iOS UITableView配合block 回调实现列表删除教

作者: xq9527 | 来源:发表于2021-02-10 17:11 被阅读0次

前言:

各位同学大家好，有段时间没有给大家更新文章了。具体多久我也记不清楚了，春节放假比较早，所以就趁着有时间学习了一下iOS开发的基础知识今天讲的iOS UITableView 配和block 回调实现列表删除教程。那么废话不多说，我们正式开始。

准备工作

安装xcode 这个大家可以自己去appstore 搜索下载安装即可

效果图

QQ20210210-160354-HD[00_00_00--00_00_08].gif

具体实现

列表显示

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource,GTNotmalTableViewDelegate>
@property(nonatomic,strong,readwrite)UITableView * tableview;
@property(nonatomic,strong,readwrite)NSMutableArray * dataArray;
@end
@implementation ViewController
- (instancetype)init{
    self= [super init];
    if(self){
        _dataArray=@[].mutableCopy;
        for(int i=0; i<20;i++){
            [_dataArray addObject:@(i)];
        } 
    }
    return  self;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor= [UIColor whiteColor];
    _tableview= [[UITableView alloc]initWithFrame:self.view.bounds];
    _tableview.dataSource=self;
    _tableview.delegate=self;
    [self.view addSubview:_tableview];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return 110 ;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSLog(@"%ld", indexPath.row)
    
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return _dataArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
  //UItableview cell 复用机制
    GTNormalTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"id"];
    if(!cell){
    cell =[[GTNormalTableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle
                                reuseIdentifier:@"id"];
        cell.deledate=self;
    }
    [cell layoutTableViewCell];
    return  cell;
}
- (void) tableviewCell:(UITableViewCell *)tabviewCell clickDeleteButton:(UIButton * )deletebutton{
    NSLog(@"clickDeleteButton");
    GTDeleteCellView * deleteview =[[GTDeleteCellView alloc] initWithFrame:self.view.bounds];
    CGRect  rect =[tabviewCell  convertRect:deletebutton.frame  toView:nil];
    __weak typeof(self)wself= self;
    [deleteview showDeleteViewFromPoint:rect.origin clickBlock:^{
        __strong typeof  (self)strongSelf=wself;
        [strongSelf.dataArray removeLastObject];
        NSLog(@"clickBlock  回调");
        [self.tableview deleteRowsAtIndexPaths:@[[strongSelf.tableview indexPathForCell:tabviewCell]]
                              withRowAnimation:UITableViewRowAnimationAutomatic];
    
    } ];

}
@end

我们这边调用系统的 UITableView 组件实例化然后添加自定义的cell 来实现整个列表的展示

添加自定义的cell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
  //UItableview cell 复用机制
    GTNormalTableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"id"];
    if(!cell){
    cell =[[GTNormalTableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle
                                reuseIdentifier:@"id"];
        cell.deledate=self;
    }
    [cell  layoutTableViewCell];
    return  cell;
}

自定义 cell 内容

//
//  GTNormalTableViewCell.m
//  shop
//
//  Created by xuqing on 2021/1/27.
//  Copyright © 2021 xuqing. All rights reserved.
//
#import "GTNormalTableViewCell.h"
@interface GTNormalTableViewCell()
@property(nonatomic,strong,readwrite)UILabel * titleLable;
@property(nonatomic,strong,readwrite)UILabel * sourceLable;
@property(nonatomic,strong,readwrite)UILabel * commentLable;
@property(nonatomic,strong,readwrite)UILabel * timeLable;
@property(nonatomic,strong,readwrite)UIImageView *richtimageview;
@property(nonatomic,strong,readwrite)UIButton* deletebutton;
@end

@implementation GTNormalTableViewCell
- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(nullable NSString *)
      reuseIdentifier {
    self=[super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if(self){
        [self.contentView addSubview:({
            self.titleLable=[[UILabel alloc]initWithFrame:CGRectMake(20, 15, 300, 50)];
           // self.titleLable.backgroundColor=[UIColor redColor];
            self.titleLable;
        })];
        [self.contentView addSubview:({
            self.sourceLable=[[UILabel alloc]initWithFrame:CGRectMake(20, 80, 50, 20)];
          //  self.sourceLable.backgroundColor=[UIColor redColor];
            self.sourceLable;


        })];
        [self.contentView addSubview:({
            self.commentLable=[[UILabel alloc]initWithFrame:CGRectMake(100 ,80, 50, 20)];
           // self.commentLable.backgroundColor=[UIColor redColor];
            self.commentLable;
        })];


        [self.contentView addSubview:({
            self.timeLable=[[UILabel alloc]initWithFrame:CGRectMake(150, 80, 50, 20)];
          //  self.timeLable.backgroundColor=[UIColor redColor];
            self.timeLable;
        })];
        
