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IOS 之UIImageView添加点击和拖动事件

Android中的ImageView默认可以点击的，也就是clickable = true;然后通过setOnClickListener进行绑定事件的观察者。

但IOS中UIImageView默认不可点击得需要额外处理：

设置可以点击和可以响应Touch事件

[self.alertImage setUserInteractionEnabled:YES];

[self.alertImage setMultipleTouchEnabled:YES];

设置点击事件的绑定

具体的处理点击和响应方法：

-(void)clickCategory:(UITapGestureRecognizer *)gestureRecognizer{

NSLog(@"小球点击了");

}

// 处理小球拖拉手势

- (void) addGestureRecognizerToView:(UIView *)view

{

// 移动手势

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

[view addGestureRecognizer:panGestureRecognizer];

}

// 处理拖拉手势

- (void) panView:(UIPanGestureRecognizer *)panGestureRecognizer

{

UIView *view = panGestureRecognizer.view;

if (panGestureRecognizer.state == UIGestureRecognizerStateBegan || panGestureRecognizer.state == UIGestureRecognizerStateChanged)

{

CGPoint translation = [panGestureRecognizer translationInView:view.superview];

[view setCenter:(CGPoint){view.center.x + translation.x, view.center.y + translation.y}];

[panGestureRecognizer setTranslation:CGPointZero inView:view.superview];

}