ios - UITapGestureRecognizer 阻止 subview 中 UIButton 的触摸事件

Question

我相信我在使用 UITapGestureRecognizer 时遇到问题，因为在聊天室区域中点击时会关闭键盘，从而阻止或阻止触摸 previewCancelButton。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 正确地位于 stickerPreviewView 的右上角，但无法接收到它的触摸事件。当我触摸按钮时，它在控制台中显示“111”，当我回溯时，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找到一些解决方案。那将不胜感激。提前致谢。

进展:我修改了 ChatroomVC.m 中的 gestureRecognizer 方法，因此现在它可以忽略按钮上的点击手势，但问题仍然是按钮的 Action 没有被触发。

Answer 1

试试这个，我想它会起作用。使用手势的shouldReceiveTouch委托(delegate)方法，touch.view为按钮类时返回NO。因此，当它找到按钮时，它将丢弃手势并执行按钮操作。

- (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;
}

这是演示实现:我已经在 Storyboard中的 View Controller 的主视图上获取了按钮。

- (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");
}

希望对您有所帮助。快乐的编码......