UIScrollView檢測用戶水龍頭

Question

我使用UIScrollView與PagingEnabled，在UIScrollView內我添加了三個UIImage。它工作正常。

我想知道如何檢測用戶是否在UIImage中的兩個方塊之間輕擊，例如：在附加圖像中，如何檢測用戶是否在方塊1和方塊2之間輕擊或用戶是否在方塊2和3？

任何想法？

謝謝。

Answer 1

添加手勢圖像視圖

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

爲了檢測單個或多個抽頭使用UITapGestureRecognizer，其UIGestureRecognizer一個子類。您不應該忘記將userInteractionEnabled屬性設置爲YES，因爲UIImageView - 類將默認值更改爲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 
     } 
    } 
}