UITableViewCell上的按钮点击事件处理

今天突然做项目的时候，又遇到处理自定义的UITableViewCell上按钮的点击事件问题。我知道有两种方式，可是突然想不起来之前是怎么做的了，好记性不如烂笔头，还是记录一下吧。

1、第一种方式给Button加上tag值

这里分为两种：一种是直接在原生的UITableViewCell上添加UIButton按钮，然后给UIButton设置tag值，然后在控制器里的方法里通过取数据，做界面跳转等。还是举个例子吧，省的回忆半天。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    static NSString *identifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier];
    if (cell == nil) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
     User *user = _users[indexPath.row];
    cell.user = user;
    //拍照button
    UIButton  *photographButton = [UIButton buttonWithType:UIButtonTypeCustom];
    photographButton.frame = CGRectMake(221 , 10, 100, 44);
    [photographButton setImage:[UIImage imageNamed:@"camera.png"] forState:UIControlStateNormal];
    [photographButton addTarget:self action:@selector(photographButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
    photographButton.tag = indexPath.row;
    [cell.contentView addSubview:photographButton];
    
    return cell;
}

然后在点击事件中取数据，加信息 

- (void)photographButtonClicked:(UIButton *)sender{
     User *user = _users[sender.tag];
    PhotoPickerController *photoPicker = [[PhotoPickerController alloc] init];
    photoPicker.user = user;
    [self.navigationController pushViewController:photoPicker animated:YES];
    
}

以上两个方法都是在同一个控制器中。 

另外一种，自定义了UITableViewCell，那么就在UITableViewCell里添加一个代理方法。

#import <UIKit/UIKit.h>

@protocol TermCellDelegate <NSObject>

- (void)choseTerm:(UIButton *)button;

@end

@interface TermCell : UITableViewCell

@property (retain, nonatomic) IBOutlet UIButton *checkButton;
@property (retain, nonatomic) IBOutlet UILabel *termLabel;

@property (assign, nonatomic) BOOL  isChecked;
@property (assign, nonatomic) id<TermCellDelegate> delegate;

- (IBAction)checkAction:(UIButton *)sender;

@end

#import "TermCell.h"

@implementation TermCell

- (void)awakeFromNib
{
    // Initialization code
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    if (_isChecked) {
        [_checkButton setBackgroundImage:[UIImage imageNamed:@"task_state_checked"] forState:UIControlStateNormal];
    } else {
        [_checkButton setBackgroundImage:[UIImage imageNamed:@"task_state_unchecked"] forState:UIControlStateNormal];
    }
}

- (void)dealloc {
    [_checkButton release];
    [_termLabel release];
    [super dealloc];
}

- (IBAction)checkAction:(UIButton *)sender {
    if ([_delegate respondsToSelector:@selector(choseTerm:)]) {
        sender.tag = self.tag;
        [_delegate choseTerm:sender];
    }
}

@end

然后再控制器中实现Cell的代理方法即可 

#pragma mark - TermCellDelegate
- (void)choseTerm:(UIButton *)button
{
    _clickIndex = button.tag;
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"确定修改学期吗？" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
    [alertView show];
}

当然，这里也可以做界面跳转，取数据依然用button的tag值。 

第二种，是直接在自定义的Cell里面跳转，这种耦合性比较强。思路先是找到button的父控制器，然后做界面跳转或者其他操作。有这样一个工具方法

#import "UIView+Additions.h"

@implementation UIView (Additions)

- (UIViewController *)viewController
{
    UIResponder *next = [self nextResponder];
    do {
        if ([next isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)next;
        }
        
        next = [next nextResponder];
        
    } while (next != nil);
    
    
    return nil;
}

头文件就不写了，很简单的扩展。 

- (void)setWeiboModel:(WeiboModel *)weiboModel
{
    if (_weiboModel != weiboModel) {
        [_weiboModel release];
        _weiboModel = [weiboModel retain];
    }
    
    __block WeiboCell *this = self;
    _userImage.touchBlock = ^{
        NSString *nickName = this.weiboModel.user.screen_name;
        UserViewController *userCtrl = [[UserViewController alloc] init];
        userCtrl.userName = nickName;
        [this.viewController.navigationController pushViewController:userCtrl animated:YES];
        [userCtrl release];
    };
    
}

这里是给Cell赋值model,然后点击事件是用Block实现的。