拖動實現圖片移動效果

拖動實現圖片移動效果

拖動實現圖片移動效果

先寫一個手勢，注意圖片的 userInteractionEnabled設置為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];

}

拖動的方法，最後一句是關鍵代碼

- (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];

}