coreData数据库简单项目案列

#import "ViewController.h"
#import "Person.h"
@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
@property (nonatomic,strong)NSManagedObjectContext *context;
@property (nonatomic,strong)NSMutableArray *dataSoure;
@property (nonatomic,strong)UITableView *tablew;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addAction)];
    [self prepareForCoreData];
    [self initTableView];
}

- (void)initTableView{
    self.tablew = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tablew.delegate = self;
    self.tablew.dataSource = self;
    
    
    [self.view addSubview:self.tablew];
    
}
- (void)addAction{
    [self showAlertWithFriend:nil];
   }
- (void)saveAction:(UIAlertController *) alert{
    UITextField *usernameText = alert.textFields.firstObject;
    UITextField *personIdText = alert.textFields.lastObject;
    
    NSString *username= usernameText.text;
    NSNumber *personId = @(personIdText.text.integerValue);
    
    Person * person = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:self.context];
    person.name = username;
    person.personID = personId;
    
    [self.context save:nil];
    
    [self.dataSoure addObject:person];
    
    [self.tablew reloadData];

    
}


#pragma mark ---协议方法----
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    
    return self.dataSoure.count;
    
}

- (UITableViewCell * )tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    static NSString *reuseid = @"cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseid];
    
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuseid];
    }
    
    
    
    // 展示
    Person *p = self.dataSoure[indexPath.row];
    
    cell.textLabel.text = p.name;
    cell.detailTextLabel.text = [NSString stringWithFormat:@"%@", p.personID];
    
    
    
    return cell;
    
}
#pragma mark ---数据库协议----
- (void)prepareForCoreData{
    
    self.context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    // 找地址
    // .xcdatamodeld 文件, 编译后, 会生成 .momd 这样的文件
    // 所以, 我们找 .momd 类型即可
    NSString *path = [[NSBundle mainBundle] pathForResource:@"CoreDataProject" ofType:@"momd"];
    
    // 实例化数据存储模型
    // 在这里, 需要传入 xcdatamodeld 文件的地址
    NSManagedObjectModel *model = [[NSManagedObjectModel alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path]];
    // 实例化数据持久存储协调器
    NSPersistentStoreCoordinator *coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model];
    // 设置数据库文件保存的路径
    // ~/
    NSString *storePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).firstObject stringByAppendingString:@"/xiaoqiang.db"];
    
    // 设置存储类型
    [coordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[NSURL fileURLWithPath:storePath] options:nil error:nil];
    
    [self.context  setPersistentStoreCoordinator:coordinator];
    
    
}
#pragma mark ---选中回调---

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    
//     [self showAlertWithFriend:nil];
    //改弹窗
    [self showAlertWithFriend:self.dataSoure[indexPath.row]];
    
    
}
#pragma mark ---弹窗展示
- (void)showAlertWithFriend:(Person *)person{

//     [self a]
    NSLog(@"进来了");
    //如果模型存在，表示修改操作
    
    //如果模型不存在，表示增的操作
    
    UIAlertController *altert = [UIAlertController alertControllerWithTitle:@"提示" message:@"请输入用户信息" preferredStyle:UIAlertControllerStyleAlert];
    //添加输入框
    [altert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        // 这里写输入框的配置属性
        textField.placeholder =@"请输入姓名";
        
        //输入框文本 可以编辑
        textField.font = [UIFont systemFontOfSize:13];
        
        textField.text = person.name;
        
        
    }];
    
    [altert addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        // 这里写输入框的配置属性
        textField.placeholder =@"请输入手机号码";
        
        //输入框文本 可以编辑
        textField.font = [UIFont systemFontOfSize:13];
        
        NSString *str = [NSString stringWithFormat:@"%@",person.personID];
     textField.text = str;
        //
        //        textField.keyboardType = UIKeyboardTypeNumberPad;
    }];
    
    UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    
    UIAlertAction *done = [UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault handler:^(UIAlertAction * action) {
        
        //        [self addAction:altert];
        // 区分不同的情况, 分别调用
        // person如果存在, 表示是改的操作
        // person如果不存在, 表示是增的操作
        if (person) {
            
            [self updateAction:altert person:person];
        }
        else{
            
            [self saveAction:altert];
            
            
        }
        
    }];
    
    [altert addAction:cancel];
    [altert addAction:done];
    
    [self presentViewController:altert animated:YES completion:nil];
    
    


}
- (void)updateAction:(UIAlertController *)altert person:(Person *)person{
    //2.本地修改
    //需要一个新的模型来存储新的内容
    UITextField *usernameText = altert.textFields.firstObject;
    UITextField *phoneText = altert.textFields.lastObject;
    
//    Person *newPerson = [[Person alloc] init];
    
    person.name = usernameText.text;
//    newPerson.name = usernameText.text;
    
//       ;
    person.personID = [NSNumber numberWithFloat:[phoneText.text floatValue]];
//    newPerson.personID = [NSNumber numberWithFloat:[phoneText.text floatValue]];
    
    /**修改界面显示*/
    //找出一个元素在数组中的下标
    NSInteger index = [self.dataSoure indexOfObject:person];
    
    [self.dataSoure replaceObjectAtIndex:index withObject:person];
    
    //刷新表格
    [self.tablew reloadData];
    
//    NSInteger indexTWo = [[self findAll] indexOfObject:person];
//    Person *persont = [self findAll][indexTWo];
//    persont.name = usernameText.text;
//    persont.personID =  [NSNumber numberWithFloat:[phoneText.text floatValue]];
    
    [self.context save:nil];
    
}
#pragma mark ---滑动删除---

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    // 获取这一行显示的数据
    Person *p = self.dataSoure[indexPath.row];
    
    // 1. 从界面显示删除
    [self.dataSoure removeObject:p];
    [self.tablew reloadData];
    
    // 2. 从本地缓存中删除
    [self.context deleteObject:p];
    [self.context save:nil];
}
- (NSArray *)findAll{
    
    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"Person"];
    return [self.context executeFetchRequest:request error:nil];
    
}
#pragma mark ----懒加载---

- (NSMutableArray *)dataSoure{
    
    if (_dataSoure == nil) {
        _dataSoure = [[NSMutableArray alloc] init];
        [_dataSoure addObjectsFromArray:[self findAll]];
    }
    return _dataSoure;
}

@end

Person类

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>


@interface Person : NSManagedObject

@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * personID;

@end

#import "Person.h"


@implementation Person

@dynamic name;
@dynamic personID;

@end

coreData案列1.png

coreData案列2.png
coreData数据库简单项目案列1.png

coreData数据库简单项目案列2.png