UIImageView实现图片移动，缩放、旋转的代码片段

继承UIImageView，重写init函数。

 1 //旋转手势 2 UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer allor]initWithTarget:selft action:@selector(rotatePiece:)]; 3 [self addGestureRecognizer:rotationGesture]; 4 [rotationGesture release]; 5  6 //放大缩小手势 7 UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(scalePiece:)]; 8 [pinchGesture setDelegate:self]; 9 [self addGestureRecognizer:pinchGesture];10 [pinchGesture release];

 

 1 - (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer { 2     if (gestureRecognizer.state == UIGestureRecognizerStateBegan) { 3         UIView *piece = gestureRecognizer.view; 4         CGPoint locationInView = [gestureRecognizer locationInView:piece]; 5         CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview]; 6          7         piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height); 8         piece.center = locationInSuperview; 9     }10 }11 12 - (void)rotatePiece:(UIRotationGestureRecognizer *)gestureRecognizer13 {14     [self adjustAnchorPointForGestureRecognizer:gestureRecognizer];15     16     if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {17         [gestureRecognizer view].transform = CGAffineTransformRotate([[gestureRecognizer view] transform], [gestureRecognizer rotation]);18         rotate = [gestureRecognizer rotation];19         isMoveState = NO;20         [gestureRecognizer setRotation:0];21     }22 }23 24 - (void)scalePiece:(UIPinchGestureRecognizer *)gestureRecognizer25 {26     [self adjustAnchorPointForGestureRecognizer:gestureRecognizer];27     28     if ([gestureRecognizer state] == UIGestureRecognizerStateBegan || [gestureRecognizer state] == UIGestureRecognizerStateChanged) {29         [gestureRecognizer view].transform = CGAffineTransformScale([[gestureRecognizer view] transform], [gestureRecognizer scale], [gestureRecognizer scale]);30         scale = [gestureRecognizer scale];31         isMoveState = NO;32         [gestureRecognizer setScale:1];33     }34 }35 36 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer37 {38     if (gestureRecognizer.view != self.view)39         return NO;40     41     if (gestureRecognizer.view != otherGestureRecognizer.view)42         return NO;43     44     if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]] || [otherGestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])45         return NO;46     47     return YES;48 }

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

 1 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 2  3     UITouch *touch = [touches anyObject]; 4  5     if ([touch tapCount] == 1) 6     { 7         CGPoint currentPoint = [touch locationInView:self]; 8  9         if (isOne)10         {11             initialPoint = currentPoint;12             isOne = NO;13         }14         CGFloat offsetX = currentPoint.x + self.frame.origin.x - initialPoint.x;15         CGFloat offsetY = currentPoint.y + self.frame.origin.y - initialPoint.y;16         self.frame = CGRectMake(offsetX, offsetY, self.frame.size.width, self.frame.size.height);17     }18 }19 20 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {21 22     initialPoint = CGPointMake(0, 0);23     isOne = YES;24 }