保存按下按钮状态UITableViewCell

Question

我已经UITableView动态单元格和单元格是自定义UITableViewCell子类的对象。 每个单元包含UILabel,UIImageView和UIButton这个UIImageView。为了清楚起见，它是播放音频流的音乐播放器。我的问题是保存按下按钮状态，例如，当我的UITableView第一次加载所有按钮处于“取消选择”状态，每个按钮都有“play.png”作为图像时，如果我按下此按钮，它的图像将变为“pause.png “并且改变目标。这是非常明显的，但如果我将向上或向下滚动我的UITableView，即使我从未按下这些按钮，我也会看到带有“暂停”按钮的单元格。我知道我必须保存NSMutableArray中的单元格按钮，我已经这样做了，但我猜我错了。请帮我解决这个典型问题。

我来源：

播放/暂停切换方法：

-(void)selectSettings:(AVMPlayButton *)sender{ 

CGPoint pointInTable = [sender convertPoint:sender.bounds.origin toView:musicTable]; 
NSIndexPath *indexPath = [musicTable indexPathForRowAtPoint:pointInTable]; 
AVMMusicCell *cell=(AVMMusicCell *)[musicTable cellForRowAtIndexPath:indexPath]; 

NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row]; 
[sender setSelected:!sender.isSelected]; 

if (sender.isSelected) { 
    NSLog(@"SELECTED!"); 

    if (![selectedButonsToPlay containsObject:[NSString stringWithFormat:@"%@",rowNsNum]] ) // HERE IS ARRAY WHICH CONTAINS SELECTED BUTTONS 
    { 
     [selectedButonsToPlay addObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]]; 
     [sender addTarget:self action:@selector(pausePlay:) forControlEvents:UIControlEventTouchUpInside]; 
     UIImage *pauseBackground = [UIImage imageNamed:@"pause.png"]; 
     [sender setImage:pauseBackground forState:UIControlStateSelected]; 
    } 

}else { 
    NSLog(@"DESELECTED!"); 
    if ([selectedButonsToPlay containsObject:[NSString stringWithFormat:@"%@",rowNsNum]] ) 
    { 
     [selectedButonsToPlay removeObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]]; 
     // [cell.playButton addTarget:self action:@selector(startPlay:) forControlEvents:UIControlEventTouchUpInside]; 
     NSLog(@"DEselected in didDEselect"); 
     } 
    } 

NSLog(@"you just select button"); 
} 


-(IBAction)pausePlay:(AVMPlayButton*)sender{ 
AVMPlayButton *settings = (AVMPlayButton *)sender; 
CGPoint pointInTable = [settings convertPoint:settings.bounds.origin toView:musicTable]; 
NSIndexPath *indexPath = [musicTable indexPathForRowAtPoint:pointInTable]; 
AVMMusicCell *cell=(AVMMusicCell *)[musicTable cellForRowAtIndexPath:indexPath]; 
UIImage *playBackground = [UIImage imageNamed:@"play.png"]; 
[cell.playButton setImage:playBackground forState:UIControlStateNormal]; 
[self pauseStream]; 

} 

的cellForRowAtIndexPath方法：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"fileCell"; 
    AVMMusicCell *cell = [self.musicTable dequeueReusableCellWithIdentifier:CellIdentifier]; 
if (cell == nil) { 
    cell = [[AVMMusicCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
} 

AVMDataStore *oneItem = [musicArray objectAtIndex:indexPath.row]; 
oneItem = [musicArray objectAtIndex:indexPath.row]; 


[cell setMusic:oneItem]; 
cell.songName.text = oneItem.fileName; 
UIView *bgColorView = [[UIView alloc] init]; 
bgColorView.backgroundColor = MINT; 
[cell setSelectedBackgroundView:bgColorView]; 

[cell.playButton addTarget:self action:@selector(selectSettings:) forControlEvents:UIControlEventTouchUpInside]; 

//save cell state for selected CELLS 
NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row]; 

UIImage *pauseBackground = [UIImage imageNamed:@"pause.png"]; 
UIImage *playBackground = [UIImage imageNamed:@"play.png"]; 
if ([selectedButonsToPlay containsObject:[NSString stringWithFormat:@"%@",rowNsNum]] ) 
{ 
    NSLog(@"cellforrow %lu contains selected buttons!",indexPath.row); 
    // NSLog(@"picture in cell %lu button is %@",indexPath.row,cell.playButton.imageView.image); 
    // [cell.playButton removeTarget:self action:@selector(selectSettings:) forControlEvents:UIControlEventTouchUpInside]; 
    [cell.playButton addTarget:self action:@selector(pausePlay:) forControlEvents:UIControlEventTouchUpInside]; 

    [cell.playButton setImage:pauseBackground forState:UIControlStateSelected]; 
} 
else{ 
    NSLog(@"cell %lu does not contain selected buton",indexPath.row); 
    [cell.playButton addTarget:self action:@selector(startPlay:) forControlEvents:UIControlEventTouchUpInside]; 
     [cell.playButton setImage:playBackground forState:UIControlStateNormal]; 
} 


return cell; 


} 

它的样子：

当没有一个按钮被按下：

按下播放按钮，它的确定

向下滚动，看到在第四小区后 “玩”按钮也被按下（但实际上不是）

向上滚动，看到选择的按钮状态移动对细胞附近“玩”真的按下

Answer 1

你非常接近。问题在于单元格被重用并且按钮的状态可能不会被选中。由于暂停图像仅在选中时才显示，因此您只需确保已选中该按钮即可。您还需要确保在需要时取消选择。希望能解决这个问题。

if ([selectedButonsToPlay containsObject:[NSString stringWithFormat:@"%@",rowNsNum]] ) 
{ 
    NSLog(@"cellforrow %lu contains selected buttons!",indexPath.row); 
    // NSLog(@"picture in cell %lu button is %@",indexPath.row,cell.playButton.imageView.image); 
    // [cell.playButton removeTarget:self action:@selector(selectSettings:) forControlEvents:UIControlEventTouchUpInside]; 
    [cell.playButton addTarget:self action:@selector(pausePlay:) forControlEvents:UIControlEventTouchUpInside]; 

    [cell.playButton setImage:pauseBackground forState:UIControlStateSelected]; 

    [cell.playButton setSelected:YES]; 
} 
else{ 
    NSLog(@"cell %lu does not contain selected buton",indexPath.row); 
    [cell.playButton addTarget:self action:@selector(startPlay:) forControlEvents:UIControlEventTouchUpInside]; 
    [cell.playButton setImage:playBackground forState:UIControlStateNormal]; 

    [cell.playButton setSelected:NO]; 

}