UIImageView实现图片移动，缩放、旋转的代码片段

继承UIImageView，重写init函数。

//旋转手势
 UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer allor]initWithTarget:selft action:@selector(rotatePiece:)];
 [self addGestureRecognizer:rotationGesture];
 [rotationGesture release];
 
 //放大缩小手势
 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(scalePiece:)];
 [pinchGesture setDelegate:self];
 [self addGestureRecognizer:pinchGesture];
 [pinchGesture release];

 

- (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer {
     if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {
         UIView *piece = gestureRecognizer.view;
         CGPoint locationInView = [gestureRecognizer locationInView:piece];
         CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview];
         
         piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height);
         piece.center = locationInSuperview;
     }
 }
 
 - (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer
 {
     [self adjustAnchorPointForGestureRecognizer:gestureRecognizer];
     
     if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
         [gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);
         rotate = [gestureRecognizer rotation];
         isMoveState = NO;
         [gestureRecognizer setRotation:0];
     }
 }
 
 - (void)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer
 {
     [self adjustAnchorPointForGestureRecognizer:gestureRecognizer];
     
     if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {
         [gestureRecognizer view].transform = CGAffineTransformScale([[gestureRecognizer view] transform], [gestureRecognizer scale], [gestureRecognizer scale]);
         scale = [gestureRecognizer scale];
         isMoveState = NO;
         [gestureRecognizer setScale:1];
     }
 }
 
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {
     if (gestureRecognizer.view != self.view)
         return NO;
     
     if (gestureRecognizer.view != otherGestureRecognizer.view)
         return NO;
     
     if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] || [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])
         return NO;
     
     return YES;
 }

 

//移动方法，仍是继承UIImageView重写Touch
initialPoint为全局CGPoint

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
 
     UITouch *touch = [touches anyObject];
 
     if ([touch tapCount] == 1)
     {
         CGPoint currentPoint = [touch locationInView:self];
 
         if (isOne)
         {
             initialPoint = currentPoint;
             isOne = NO;
         }
         CGFloat offsetX = currentPoint.x + self.frame.origin.x - initialPoint.x;
         CGFloat offsetY = currentPoint.y + self.frame.origin.y - initialPoint.y;
         self.frame = CGRectMake(offsetX, offsetY, self.frame.size.width, self.frame.size.height);
     }
 }
 
 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
 
     initialPoint = CGPointMake(0, 0);
     isOne = YES;
 }