UIGestureRecognizer，使摇摄图片返回到原来的位置

Question

我是Objective-C的新手。我正在制作一个简单的应用程序，当我用手指拉动图片时，需要将图片向下移动到屏幕底部。然后图片应该回到原来的位置。我如何实现这一目标？这是我迄今为止的，但我无法弄清楚图片的返回。

@implementation TestiAppViewController 

-(IBAction)controlPan:(UIPanGestureRecognizer *)recognizer { 

CGPoint translation = [recognizer translationInView:self.view]; 
if ((recognizer.view.center.y + translation.y < 320) && (recognizer.view.center.y +  translation.y > 100)) { 
    recognizer.view.center = CGPointMake(recognizer.view.center.x,recognizer.view.center.y + translation.y); 
} 

[recognizer setTranslation:CGPointMake(0,0) inView:self.view]; 

NSLog(@"Ended Center: %@", NSStringFromCGPoint(recognizer.view.center)); 

} 

Answer 1

我想添加return语句。希望它能工作

if ((recognizer.view.center.y + translation.y < 320) && (recognizer.view.center.y +  translation.y > 100)) { 
    recognizer.view.center = CGPointMake(recognizer.view.center.x,recognizer.view.center.y + translation.y); 
return; 
}