一、手势
//点击手势
UITapGestureRecognizer *tap
//移动手势
UIPanGestureRecognizer *pan
//添加到视图上面
[imageView addGestureRecognizer:pan];
#pragma mark - 移动手势的方法
- (void)pan:(UIPanGestureRecognizer *)pan{
//手势的生命：began - changed - ended
//判断手势的状态:state
if (pan.state == UIGestureRecognizerStateBegan || pan.state == UIGestureRecognizerStateChanged) {
//1、找到手势所在的view
UIImageView *imageView = (UIImageView *)pan.view;
//2、获取手势移动的位移
CGPoint point = [pan translationInView:self.view];
//3、更改imageView的位置
imageView.center = CGPointMake(imageView.center.x + point.x, imageView.center.y + point.y);
//4、手势的位移是会叠加的，需要把手势移动的位移归零
//CGPointZero == CGPointMake(0,0)
[pan setTranslation:CGPointZero inView:self.view];
}
}
//缩放手势
UIPinchGestureRecognizer *pinch
//旋转手势
UIRotationGestureRecognizer *rotation
