UITapGestureRecognizer在子视图中阻止UIButton的触摸事件

Question

我相信UITapGestureRecognizer在点击聊天室区域时会解除键盘问题，阻止或阻止对previewCancelButton的触摸。以下是我的相关代码：

BaseTemplateVC.m

- (void)addDismissKeyboardGesture {

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard:)];
    tapGesture.cancelsTouchesInView = NO;
    tapGesture.delegate = self;
    self.view.tag = 111;
    [self.view addGestureRecognizer:tapGesture];
}

- (void) dismissKeyboard:(id)sender {
    UITapGestureRecognizer *gesture = sender;
    UIView *view = gesture.view;
    NSLog(@"%ld", (long)view.tag);
    [self.view endEditing:YES];
}

ChatroomVC.m

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{

    //Disallow recognition of tap gestures in the segmented control.
    if (([touch.view isKindOfClass:[UIButton class]])) {
        NSLog(@"noooooooo");
        return NO;
    }
    return YES;
    NSLog(@"yesssssss"); 
}

InputFunctionView.m

- (void)selectedSticker:(NSString *)stickerURLString {

    /* Sticker preview subview */
    stickerPreviewView = [[UIImageView alloc] initWithFrame:CGRectMake(0, -120, FrameWidth, 120)];
    stickerPreviewView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5f];
    stickerPreviewView.userInteractionEnabled = YES;
    [self addSubview:stickerPreviewView];
    [self bringSubviewToFront:stickerPreviewView];

    /* Initialise previewCancelButton */
    self.previewCancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
    self.previewCancelButton.frame = CGRectMake(Main_Screen_Width-30, SpaceForItems-120, 20, 20);
    [self.previewCancelButton setBackgroundImage:[UIImage imageNamed:@"btn_previewcancel.png"] forState:UIControlStateNormal];
    [self.previewCancelButton setBackgroundImage:[UIImage imageNamed:@"btn_previewcancel.png"] forState:UIControlStateHighlighted];

    [self.previewCancelButton addTarget:self action:@selector(cancelStickerPreviewButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

    [self addSubview: self.previewCancelButton];

}

/* Cancel sticker preview subview */
- (void)cancelStickerPreviewButtonPressed:(id)sender {

    NSLog(@"cancel sticker preview");
    [self.previewCancelButton removeFromSuperview];
    [stickerPreviewView removeFromSuperview];

}

现在，previewCancelButton正确位于stickerPreviewView的右上角，但无法接收触摸事件。当我触摸按钮时，它会显示＆＃34; 111＆＃34;在控制台中，当我追溯到后，我发现BaseTemplateVC.m包含addDismissKeyboardGesture方法，所以我相信这可能会导致问题。

任何人都可以指导我一些解决方案。真的很感激。提前致谢。

进度：我已经在ChatroomVC.m中修改了gestureRecognizer方法，所以现在它可以忽略按钮上的点击手势，但问题仍然是按钮没有被触发的操作。

Answer 1

试试这个，我想它会起作用。 当 touch.view 是按钮类时，使用shouldReceiveTouch代理手势方法，返回否。 所以当它找到按钮时它将丢弃手势并采取按钮动作。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    // Block the recognition of tap gestures in the button.
    if (([touch.view isKindOfClass:[UIButton class]])) {
       return NO;
    }

    return YES;
}

以下是演示实施： 我在故事板上的视图控制器主视图上按下了按钮。

- (void)viewDidLoad {
    [super viewDidLoad];

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureClicked:)];
    tapGesture.delegate = self;
    [self.view addGestureRecognizer:tapGesture];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

    // Disallow recognition of tap gestures in the segmented control.
    if (([touch.view isKindOfClass:[UIButton class]])) {
        return NO;
    }
    return YES;
}
- (IBAction)btnTestClicked:(UIButton *)sender {
    NSLog(@"test button click");
}

- (void)tapGestureClicked:(UIGestureRecognizer *)recog
{
    NSLog(@"tap gesture clicked");
}

希望它有所帮助。 快乐的编码...

Answer 2

我通过在GestureRecogniser委托方法中使用以下代码找到了解决方法：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
  if ([touch.view isDescendantOfView:IFView.stickerPreviewView]) {
     return NO;
  }
     return YES;
}

它确切地指定了IFView.stickerPreviewView返回NO的子视图。同样在InputFunctionView中，使用它来添加子视图：

[self.superview addSubview:_stickerPreviewView];