
                CGContextAddLineToPoint(context, self.center.x, lastEnd);
                CGContextSetLineWidth(context, kLineWidth);
                CGContextSetStrokeColorWithColor(context, [UIColor grayColor].CGColor);
                CGContextStrokePath(context);
            }
        }
        
        //当前时间线总长
        aDateAllLine = aDateAllLine + kDateWidth + (kBtnWidth+kLineHeight)*modelArray.count + kLineHeight;
        keyIndex++;

    }
    

}

//刷新view时清空UI
- (void)setNeedsDisplay {
    [super setNeedsDisplay];
    for (UIView *view in self.subviews) {
        [view removeFromSuperview];
    }
}

//点击账单类型按钮
- (void)clickTallyTypeBtn:(UIButton *)btn {
    NSLog(@"%@",btn.keyWithBtn);
    //清空控制板
    if (self.panelView) {
        [self.panelView removeFromSuperview];
    }
    //控制板出现
    self.panelView = [[UIView alloc] initWithFrame:CGRectMake(0, btn.frame.origin.y, self.frame.size.width, btn.frame.size.height)];
    self.panelView.backgroundColor = [UIColor whiteColor];
    self.panelView.userInteractionEnabled = YES;
    [self addSubview:self.panelView];
    //左按钮 删除
    ...
    leftBtn.panelBtnType = PanelViewBtnTypeLeft;
    leftBtn.tag = btn.tag;
    leftBtn.keyWithBtn = btn.keyWithBtn;
    [leftBtn addTarget:self action:@selector(deleteCurrentTally:) forControlEvents:UIControlEventTouchUpInside];

    //右按钮 修改
    ...
    rightBtn.panelBtnType = PanelViewBtnTypeRight;
    rightBtn.tag = btn.tag;
    rightBtn.keyWithBtn = btn.keyWithBtn;
    [rightBtn addTarget:self action:@selector(modifyCurrentTally:) forControlEvents:UIControlEventTouchUpInside];
    //中间按钮 收回panelview
   ...
    [middleBtn addTarget:self action:@selector(clickMiddleBtn) forControlEvents:UIControlEventTouchUpInside];    
}

//btn出现时动画
- (void)btnShowAnimation:(UIButton*)btn{
      //layer动画 左右分开    
}

//点击中间按钮 控制板收回
- (void)clickMiddleBtn{
    for (UIButton *btn in self.panelView.subviews) {
        [self btnDismissAnimation:btn];
    }
    [NSTimer scheduledTimerWithTimeInterval:0.5 repeats:NO block:^(NSTimer * _Nonnull timer) {
        [self.panelView removeFromSuperview];
    }];
    
}

//btn消失时动画
- (void)btnDismissAnimation:(UIButton*)btn{
    //两边收回
}

//删除当前账单  回调给controller处理
- (void)deleteCurrentTally:(UIButton*)btn {
    if ([self.delegate respondsToSelector:@selector(willChangeValueForKey:)]) {
        NSArray<TimeLineModel*>*array = self.timeLineModelsDict[btn.keyWithBtn];
        [self.delegate willDeleteCurrentTallyWithIdentity:array[btn.tag].identity];
    }
}

//修改当前账单  回调给controller处理
- (void)modifyCurrentTally:(UIButton*)btn {
    if ([self.delegate respondsToSelector:@selector(willModifyCurrentTallyWithIdentity:)]) {
        NSArray<TimeLineModel*>*array = self.timeLineModelsDict[btn.keyWithBtn];
        [self.delegate willModifyCurrentTallyWithIdentity:array[btn.tag].identity];
    }
}
@end

• controller

#import "ViewController.h"
#import "AddTallyViewController.h"
#import "TimeLineView.h"
@interface ViewController ()<TimeLineViewDelegate>
@property(nonatomic,strong)UIScrollView *scrollView;
@property(nonatomic,strong)NSDictionary *timeLineModelsDict;
@property(nonatomic,assign)CGFloat allDateAllLine;
@property (weak, nonatomic) IBOutlet UILabel *incomLab;
@property (weak, nonatomic) IBOutlet UILabel *expenseLab;