        
        [self.contentView addSubview:({
            self.richtimageview=[[UIImageView alloc]initWithFrame:CGRectMake(330, 15, 70, 70)];
            self.richtimageview.backgroundColor=[UIColor redColor];
            self.richtimageview;
        })];
        
        
        [self.contentView addSubview:({
            self.deletebutton=[[UIButton alloc]initWithFrame:CGRectMake(290, 80, 30,20)];
            self.deletebutton.backgroundColor=[UIColor blueColor];
            [self.deletebutton setTitle:@"X" forState:UIControlStateNormal];
            [self.deletebutton setTitle:@"V" forState:UIControlStateHighlighted];
            [self.deletebutton addTarget:self action:@selector(deletebuttonClick) forControlEvents:UIControlEventTouchUpInside];
            
            self.deletebutton;
        })];
    
    }
    return  self;
}


- (void)layoutTableViewCell{
    self.titleLable.text=@"极客时间iOS开发";
    self.sourceLable.text=@"极客时间";
    [self.sourceLable sizeToFit];

    self.commentLable.text=@"1999评论";
    [self.commentLable sizeToFit];
    self.commentLable.frame= CGRectMake(self.sourceLable.frame.origin.x+self.commentLable.frame.size.width+15,
                                        self.commentLable.frame.origin.y,   self.commentLable.frame.size.width, self.commentLable.frame.size.height);
    self.timeLable.text=@"三分钟前";
    [self.timeLable sizeToFit];
    self.timeLable.frame= CGRectMake(self.commentLable.frame.origin.x+self.commentLable.frame.size.width+15,
                                     self.timeLable.frame.origin.y,   self.timeLable.frame.size.width, self.timeLable.frame.size.height);
}
- (void)deletebuttonClick{
    NSLog(@"deletebuttonClick");
    if(self.deledate &&[self.deledate respondsToSelector:@selector(tableviewCell:clickDeleteButton:)]){
        [self.deledate tableviewCell:self clickDeleteButton:self.deletebutton];
    }
}
@end

为我们的删除按钮添加点击onClick 事件

[self.deletebutton addTarget:self action:@selector(deletebuttonClick) forControlEvents:UIControlEventTouchUpInside];

具体点击事件

- (void)deletebuttonClick{
    NSLog(@"deletebuttonClick");
    if(self.deledate &&[self.deledate respondsToSelector:@selector(tableviewCell:clickDeleteButton:)]){
        [self.deledate tableviewCell:self clickDeleteButton:self.deletebutton];
    }
}

我们在cell子布局里面的删除按钮的点击事件调用了 clickDeleteButton 方法

@protocol GTNotmalTableViewDelegate <NSObject>
- (void) tableviewCell:(UITableViewCell *)tabviewCell clickDeleteButton:(UIButton * )deletebutton;
@end

然后我们在ViewController 中实现clickDeleteButton 方法

- (void) tableviewCell:(UITableViewCell *)tabviewCell clickDeleteButton:(UIButton * )deletebutton{
    NSLog(@"clickDeleteButton");
    GTDeleteCellView * deleteview =[[GTDeleteCellView alloc] initWithFrame:self.view.bounds];
    CGRect  rect =[tabviewCell  convertRect:deletebutton.frame  toView:nil];
    __weak typeof(self)wself= self;
    [deleteview showDeleteViewFromPoint:rect.origin clickBlock:^{
        __strong typeof  (self)strongSelf=wself;
        [strongSelf.dataArray removeLastObject];
        NSLog(@"clickBlock  回调");
        [self.tableview deleteRowsAtIndexPaths:@[[strongSelf.tableview indexPathForCell:tabviewCell]]
                              withRowAnimation:UITableViewRowAnimationAutomatic];
    } ];
}

我们在 clickDeleteButton 方法中初始化GTDeleteCellView 并显示

弹出 GTDeleteCellView 具体实现

- (instancetype) initWithFrame:(CGRect)frame{
    
    self= [super initWithFrame:frame];
    if(self){
        
       [self addSubview:({
           _backgroundView=[[UIView alloc]initWithFrame:self.bounds];
           _backgroundView.backgroundColor=[UIColor blackColor];
           _backgroundView.alpha=0.5;
           [_backgroundView addGestureRecognizer:({
               UITapGestureRecognizer * tapGesture= [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(dismissDeleteView)];
               tapGesture;
           })];
           _backgroundView;
       })];
        [self addSubview:({
            _deleteButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
            _deleteButton.titleLabel.textColor = [UIColor whiteColor];
            _deleteButton.titleLabel.text=@"删除";
            [_deleteButton addTarget:self action:@selector(_clickButton) forControlEvents:UIControlEventTouchUpInside];
            _deleteButton.backgroundColor=[UIColor redColor];
           _deleteButton;
        })];
    }
    return  self;
}

