拖动，缩放和旋转多个UIImageviews

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

我已经使用了下面的代码：

- (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，处理拖动，缩放和旋转的简单方法是使用像下面这样的GestureRecognizers：

  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，你可以使用下面的函数来做到这一点：

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

根据触摸的次数，可以使用第一个或第二个函数，然后查看被触摸的点是否位于所考虑的UIImageView的框架内，例如缩放，您可以按以下方式进行缩放：

 -(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

它的工作

 -(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= %fy=%f " , _firstX,_firstY); }