@end
@implementation ViewController



- (UIScrollView *)scrollView {
    if (!_scrollView) {
         _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 64+80, self.view.frame.size.width, self.view.frame.size.height-64-80)];
        _scrollView.backgroundColor = [UIColor whiteColor];
    }
    return _scrollView;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    NSLog(@"%@",NSHomeDirectory());
    self.title = @"我的账本";
    [self.view addSubview:self.scrollView];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//增加一条账单
- (IBAction)clickAddTally:(id)sender {
    AddTallyViewController *addVC = [[AddTallyViewController alloc] init];
    [self.navigationController pushViewController:addVC animated:YES];
}

//出现时 刷新整个时间线
- (void)viewWillAppear:(BOOL)animated {
    NSLog(@"will");
    [self showTimeLineView];
 
}

- (void)showTimeLineView {
    //先读取数据库中内容 封装成字典
    [self readSqliteData];
    
    //移除上一个timelineView
    for (UIView *view in self.scrollView.subviews) {
        if (view.tag == 1990) {
            [view removeFromSuperview];
        }
    }
    
    //计算总收入 和 总支出
    double incomeTotal = 0;
    double expenseTotal = 0;
    self.allDateAllLine = 0;
    //计算时间线长度
    for (NSString *key  in self.timeLineModelsDict.allKeys) {
        NSArray<TimeLineModel*> *modelArray = self.timeLineModelsDict[key];
        //一天的时间线总长
        self.allDateAllLine = self.allDateAllLine + kDateWidth + (kBtnWidth+kLineHeight)*modelArray.count + kLineHeight;
        for (TimeLineModel *model in modelArray) {
            incomeTotal = incomeTotal + model.income;
            expenseTotal = expenseTotal + model.expense;
        }
    }
    
    self.incomLab.text = [NSString stringWithFormat:@"%.2f",incomeTotal];
    self.expenseLab.text = [NSString stringWithFormat:@"%.2f",expenseTotal];
    
    //设置时间线视图timelineview
    CGRect rect  = CGRectMake(0, 0, self.view.frame.size.width, self.allDateAllLine);
    TimeLineView *view = [[TimeLineView alloc] initWithFrame:rect];
    view.tag = 1990;
    view.delegate = self;
    view.backgroundColor = [UIColor whiteColor];
    view.timeLineModelsDict = self.timeLineModelsDict;
    [self.scrollView addSubview:view];
    self.scrollView.contentSize = CGSizeMake(self.view.frame.size.width, self.allDateAllLine);
    //滚动到顶端
    [self.scrollView setContentOffset:CGPointZero animated:YES];
    
    
    
}


//读取数据库中的数据  以字典的形式 key：@"日期" object：[账单信息]
- (void)readSqliteData{
    NSManagedObjectContext *managedObjectContext = ((AppDelegate*)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
    self.timeLineModelsDict = nil;
    
    //先查询日期 遍历日期表
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"TallyDate" inManagedObjectContext:managedObjectContext];
    [fetchRequest setEntity:entity];
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO];
    [fetchRequest setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    NSError *error = nil;
    NSArray<TallyDate*> *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
    NSMutableDictionary *dict = [NSMutableDictionary dictionary];
    //再查询该日期下的tally表
    for (TallyDate *date in fetchedObjects) {
        NSString *key = date.date;
        NSFetchRequest *fetchRequest2 = [[NSFetchRequest alloc] init];
        NSEntityDescription *entity2 = [NSEntityDescription entityForName:@"Tally" inManagedObjectContext:managedObjectContext];
        [fetchRequest2 setEntity:entity2];
        //在tally表中 筛选 为该日期的tally 并逆序排列
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"dateship.date = %@",key];
        [fetchRequest2 setPredicate:predicate];
        NSSortDescriptor *sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey:@"timestamp" ascending:NO];
        [fetchRequest2 setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor2, nil]];
        NSError *error = nil;
        NSArray<Tally*> *fetchedObjects2 = [managedObjectContext executeFetchRequest:fetchRequest2 error:&error];
        NSMutableArray *array = [NSMutableArray array];
        //遍历 tally表 将表中的每个结果保存下来
        for (Tally *tally in fetchedObjects2) {
            TimeLineModel *model = [[TimeLineModel alloc] init];
            model.tallyDate = tally.dateship.date;
            model.tallyIconName = tally.typeship.typeicon;
            model.tallyMoney = tally.income > 0 ? tally.income:tally.expenses;
            model.tallyMoneyType = tally.income > 0 ? TallyMoneyTypeIn:TallyMoneyTypeOut;
            model.tallyType = tally.typeship.typename;
            model.identity = tally.identity;
            model.income = tally.income;
            model.expense = tally.expenses;
            [array addObject:model];
        }
        [dict setObject:array forKey:key];
    }
    self.timeLineModelsDict = dict;
}

