UIScrollView检测用户水龙头

Question

我使用UIScrollView与PagingEnabled，在UIScrollView内我添加了三个UIImage。它工作正常。

我想知道如何检测用户是否在UIImage中的两个方块之间轻击，例如：在附加图像中，如何检测用户是否在方块1和方块2之间轻击或用户是否在方块2和3？

任何想法？

谢谢。

Answer 1

添加手势图像视图

imageView.userInteractionEnabled = YES; 
UIPinchGestureRecognizer *pgr = [[UIPinchGestureRecognizer alloc] 
    initWithTarget:self action:@selector(handlePinch:)]; 
pgr.delegate = self; 
[imageView addGestureRecognizer:pgr]; 
[pgr release]; 
: 
: 
- (void)handlePinch:(UIPinchGestureRecognizer *)pinchGestureRecognizer 
{ 
    //handle pinch... 
} 

Answer 2

为了检测单个或多个抽头使用UITapGestureRecognizer，其UIGestureRecognizer一个子类。您不应该忘记将userInteractionEnabled属性设置为YES，因为UIImageView - 类将默认值更改为NO。

self.imageView.userInteractionEnabled = YES; 
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)]; 
// Set the number of taps, if needed 
[tapRecognizer setNumberOfTouchesRequired:1]; 
// and add the recognizer to our imageView 
[imageView addGestureRecognizer:tapRecognizer]; 

- (void)handleTap:(UITapGestureRecognizer *)sender { 
    if (sender.state == UIGestureRecognizerStateEnded) { 
     // if you want to know, if user tapped between two objects 
     // you need to get the coordinates of the tap 
     CGPoint point = [sender locationInView:self.imageView]; 
     // use the point 
     NSLog(@"Tap detected, point: x = %f y = %f", point.x, point.y); 
     // then you can do something like 
     // assuming first square's coordinates: x: 20.f y: 20.f width = 10.f height: 10.f 
     // Construct the frames manually 
     CGRect firstSquareRect = CGRectMake(20.f, 20.f, 10.f, 10.f); 
     CGRect secondSquareRect = CGRectMake(60.f, 10.f, 10.f, 10.f); 
     if(CGRectContainsPoint(firstSquareRect, point) == NO && 
      CGRectContainsPoint(secondSquareRect, point) == NO && 
      point.y < (firstSquareRect.origin.y + firstSquareRect.size.height) /* the tap-position is above the second square */) { 
     // User tapped between the two objects 
     } 
    } 
}