拖动实现图片移动效果

 拖动实现图片移动效果

先写一个手势，注意图片的 userInteractionEnabled设置为yes

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer
alloc]
initWithTarget:self
action:@selector(pan:)];

UIImage *image = [UIImage
imageNamed:@"r.jpg"];

UIImageView *imageView = [[UIImageView
alloc] initWithFrame:CGRectMake(10,
40, 80,
80)];

imageView.image = image;

imageView.userInteractionEnabled =
YES;

[self
addSubview:imageView];

[imageView
addGestureRecognizer:pan];

}

拖动的方法，最后一句是关键代码

- (void)pan:(UIPanGestureRecognizer *)gesture

{

CGPoint point = [gesture
translationInView:self];

gesture.view.center =
CGPointMake(gesture.view.center.x + point.x, gesture.view.center.y
+ point.y);

[gesture setTranslation:CGPointMake(0,
0) inView:self];

}