拖动，缩放和旋转多个UIImageviews

Question

到目前为止，我可以移动，缩放和旋转所有对象，但多个对象一起移动。我希望他们分开移动。我想我必须将objectatIndex更改为1，但它只是崩溃。

我用下面的代码：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 

    NSArray *allTouches = [touches allObjects]; 

    UITouch* t; 
    if([[event allTouches] count]==1){ 
     if (CGRectContainsPoint([Birdie frame], [[allTouches objectAtIndex:0] locationInView:theimageView]) && CGRectContainsPoint([imageViewauto frame], [[allTouches objectAtIndex:0] locationInView:theimageView])) { 
      t=[[[event allTouches] allObjects] objectAtIndex:0]; 
      touch1=[t locationInView:nil]; 
     } 
    }else{ 
     t=[[[event allTouches] allObjects] objectAtIndex:0]; 
     touch1=[t locationInView:nil]; 
     t=[[[event allTouches] allObjects] objectAtIndex:1]; 
     touch2=[t locationInView:nil]; 
    } 
} 

-(double)distance:(CGPoint)point1 toPoint:(CGPoint)point2 
{ 
    double deltaX, deltaY; 
    deltaX = point1.x - point2.x; 
    deltaY = point1.y - point2.y; 
    return sqrt(deltaX * deltaX + deltaY * deltaY); 
} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 

    CGPoint currentTouch1; 
    CGPoint currentTouch2; 
    NSArray *allTouches = [touches allObjects]; 
    UITouch* t; 
    float scale,rotation; 

    if([[event allTouches] count]==1){ 
     t=[[[event allTouches] allObjects] objectAtIndex:0]; 
     if (CGRectContainsPoint([Birdie frame], [[allTouches objectAtIndex:0] locationInView:theimageView]) && CGRectContainsPoint([imageViewauto frame], [[allTouches objectAtIndex:0] locationInView:theimageView])) 
     { 
      touch2=[t locationInView:nil]; 
      Birdie.center=CGPointMake(Birdie.center.x+touch2.x-touch1.x,Birdie.center.y+touch2.y-touch1.y); 
      imageViewauto.center=CGPointMake(imageViewauto.center.x+touch2.x-touch1.x,imageViewauto.center.y+touch2.y-touch1.y); 
      touch1=touch2; 
     } 
    } 
    else if([[event allTouches] count]==2) 
    { 
     t=[[[event allTouches] allObjects] objectAtIndex:0]; 
     currentTouch1=[t locationInView:nil]; 

     t=[[[event allTouches] allObjects] objectAtIndex:1]; 
     currentTouch2=[t locationInView:nil]; 

     double distance1 = [self distance:currentTouch1 toPoint:currentTouch2]; 
     double distance2 = [self distance:touch1 toPoint:touch2]; 

     if (distance2 == 0) 
     { 
      //handle the case where distance is zero 
     } 
     else { 
      scale =distance1/distance2;} 

     rotation=atan2(currentTouch2.y-currentTouch1.y, currentTouch2.x-currentTouch1.x)-atan2(touch2.y-touch1.y,touch2.x-touch1.x); 
     if(isnan(scale)){ 
      scale=1.0f; 
     } 
     NSLog(@"rotation %f",rotation); 

     NSLog(@"scale %f",scale); 

     if (CGRectContainsPoint([Birdie frame], [[allTouches objectAtIndex:0] locationInView:theimageView]) && CGRectContainsPoint([imageViewauto frame], [[allTouches objectAtIndex:0] locationInView:theimageView])) 
     { 

