UIButton不会改变选定状态

问题描述：

我想做一个简单的UIButton，每次单击它时都会更改背景图像。这是代码：UIButton不会改变选定状态

UIButton *likeButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[likeButton addTarget:self 
       action:@selector(likeButtonPressed:) 
    forControlEvents:UIControlEventTouchUpInside]; 
[likeButton setBackgroundImage:[UIImage imageNamed:@"icon-like-grey.png"] forState:UIControlStateNormal]; 
[likeButton setBackgroundImage:[UIImage imageNamed:@"icon-dislike-color.png"] forState:UIControlStateSelected];

。

- (IBAction)likeButtonPressed:(UIButton *)sender { 
    if (sender.isSelected) { 
     [sender setSelected:NO]; 
     NSLog(@"not selected"); 
    } else { 
     [sender setSelected:YES]; 
     NSLog(@"selected"); 
    } 
}

显然它第一次被选中，并且按钮从灰色变为彩色。但是，它在第二次点击后不会变回灰色。 NSLog显示正确的代码，所以问题必须在[sender setSelected: ]行。我究竟做错了什么？

编辑：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

static NSString *CellIdentifier = @"Cell"; 

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

if (cell == nil) 
{ 
    NSLog(@"in nil"); 
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
} 

mainDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 

cell.textLabel.text = @"Text"; 
cell.accessoryType = UITableViewCellAccessoryNone; 
cell.selectionStyle = UITableViewCellSelectionStyleNone; 
cell.textLabel.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:18]; 

     if (indexPath.row == 0) { 
      cell.textLabel.textAlignment = NSTextAlignmentCenter; 
      cell.textLabel.text = [NSString stringWithFormat:@"%@", [mainDelegate.imagesDescription objectAtIndex:indexPath.section]]; 

     } else if (indexPath.row == 1) { 
      NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@", [mainDelegate.imagesURL objectAtIndex:indexPath.section]]]; 
      cell.accessoryType = UITableViewCellAccessoryNone; 

      SDWebImageManager *manager = [SDWebImageManager sharedManager]; 
      [manager downloadWithURL:url 
            options:0 
           progress:^(NSUInteger receivedSize, long long expectedSize) { 

           } 
           completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished) { 

            if (image && finished) { 
             cell.imageView.image = image; 
            } 
           } 
      ]; 

      UIButton *likeButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
      [likeButton addTarget:self 
          action:@selector(likeButtonPressed:) 
       forControlEvents:UIControlEventTouchUpInside]; 

      [likeButton setBackgroundImage:[UIImage imageNamed:@"icon-like-grey.png"] forState:UIControlStateNormal]; 
      [likeButton setBackgroundImage:[UIImage imageNamed:@"icon-dislike-color.png"] forState:UIControlStateSelected]; 

      likeButton.frame = CGRectMake(215, 60, 40, 40); 
      likeButton.layer.borderWidth = 0; 
      cell.textLabel.text = @""; 

      [cell addSubview:likeButton]; 


     } else if (indexPath.row == 2) { 

      NSString *location = [mainDelegate.imagesLocation objectAtIndex:indexPath.section]; 
      cell.textLabel.text = location; 

      UILabel *labelRight = [[UILabel alloc] initWithFrame:CGRectMake(0, 200, 100, 100)]; 
      labelRight.textAlignment = NSTextAlignmentRight; 

      labelRight.text = [NSString stringWithFormat:@"%@ %@", [mainDelegate.imagesLikes objectAtIndex:indexPath.section], @"Likes"]; 
      cell.accessoryView = labelRight; 
     } 

return cell; 

}

也许你应该正确的图像设置为按UIControlStateHighlighted状态按下按钮 – kjhkjhkjh 2014-08-27 20:06:03

@ 0Silencer我不明白UIControlStateHighlighted与UIControlStateSelected有什么关系 – alvarolopez 2014-08-27 20:08:28

您的按钮有一个标题？如果不检查这个问题：http://stackoverflow.com/questions/19198858/uibuttons-selected-state-not-working-in-ios7 – 2014-08-27 20:09:19

答

你的每一个细胞被离队时添加子视图为您喜欢按钮，而不仅仅是更新按钮的状态。在这种情况下，一个好的做法是将UITableViewCell类继承并初始化它，从tableView:cellForRowAtIndexPath:更新按钮的状态。虽然这会要求您将按钮状态存储为数据源（并在您的likeButtonPressed:方法中更新它们）。

这是一个不错的方法。谢谢。 – alvarolopez 2014-08-28 20:23:48

UIButton不会改变选定状态

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