UITableViewCell UITapGestureRecognizer 没有响应

UITableViewCell UITapGestureRecognizer not responding

我是 Objective-C 的初学者,我正在研究现有的代码库。

在下面的代码中,UITapGestureRecognizer 似乎没有触发点击方法。我试过添加

[self setUserInteractionEnabled:YES];

任何人都可以帮我找出这里不起作用的地方。

这是我的 UITableViewCell 实现 class:

@interface ELCAssetCell ()

@property(nonatomic, strong) NSArray * rowAssets;
@property(nonatomic, strong) NSMutableArray * rowViews;

@end

@implementation ELCAssetCell

@synthesize rowAssets;

- (id)initWithReuseIdentifier:(NSString *)_identifier cellWidth:(CGFloat)width {

 if (self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:_identifier]) {

    self.rowViews = [[NSMutableArray alloc] init];

    for (int i = 0; i < 4; i++) {
        [self.rowViews addObject:[[AssetView alloc] initWithFrame:CGRectZero]];
    }

    for (AssetView * view in self.rowViews) {
        [self addSubview:view];
    }

    _width = width;
 }

return self;
}

- (void)layoutSubviews {

  [super layoutSubviews];
  CGFloat itemWidth = _width / 4;
  CGRect frame = CGRectMake(2, 2, itemWidth - 4, itemWidth - 4);

  for (AssetView * view in self.rowViews) {

      [view setFrame:frame];
      [[view gestureRecognizers] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL 
       *stop) {
           [view removeGestureRecognizer:obj];
          }];
      [view addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self 
      action:@selector(tap:)]];

    frame.origin.x += itemWidth;
  }
 }

 - (void)tap:(UITapGestureRecognizer *)gest {

     [self.delegate assetPressed:[(AssetView *)[gest view] asset]];
     [(AssetView *)[gest view] toggleSelection];
   }


  @end

最有可能的问题是您将视图添加到单元格本身——它们应该添加到单元格的 contentView

变化:

for (AssetView * view in self.rowViews) {
    [self addSubview:view];
}

至:

for (AssetView * view in self.rowViews) {
    [self.contentView addSubview:view];
}

除此之外,这看起来非常糟糕!

  • 你应该使用自动布局而不是设置框架
  • layoutSubviews 可以多次调用...您应该在创建视图时添加 UITapGestureRecognizer,而不是每次调用 layoutSubviews 时都删除/重新添加。