IOS UITableViewCell详解及按钮点击事件处理
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。
2、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 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。
补充：这里还可以在代理方法中将cell本身传回去，这样不用从数组取数据，直接利用cell的数据对象，更简单吆。
3、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。
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