iOS将Tap Gesture添加到UIImageView

Question

正如我从代码中看到的，我在UIImageView中有一个图像，该图像具有缩放手势。

我希望能够插入图像的可点击区域，而不是屏幕，因此，如果单击具有最小或最大缩放比例的图像点，我总是返回相同的值。

我可以通过UIGestureRecognizer告诉我可以做什么吗？ 为什么我不能弄清楚我是否工作。

谢谢

我的代码：

UITapGestureRecognizer *twoFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self         action:@selector(handleTwoFingerTap:)];
[twoFingerTap setNumberOfTouchesRequired:2];
[img addGestureRecognizer:twoFingerTap];
float minimumScale = 0.4;//This is the minimum scale, set it to whatever you want. 1.0 = default
scroll.maximumZoomScale = 4.0;
scroll.minimumZoomScale = minimumScale;
scroll.zoomScale = minimumScale;
[scroll setContentMode:UIViewContentModeScaleAspectFit];
[img sizeToFit];
[scroll setContentSize:CGSizeMake(img.frame.size.width, img.frame.size.height)];

[control setSelectedSegmentIndex:0];
[control addTarget:self
            action:@selector(action:)
  forControlEvents:UIControlEventValueChanged];

//THIS IS MY RECOGNIZER ON IMAGE
UIGestureRecognizer *recognizerImage = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImage:)];
[(UITapGestureRecognizer *)recognizer setNumberOfTapsRequired:2];
[img addGestureRecognizer:recognizer];
}


- (void)tapImage:(UITapGestureRecognizer *)recognizer {

    CGPoint location = [recognizer locationInView:self.view];
    NSLog(@"x %f y %f",location.x, location.y);
}

Answer 1

尝试使用imageView作为参考：

CGPoint location = [recognizer locationInView:recognizer.view];

让我知道是否可行。

Answer 2

- (void)tapImage:(UITapGestureRecognizer *)recognizer {

    // CGPoint location = [recognizer locationInView:self.view]; // self.view will always be the same. You need to use the view on which the user tapped. It's `recognizer.view`

    CGPoint location = [recognizer locationInView:recognizer.view]; 

    NSLog(@"x %f y %f",location.x, location.y);
}

如果您想了解有关UIGestures更多信息，那么我为您提供了很好的教程。

http://www.raywenderlich.com/6567/uigesturerecognizer-tutorial-in-ios-5-pinches-pans-and-more