最近因为业务需要得用原生的IOS开发部分功能（Object-c）。
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];
}
}
