IOS 手势UIPinchGestureRecognizer(缩放手势) UIRotationGestureRecognizer(旋转手势)

-(void)addPhotos{    //像系统相册展示的时候照片之间会有间距    int xWdith = 20;    for(int i = 0; i<4; i++)    {        UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(xWdith+(xWdith + self.frame.size.width)*i, 0, self.frame.size.width, self.frame.size.height)];        imgView.backgroundColor = [UIColor orangeColor];        imgView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%d.jpg",i]];        imgView.contentMode = UIViewContentModeScaleAspectFit;               //缩放手势        UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]                                                            initWithTarget:self                                                            action:@selector(handlePinch:)];        [imgView addGestureRecognizer:pinchGestureRecognizer];        imgView.userInteractionEnabled = YES;                //旋转手势        UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];        [imgView addGestureRecognizer:rotationGestureRecognizer];        [photoBrowse addSubview:imgView];    }}- (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer{    UIView *view = rotationGestureRecognizer.view;//    if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) {//        view.transform = CGAffineTransformRotate(view.transform, M_PI/4);//        NSLog(@"%f",rotationGestureRecognizer.rotation);//        [rotationGestureRecognizer setRotation:0];//    }//        //3d旋转效果    CALayer *layer = view.layer;        CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;        rotationAndPerspectiveTransform.m34 = 1.0 / -500;        rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform,rotationGestureRecognizer.rotation, 0.0f, 1.0f, 0.0f);        layer.transform = rotationAndPerspectiveTransform;    }-(void)handlePinch:(UIPinchGestureRecognizer *)pinchGestureRecognizer{    UIImageView *view = (UIImageView *)pinchGestureRecognizer.view;    //    pinchGestureRecognizer.state == UIGestureRecognizerStateChanged    if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan ) {        view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale);        pinchGestureRecognizer.scale = 2;    }}