09-手势识别(拖动,旋转,捏合)
1.平移
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self
action:@selector(pan:)];
添加手势
[self.imageV addGestureRecognizer:pan];
实现手势方法
手指在屏幕上移动进调用
- (void)pan:(UIPanGestureRecognizer *)pan{
获取当前手指移动的偏移量
CGPoint transP = [pan translationInView:self.imageV];
NSLog(@"%@",NSStringFromCGPoint(transP));
Make它会清空上一次的形变.
self.imageV.transform = CGAffineTransformMakeTranslation(transP.x, transP.y);
self.imageV.transform = CGAffineTransformTranslate(self.imageV.transform,
transP.x, transP.y);
复位,相对于上一次.
[pan setTranslation:CGPointZero inView:self.imageV];
}
2.旋转
添加旋转手势
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]
initWithTarget:self action:@selector(rotation:)];
设置代理,设置代理的目的就让它能够同时支持旋转跟缩放
rotation.delegate = self;
添加手势
[self.imageV addGestureRecognizer:rotation];
当旋转时调用
- (void)rotation:(UIRotationGestureRecognizer *)rotation{
旋转也是相对于上一次
self.imageV.transform = CGAffineTransformRotate(self.imageV.transform,
rotation.rotation);
设置代理,设置代理的目的就让它能够同时支持旋转跟缩放
rotation.delegate = self;
也要做复位操作
rotation.rotation = 0;
}
3.添加缩放手势
添加缩放手势
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
[self.imageV addGestureRecognizer:pinch];
缩放手势时调用
-(void)pinch:(UIPinchGestureRecognizer *)pinch{
平移也是相对于上一次
self.imageV.transform = CGAffineTransformScale(self.imageV.transform, pinch.scale,
pinch.scale);
复位
pinch.scale = 1;
}