仅缩放重叠图像

Question

我在我的cameraoverlay中有一个overlayimage。当用户双击我的overlayimage时，我需要放大/缩小。

代码窗格在overlayImage：

UIImageView *overlayImageView = [[UIImageView alloc] 
initWithImage:[UIImage imageNamed:@"overlay.png"]]; 
[overlayImageView setFrame:CGRectMake(30, 100, 260, 200)]; 
[[self view] addSubview:overlayImageView]; 
[overlayImageView release]; 

Answer 1

- (void)viewDidLoad { 
    [super viewDidLoad]; 

    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; 
    tapGesture.numberOfTapsRequired = 2; 
    [overlayImageView addGestureRecognizer:tapGesture]; // add tapGesture to your ImageView 
    [tapGesture release]; 

    self.isTouch == YES; // it is BOOL type. 
} 

- (void)handleTapGesture:(UITapGestureRecognizer *)sender 
{ 
     if(self.isTouch) 
     { 
       // put relavent size of Zoom ImageView 
      self.isTouch == NO; 
     } 
     else 
     { 
       // put code for normal ImageView 
       self.isTouch == YES; 
     } 
}