ios - 将 UILongPressGestureRecognizer 添加到自定义 UITableViewCell 中的 UIButton

Question

我有一个带有各种 IBOutlets 的自定义单元格，但我想在一个按钮上添加一个 UILongPressGestureRecognizer 用于长按手势。这是我的代码(顺便说一句， socket 连接正确，按钮的 IBAction 方法被正确调用):

MyCustomCell.h

@interface MyCustomCell : UITableViewCell
@property (strong, nonatomic) IBOutlet UIButton *myButton;
@property (strong, nonatomic) UILongPressGestureRecognizer *longPressGestureRecognizer;
@end

MyCustomCell.m

- (void)awakeFromNib
{
    // Initialization code
    self.longPressGestureRecognizer = nil;
}

MyViewController.m

#import MyCustomCell.h

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier = @"MyCell";
    MyCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier forIndexPath:indexPath];
    if (!cell){
        cell = [[MyCustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }

    cell.longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPressGestures:)];
    cell.longPressGestureRecognizer.minimumPressDuration = 1.0f;
    cell.longPressGestureRecognizer.allowableMovement = 300.0f;
    [cell.myButton addGestureRecognizer:cell.longPressGestureRecognizer];
}

- (void)handleLongPressGestures:(UIGestureRecognizer *)recognizer
{
    if ([recognizer.view isKindOfClass:[UIButton class]]){
        if (recognizer.state == UIGestureRecognizerStateBegan){
            NSLog(@"Long press began");
        } else if (recognizer.state = UIGestureRecognizerStateEnded){
            NSLog(@"Long press ended");
        }
    }
}

问题是 handleLongPressGestures: 方法从未被调用。

Answer 1

longPressGestureRecognizer 应该是 Controller 的属性，而不是 View (MyCustomCell)。将属性移至 MyViewController 并重试。我的猜测是当它对 MyCustomCell 进行排队和出队时发生了一些奇怪的事情。

重用的对象(单元)应该是轻量级的。在这种情况下，longPressGestureRecognizer 的目标是 View Controller 并且很讨厌。