GTDeleteCellView 的显示和关闭

显示

-(void)showDeleteViewFromPoint:(CGPoint)point  clickBlock:(dispatch_block_t)clickBlock{
    _deleteButton.frame=CGRectMake(point.x, point.y, 0, 0);
    _deleteBlock=[clickBlock copy];
    UIWindow *window =  [[[UIApplication sharedApplication] windows] objectAtIndex:0];
    [window addSubview:self];
  //  [[UIApplication sharedApplication].keyWindow addSubview:self];
//   [UIView animateWithDuration:1.f animations:^{
//       self.deleteButton.frame=CGRectMake((self.bounds.size.width-200)/2 , (self.bounds.size.height-200)/2, 200, 200);
//   }];
//
    [UIView animateWithDuration:1.f delay:0.f usingSpringWithDamping:0.5  initialSpringVelocity:0.5 options:UIViewAnimationCurveEaseInOut
                     animations:^{
     self.deleteButton.frame=CGRectMake((self.bounds.size.width-200)/2 , (self.bounds.size.height-200)/2, 200, 200);
 }completion:^(BOOL finished){
  
     NSLog(@"completion");
   
 }];
  
}

showDeleteViewFromPoint 方法需要外部传入 CGPoint 和block 的回调实现然后showDeleteViewFromPoint 方法里面我们处理 GTDeleteCellView 弹出的的动画效果

动画

 [UIView animateWithDuration:1.f delay:0.f usingSpringWithDamping:0.5  initialSpringVelocity:0.5 options:UIViewAnimationCurveEaseInOut
                     animations:^{
     self.deleteButton.frame=CGRectMake((self.bounds.size.width-200)/2 , (self.bounds.size.height-200)/2, 200, 200);
 }completion:^(BOOL finished){
     NSLog(@"completion")；
 }];

实例化block 和point

    _deleteButton.frame=CGRectMake(point.x, point.y, 0, 0);
    _deleteBlock=[clickBlock copy];
    UIWindow *window =  [[[UIApplication sharedApplication] windows] objectAtIndex:0];
    [window addSubview:self];

关闭

-(void)dismissDeleteView{
    [self removeFromSuperview];
}

这是点空白的地方关闭
我们给deletebutton 添加点击事件

  [_deleteButton addTarget:self action:@selector(_clickButton) forControlEvents:UIControlEventTouchUpInside];

我们在点击事件方法实现里面调用 block和 removeFromSuperview

-(void)_clickButton{
 //   _deleteBlock();
    if(_deleteBlock){
        _deleteBlock();
        NSLog(@"block回调执行");
    }
    [self removeFromSuperview];
}

这样我们的deletebutton点击就也会关闭 GTDeleteCellView
然后我们在 ViewController 中将block 的会回调实现并且删除dataArray数组里面的数据更新列表

CGRect  rect =[tabviewCell  convertRect:deletebutton.frame  toView:nil];
    __weak typeof(self)wself= self;
    [deleteview showDeleteViewFromPoint:rect.origin clickBlock:^{
        __strong typeof  (self)strongSelf=wself;
        [strongSelf.dataArray removeLastObject];
        NSLog(@"clickBlock  回调");
        [self.tableview deleteRowsAtIndexPaths:@[[strongSelf.tableview indexPathForCell:tabviewCell]]
                              withRowAnimation:UITableViewRowAnimationAutomatic];
    
    } ];

我们调用 GTDeleteCellView 中的showDeleteViewFromPoint 方法传入我们转换后的point 和block 的实现
最后我们调用

 [strongSelf.dataArray removeLastObject];

删除数组里面的数据然后调用 deleteRowsAtIndexPaths删除并刷新列表

 [self.tableview deleteRowsAtIndexPaths:@[[strongSelf.tableview indexPathForCell:tabviewCell]]
                              withRowAnimation:UITableViewRowAnimationAutomatic];

到此iOS UITableView配合block 回调实现列表删除教程就讲完了

最后总结

在iOS开发中这种列表展示基本都是使用 UITableView 和UICollectionView 我这边只是加单举例所以直接就用UITableView 实现了我们要注意的是block回调使用和动画的处理以及自定义cell的处理就差不多了，我是一名安卓程序员因为需要就来学习一下iOS的开发, 最近看了一下教程学习了IOS里面的一些基础控件的用法。就想着做个笔记所以就写了这篇文章，记录一下如果有错误的请大神们指出。最后希望我的文章能帮助到各位解决问题，以后我还会贡献更多有用的代码分享给大家。各位同学如果觉得文章还不错，麻烦给关注和star，小弟在这里谢过啦

iOS UITableView配合block 回调实现列表删除教

前言:

准备工作

效果图

具体实现

GTDeleteCellView 的显示和关闭

显示

关闭

最后总结

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