//删除前的确认
- (void)willDeleteCurrentTallyWithIdentity:(NSString*)identity {
    
    UIAlertController *alertVC =[UIAlertController alertControllerWithTitle:@"提示" message:@"确认删除" preferredStyle:UIAlertControllerStyleAlert ];
    [alertVC addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        //从数据库中删除 Tally表中对应identity字段行
        NSManagedObjectContext *managedObjectContext = ((AppDelegate*)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
        NSFetchRequest *fetchRequest = [Tally fetchRequest];
        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identity = %@", identity];
        [fetchRequest setPredicate:predicate];
        NSError *error = nil;
        NSArray *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
        [managedObjectContext deleteObject:[fetchedObjects firstObject]];
        [managedObjectContext save:&error];
        //删除完成后 刷新视图
        [self showTimeLineView];

    }]];
    [alertVC addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
    [self presentViewController:alertVC animated:YES completion:nil];

}

//TimeLineViewDelegate  delegate 修改前的准备
- (void)willModifyCurrentTallyWithIdentity:(NSString*)identity {
    AddTallyViewController *addVC = [[AddTallyViewController alloc] init];
    [addVC selectTallyWithIdentity:identity];
    [self.navigationController pushViewController:addVC animated:YES];

}
@end

5.结束

由于coredata增删改查时的代码量实在是太大，我们可以优化一下，将数据库操作全部放到一个类中，这样代码逻辑会更清晰一点，可读性更强。
也是也到这里才想到数据库封装。所以刚刚去改了下。
所以上面的代码都包括冗长的coreData操作

创建一个 数据库操作的单例

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
#import "TimeTallyDemo+CoreDataModel.h"
#import "AppDelegate.h"
#import "TimeLineModel.h"
@interface CoreDataOperations : NSObject
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
//单例
+ (instancetype)sharedInstance;
//从数据库中删除 Tally表中对应identity字段行
- (void)deleteTally:(Tally*)object;

//保存
- (void)saveTally;

//读取对应字段
- (Tally*)getTallyWithIdentity:(NSString *)identity;

//获取对应类型
- (TallyType*)getTallyTypeWithTypeName:(NSString*)typeName;

//读取数据库中的数据  以字典的形式 key：@"日期" object：[账单信息]
- (NSDictionary*)getAllDataWithDict;
@end

#import "CoreDataOperations.h"
@interface CoreDataOperations()
@end

@implementation CoreDataOperations

static CoreDataOperations *instance = nil;

+ (instancetype)sharedInstance
{
    return [[CoreDataOperations alloc] init];
}

+ (instancetype)allocWithZone:(struct _NSZone *)zone
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [super allocWithZone:zone];
    });
    return instance;
}

- (instancetype)init
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [super init];
        if (instance) {
            instance.managedObjectContext = ((AppDelegate*)[UIApplication sharedApplication].delegate).persistentContainer.viewContext;
        }
    });
    return instance;
}

//从数据库中删除 Tally表中某一数据
- (void)deleteTally:(Tally*)object {
    [self.managedObjectContext deleteObject:object];
}

//保存
- (void)saveTally {
    [self.managedObjectContext save:nil];
}

//读取对应字段
- (Tally*)getTallyWithIdentity:(NSString *)identity {
    //返回对应账单
}

//获取对应类型
- (TallyType*)getTallyTypeWithTypeName:(NSString*)typeName {
    //返回对应账单类型
}

//读取数据库中的数据  以字典的形式 key：@"日期" object：[账单信息]
- (NSDictionary*)getAllDataWithDict{
        //遍历查询
    return dict;
}

@end

Demo地址

欢迎加星关注
https://github.com/gongxiaokai/TimeTallyDemo
简书地址
http://www.jianshu.com/u/7897b0bd4a55