      Birdie.transform=CGAffineTransformScale(Birdie.transform, scale,scale); 
      Birdie.transform=CGAffineTransformRotate(Birdie.transform, rotation); 

      imageViewauto.transform=CGAffineTransformScale(imageViewauto.transform, scale,scale); 
      imageViewauto.transform=CGAffineTransformRotate(imageViewauto.transform, rotation); 
     } 
     else // In case of scaling or rotating the background imageView 
     { 
      imageView.transform=CGAffineTransformScale(imageView.transform, scale,scale); 
      imageView.transform=CGAffineTransformRotate(imageView.transform, rotation); 
     } 

     touch1=currentTouch1; 
     touch2=currentTouch2; 
    } 
} 

Answer 1

首先，一个简单的方法来处理拖拽，缩放和旋转是使用GestureRecognizers像波纹管一个：

UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)]; 
[pinchRecognizer setDelegate:self]; 
[self.view addGestureRecognizer:pinchRecognizer]; 

UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)]; 
[rotationRecognizer setDelegate:self]; 
[self.view addGestureRecognizer:rotationRecognizer]; 

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)]; 
[panRecognizer setMinimumNumberOfTouches:1]; 
[panRecognizer setMaximumNumberOfTouches:1]; 
[panRecognizer setDelegate:self]; 
[self.view addGestureRecognizer:panRecognizer]; 

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)]; 
[tapRecognizer setNumberOfTapsRequired:1]; 
[tapRecognizer setDelegate:self]; 
[self.view addGestureRecognizer:tapRecognizer]; 

要处理多个UIImageViews你可以使用触摸点的位置，你可以使用波纹管功能来做到这一点：

- (CGPoint)locationInView:(UIView*)view; 
- (CGPoint)locationOfTouch:(NSUInteger)touchIndex inView:(UIView*)view; 

根据的感动，您可以使用第一或第二功能，然后看看是否触碰点考虑的UIImageView的框架内，例如用于缩放你可以做的是展现在波纹管的数量：

-(void)scale:(id)sender { 

UIView * pinchView = [(UIPinchGestureRecognizer*)sender view]; 

CGPoint first_point = [sender locationOfTouch:0 inView:pinchView]; 
CGPoint second_point = [sender locationOfTouch:1 inView:pinchView]; 


if (CGRectContainsPoint(my_image_view.frame, first_point) && CGRectContainsPoint(my_image_view.frame, second_point)) { 
    [self.view bringSubviewToFront:pinchView]; 

    if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

     lastScale = 1.0; 
     return; 
    } 

    CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]); 

    CGAffineTransform currentTransform = my_image_view.transform; 
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale); 
    [my_image_view setTransform:newTransform]; 

    lastScale = [(UIPinchGestureRecognizer*)sender scale];}} 

Answer 2

其工作

-(void)scale:(id)sender { 

    if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) { 
     _lastScale = 1.0; 
    } 

    CGFloat scale = 1.0 - (_lastScale - [(UIPinchGestureRecognizer*)sender scale]); 

    CGAffineTransform currentTransform = self.transform; 
    CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale); 

    [self setTransform:newTransform]; 


    _lastScale = [(UIPinchGestureRecognizer*)sender scale]; 
    [self showOverlayWithFrame:self.frame]; 
} 


-(void)rotate:(id)sender { 

    if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) { 

     _lastRotation = 0.0; 

     return; 
    } 
    CGFloat rotation = 0.0 - (_lastRotation - [(UIRotationGestureRecognizer*)sender rotation]); 

    CGAffineTransform currentTransform = self.transform; 
    CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation); 

    [self setTransform:newTransform]; 
    _lastRotation = [(UIRotationGestureRecognizer*)sender rotation]; 

    [self showOverlayWithFrame:self.frame]; 
} 


-(void)move:(id)sender { 

    CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self]; 

    if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) { 
     _firstX = [self center].x; 
     _firstY = [self center].y; 
    } 

    translatedPoint = CGPointMake(_firstX+translatedPoint.x, _firstY+translatedPoint.y); 

    [self setCenter:translatedPoint]; 


    [self showOverlayWithFrame:self.frame]; 

    NSLog(@"after move x= %f  y=%f " , _firstX,_firstY); 
}