原文地址http://blog.csdn.net/crazy_frog/article/details/8664108/
// 添加所有的手势 - (void) addGestureRecognizerToView:(UIView *)view { // 旋转手势 UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)]; [view addGestureRecognizer:rotationGestureRecognizer]; // 缩放手势 UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)]; [view addGestureRecognizer:pinchGestureRecognizer]; // 移动手势 UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)]; [view addGestureRecognizer:panGestureRecognizer]; } // 处理旋转手势 - (void) rotateView:(UIRotationGestureRecognizer *)rotationGestureRecognizer { UIView *view = rotationGestureRecognizer.view; if (rotationGestureRecognizer.state == UIGestureRecognizerStateBegan || rotationGestureRecognizer.state == UIGestureRecognizerStateChanged) { view.transform = CGAffineTransformRotate(view.transform, rotationGestureRecognizer.rotation); [rotationGestureRecognizer setRotation:0]; } } // 处理缩放手势 - (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer { UIView *view = pinchGestureRecognizer.view; if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) { view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale); pinchGestureRecognizer.scale = 1; } } // 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]; } }
[self addGestureRecognizerToView:view];
//如果处理的是图片,别忘了
[imageView setUserInteractionEnabled:YES];
[imageView setMultipleTouchEnabled:YES];
在.h文件里边定义变量
@interface YourViewController : UIViewController<UIGestureRecognizerDelegate> { CGFloat lastScale; CGRect oldFrame; //保存图片原来的大小 CGRect largeFrame; //确定图片放大最大的程度 }
viewDidLoad里面加上
- (void)viewDidLoad { [super viewDidLoad]; showImgView = [[UIImageView alloc] initWithFrame:<span class="s1">CGRectMake</span>(<span class="s2">0</span>, <span class="s2">0</span>, 320, 480)]; [showImgView setMultipleTouchEnabled:YES]; [showImgView setUserInteractionEnabled:YES]; [showImgView setImage:[UIImage imageNamed:@"1.jpg"]]; oldFrame = showImgView.frame; largeFrame = CGRectMake(0 - screenSize.width, 0 - screenSize.height, 3 * oldFrame.size.width, 3 * oldFrame.size.height); [self addGestureRecognizerToView:showImgView]; [self.view addSubview:showImgView];
我修改了缩放的代码,增加了限制,其他的类似
// 处理缩放手势 - (void) pinchView:(UIPinchGestureRecognizer *)pinchGestureRecognizer { UIView *view = pinchGestureRecognizer.view; if (pinchGestureRecognizer.state == UIGestureRecognizerStateBegan || pinchGestureRecognizer.state == UIGestureRecognizerStateChanged) { view.transform = CGAffineTransformScale(view.transform, pinchGestureRecognizer.scale, pinchGestureRecognizer.scale); if (showImgView.frame.size.width < oldFrame.size.width) { showImgView.frame = oldFrame; //让图片无法缩得比原图小 } if (showImgView.frame.size.width > 3 * oldFrame.size.width) { showImgView.frame = largeFrame; } pinchGestureRecognizer.scale = 1; } }
时间: 2024-10-07 09:16:34