Question

我正在努力熟悉IOS提供的每个手势，以便我可以将它们应用到我的项目中。我有水龙头和长按工作正常，但由于某种原因我的捏和旋转不会出现。我尝试了一些其他的事情，比如添加一个委托，并将它与其他代码进行比较，我看不出有什么不对。代码的第一部分是我的视图加载，其余的是手势的每种方法。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    int sw = self.view.frame.size.width;
    _tapped = [[UILabel alloc] initWithFrame:CGRectMake(sw/2-90, 30, 300, 30)];
    [self.view addSubview:_tapped];


    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapReconginzed:)];
    [tap setNumberOfTapsRequired:5];
    [self.view addGestureRecognizer:tap];//adds the gesture to the view

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressReconginzed:)];
    //[longPress numberOfTouchesRequired:1];
    [longPress setNumberOfTapsRequired:1];
    [longPress setMinimumPressDuration:3];
    [self.view addGestureRecognizer:longPress];


    UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateReconginzed:)];
    [self.view addGestureRecognizer:rotate];


    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchReconginzed:)];
    [self.view addGestureRecognizer:pinch];
}

这是我的每个手势的方法，我的点按和长按工作就好了。

-(void)tapReconginzed:(UIGestureRecognizer *)sender{
     NSString *output = [NSString stringWithFormat:@"tapped at %f", [sender locationInView:self.view].x]; 
     [_tapped setText:output];
}

-(void)longPressReconginzed:(UIGestureRecognizer *)sender{
     NSString *output = [NSString stringWithFormat:@"Long pressed at %f", [sender locationInView:self.view].x];
     [_tapped setText:output];
}

-(void)rotateReconginzed:(UIRotationGestureRecognizer *)sender{
     if ([sender state] == UIGestureRecognizerStateBegan || [sender state] == UIGestureRecognizerStateChanged) {
          CGPoint locationOne = [sender locationOfTouch:0 inView:self.view];
          NSString *output = [NSString stringWithFormat:@"rotated at %f and %f", locationOne.x, locationOne.y];
          [_tapped setText:output];
     }
}

-(void)pinchReconginzed:(UIPinchGestureRecognizer *)sender{
     if ([sender state] == UIGestureRecognizerStateBegan || [sender state] == UIGestureRecognizerStateChanged) {
          CGPoint locationOne = [sender locationOfTouch:0 inView:self.view];
          NSString *output = [NSString stringWithFormat:@"Pinched pressed at %f and %f", locationOne.x, locationOne.y];
          [_tapped setText:output];
     }

     if (sender.state == UIGestureRecognizerStateEnded){
         CGPoint locationOne = [sender locationOfTouch:0 inView:self.view];
         NSString *output = [NSString stringWithFormat:@"pinched ended at %f and %f",locationOne.x, locationOne.y];
         [_tapped setText:output];
     }
}

任何帮助将不胜感激！谢谢！

Answer 1

他们没有认出，或者只是没有出现在标签上吗？您有多个手势识别器尝试在同一标签中设置文本，因此您可能无法看到所有更新。尝试使用NSLog查看手势是否实际被识别。

如果不是，您可能还想尝试设置捏合并将手势“delegate”设置为self，然后从YES返回-gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:。

更新：以消除冲突的可能性，尝试除了捏之外的所有注释，或者除了旋转之外的所有注释，并查看它们是否可以自行工作。如果没有，您可能配置错误。让他们单独工作，然后再尝试让他们一起工作。

为什么我的捏和旋转手势无法识别？

1 个答案: