IOS UITableViewCell詳解及按鈕點擊事件處理

今天突然做項目的時候，又遇到處理自定義的UITableViewCell上按鈕的點擊事件問題。我知道有兩種方式，可是突然想不起來之前是怎麼做的了，好記性不如爛筆頭，還是記錄一下吧。

1、第一種方式給Button加上tag值

這裡分為兩種：一種是直接在原生的UITableViewCell上添加UIButton按鈕，然後給UIButton設置tag值，然後在控制器裡的方法裡通過取數據，做界面跳轉等。還是舉個例子吧，省的回憶半天。

- (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; 
} 

然後在點擊事件中取數據，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]; 
   
} 

以上兩個方法都是在同一個控制器中。

2、自定義了UITableViewCell，那麼就在UITableViewCell裡添加一個代理方法。

#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 

然後再控制器中實現Cell的代理方法即可

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

當然，這裡也可以做界面跳轉，取數據依然用button的tag值。

補充：這裡還可以在代理方法中將cell本身傳回去，這樣不用從數組取數據，直接利用cell的數據對象，更簡單吆。

3、是直接在自定義的Cell裡面跳轉，這種耦合性比較強。思路先是找到button的父控制器，然後做界面跳轉或者其他操作。有這樣一個工具方法

#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; 
} 

頭文件就不寫了，很簡單的擴展。

- (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]; 
  }; 
   
} 

這裡是給Cell賦值model,然後點擊事件是用Block實現的。

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