ios開發--旋轉、移動、縮放手勢執行個體代碼

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// 添加所有的手勢  

• - (void) addGestureRecognizerToView:(UIView *)view  
• {  
•     // 旋轉手勢  
•     UIRotationGestureRecognizer *rotationGestureRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotateView:)];  
•     [view addGestureRecognizer:rotationGestureRecognizer];  
•       
•     // 縮放手勢  
•     UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchView:)];  
•     [view addGestureRecognizer:pinchGestureRecognizer];  
•       
•     // 移動手勢  
•     UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panView:)];  
•     [view addGestureRecognizer:panGestureRecognizer];  
• }  
•   
• // 處理旋轉手勢  
• - (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];  
•     }  
• }  
•   
• // 處理縮放手勢  
• - (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;  
•     }  
• }  
•   
• // 處理拖拉手勢  
• - (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];  
•     }  
• }  

 

別忘了

Java代碼  

1. [self addGestureRecognizerToView:view];  

 

如果處理的是圖片，別忘了

 C代碼  

1. [imageView setUserInteractionEnabled:YES];  
2. [imageView setMultipleTouchEnabled:YES];  

ios開發--旋轉、移動、縮放手勢執行個體代碼