Objective c - 为自定义 UITableViewCell 的按钮处理按钮触摸事件的最佳实践-移动开发问题

Objective c - Best practice to handle a button touch event for a button of a custom UITableViewCell(Objective c - 为自定义 UITableViewCell 的按钮处理按钮触摸事件的最佳实践)

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问题描述

为自定义 UITableViewCell 的按钮处理按钮触摸事件的最佳做法是什么?

What is best practice to handle a button touch event for a button of a custom UITableViewCell?

我的课程:MyViewController, MyCustomCell

我能想到三个选项:

第一个选项- 将按钮作为 MyCustomCell 的属性，然后在 MyViewController .m 文件中为其添加目标MyViewController 作为目标.

First option- Have the button as a property of MyCustomCell, and then add a target to it in the MyViewController .m file with MyViewController as the target.

MyViewController.m 文件

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"customCell";

    MyCustomCell *cell = (MyCustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
    cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    [cell.theButton addTarget:self
                       action:@selector(theButtonTapped:)
             forControlEvents:UIControlEventTouchUpInside];
    }

    // Configure the cell...    
    [self configureCell:cell atIndexPath:indexPath];

    return cell;
}

- (void)theButtonTapped:(UIButton *)sender
{
    MyCustomCell *selectedCell = (MyCustomCell *)sender.superview;

    if (selectedCell) {
        NSIndexPath *indexPath = [self.tableView indexPathForCell:selectedCell];
        MyModel *selectedModel = [self.model objectAtIndex:indexPath.row]; 

        // do something with the model...
    }
}

第二个选项- 如果自定义单元格是在 IB 中制作的，将 nib File's Owner 设置为 MyViewController，在中实现 buttonTapped: 方法MyViewController 并将按钮的 Touch Up Inside 事件连接到 buttonTapped: 方法.

Second option- If the custom cell was made in IB, Set the nib File's Owner to be MyViewController, implement buttonTapped: method in MyViewController and connect the button's Touch Up Inside event to the buttonTapped: method.

第三个选项-如果自定义单元格不是在 IB 中制作的，请在 MyCustomCell .m 文件中使用 MyCustomCell 作为目标. 定义一个 MyCustomCellDelegate 添加 @property (nonatomic, assign) id;将委托给MyCustomCell，并在点击按钮时调用此委托. 创建单元格时将MyViewController设置为单元格的delegate，实现MyCustomCellDelegate协议.


Third option- if the custom cell wasn't made in IB, add a target to the button in the MyCustomCell .m file with MyCustomCell as the target.

Define a MyCustomCellDelegate add @property (nonatomic, assign) id<MyCustomCellDelegate> delegate to MyCustomCell and call this delegate when button tapped.

Set MyViewController as the cell's delegate when creating cells and implement the MyCustomCellDelegate protocol.
MyCustomCell.h 文件
@class MyCustomCell;  

@protocol MyCustomCellDelegate <NSObject>
- (void)buttonTappedOnCell:(MyCustomCell *)cell;
@end

@interface MyCustomCell : UITableViewCell

@property (nonatomic, retain) UIButton *theButton;
@property (nonatomic, assign) id<MyCustomCellDelegate> delegate;

@end

MyCustomCell.m 文件
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
        self.theButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        self.theButton.frame = CGRectMake(10,10,50,30);
        [self addSubview:self.theButton];

        [self.theButton addTarget:self
                           action:@selector(theButtonTapped:)
                 forControlEvents:UIControlEventTouchUpInside];
    }
    return self;
}

- (void)theButtonTapped:(UIButton *)sender
{
    [self.delegate buttonTappedOnCell:self];
}

MyViewController.m 文件
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"customCell";

    MyCustomCell *cell = (MyCustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

        cell.delegate = self;
    }

    // Configure the cell...    
    [self configureCell:cell atIndexPath:indexPath];

    return cell;
}

- (void)buttonTappedOnCell:(MyCustomCell *)selectedCell
{
    if (selectedCell) {
        NSIndexPath *indexPath = [self.tableView indexPathForCell:selectedCell];
        MyModel *selectedModel = [self.model objectAtIndex:indexPath.row];

        // do something with the model...
    }
}


推荐答案
将单元格的行存储为自定义按钮的 tag 属性.
Store the row of the cell as tag property of your custom button. 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // bla bla bla
    if (!cell)
    {
        //bla bla bla
        [cell.yourButton addTarget:self selector:@selector(yourButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    }
    // bla bla bla
    cell.yourButton.tag = indexPath.row;
}

-(void)yourButtonTapped:(id)sender
{
    int tag = [(UIButton *)sender tag];
    NSLog(@"tapped button in cell at row %i", tag);
}


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