Question

在我的应用程序中，想要识别单击并双击View。我的实际问题是双击视图时单击也发生了。单击即可完美运行。所以如何识别单击并双击视图？

我的代码是：

- (void)viewDidLoad
{
   [super viewDidLoad];
   [self fullscreenGallery];
   [self video_image_Gallery];
}
-(void)video_image_Gallery
{
   UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
   doubleTap.numberOfTapsRequired = 2;
   doubleTap.delegate = self;
   [image_scroll addGestureRecognizer:doubleTap];
}
- (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer 
{
   [self performSelector:@selector(fullscreenGallery) withObject:nil afterDelay:3];
   UIScrollView * imageScroll = (UIScrollView *)gestureRecognizer.view;
   self.header_view.hidden=NO;
   float newScale = [imageScroll zoomScale] + ZOOM_STEP;
   if (newScale > imageScroll.maximumZoomScale)
   {
      newScale = imageScroll.minimumZoomScale;
      CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
      [imageScroll zoomToRect:zoomRect animated:YES];
   }
   else
   {
      self.header_view.hidden=YES;
      newScale = imageScroll.maximumZoomScale;
      CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
      [imageScroll zoomToRect:zoomRect animated:YES];
   }
}

Answer 1

在您的应用程序中使用以下代码

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:    self action:@selector(handleSingleTap)];
singleTap.numberOfTapsRequired = 1;
singleTap.delaysTouchesEnded = YES;

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:   self action:@selector(handleDoubleTap)];
doubleTap.numberOfTapsRequired = 2;


[singleTap requireGestureRecognizerToFail:doubleTap];

[self.view addGestureRecognizer:singleTap];
[self.view addGestureRecognizer:doubleTap];


-(void)handleSingleTap
{
  NSLog(@"The single tap happened");
}

-(void)handleDoubleTap
{
  NSLog(@"The double tap happened");
}

上面的代码很完美。我尝试了上面的编码。它可以单独工作。检查它。

Answer 2

为两个手势添加相同的目标

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
doubleTap.numberOfTapsRequired = 2;
doubleTap.delegate = self;
[self.view addGestureRecognizer:doubleTap];

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)];
singleTap.numberOfTapsRequired = 1;
singleTap.delegate = self;
[self.view addGestureRecognizer:singleTap];

延迟第一个点击处理程序

- (void) handleDoubleTap:(UITapGestureRecognizer*)sender {
    [self performSelector:@selector(handleSingleTap:) withObject:nil afterDelay:0.5];
    if(sender.numberOfTapsRequired == 2) {
        NSLog(@"Double tap:");
      [NSObject cancelPreviousPerformRequestsWithTarget:self];
    }
}

- (void) handleSingleTap:(UITapGestureRecognizer*)sender {
    NSLog(@"Single tap:");
}

如何在iOS中识别单个单击和双击视图？

2 个答案: