1. UIRotationGestureRecognizer（旋转）基本介绍
2. UIRotationGestureRecognizer应用举例
// 旋转
- (void)setUpRotation
{
// 旋转
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
rotation.delegate = self;
[self.imageView addGestureRecognizer:rotation];
}
- (void)rotation:(UIRotationGestureRecognizer *)rotation
{
NSLog(@"%f",rotation.rotation);
self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
// 复位
rotation.rotation = 0;
}
3. UIRotationGestureRecognizer属性
// 旋转角度
@property (nonatomic) CGFloat rotation;
// 旋转速度
@property (nonatomic,readonly) CGFloat velocity;//vəˈlɒsəti
