如何通过拖动边缘的右上角来增加或减小 UIImageView 的大小

Question

我正在做一个应用程序，它有一个功能，通过拖动UIImageView边缘的右上角来调整UIImageView的大小，如放大和缩小。我们也可以旋转图像。

我怎样才能做到这一点？

Answer 1

如果要调整UIImage的大小，请使用SPUserRessizeableView以下链接。

对于旋转，您将添加 UIRotationGestureRecognizer 到可调整大小的视图。

Answer 2

使用此代码。在这里，图像是从照片库中挑选的，然后使用手势移动，缩放等。我正在使用所有手势来帮助您做几乎任何事情，例如平移，捏合和旋转您放置的任何图像。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[picker dismissModalViewControllerAnimated:YES];
imageCollage = [[UIImageView alloc]initWithFrame:CGRectMake(80, 80, 150, 150)];
[imageCollage setUserInteractionEnabled:YES];
imageCollage.image = [info objectForKey:UIImagePickerControllerOriginalImage];
holderView = [[UIView alloc] initWithFrame:CGRectMake(0,0,imageCollage.frame                                                          .size.width, imageCollage.frame.size.height)];
holderView.layer.cornerRadius = 6;
holderView.clipsToBounds = YES;
imageview = [[UIImageView alloc] initWithFrame:[holderView frame]];
[imageview setImage:imageCollage.image];
[holderView addSubview:imageview];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(scale:)];
[pinchRecognizer setDelegate:self];
[holderView addGestureRecognizer:pinchRecognizer];
UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
[rotationRecognizer setDelegate:self];
[holderView addGestureRecognizer:rotationRecognizer];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[holderView addGestureRecognizer:panRecognizer];
DeleteImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 30, 30)];
[DeleteImage setImage:[UIImage imageNamed:@"DeleteRed.png"]];
[holderView addSubview:DeleteImage];
DeleteImage.userInteractionEnabled = YES;
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
[tapRecognizer setDelegate:self];
[DeleteImage addGestureRecognizer:tapRecognizer];
[BaseView addSubview:holderView];
[Trash setImage:[UIImage imageNamed:@"12456977871712665073hrum_trash.svg.med.png"] forState:UIControlStateNormal];
}
   -(void)scale:(id)sender
   {
BaseView.clipsToBounds = YES;
[BaseView bringSubviewToFront:[(UIPinchGestureRecognizer*)sender view]];
if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
    lastScale = 1.0;
    return;
}   
CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]);
CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
[[(UIPinchGestureRecognizer*)sender view] setTransform:newTransform];
lastScale = [(UIPinchGestureRecognizer*)sender scale];
  }
  -(void)rotate:(id)sender
  {
[BaseView bringSubviewToFront:[(UIRotationGestureRecognizer*)sender view]];
if([(UIRotationGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
    lastRotation = 0.0;
    return;
}
CGFloat rotation = 0.0 - (lastRotation - [(UIRotationGestureRecognizer*)sender rotation]);
CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform,rotation);
[[(UIRotationGestureRecognizer*)sender view] setTransform:newTransform];
lastRotation = [(UIRotationGestureRecognizer*)sender rotation];
   }
   -(void)move:(id)sender
  {
[[[(UITapGestureRecognizer*)sender view] layer] removeAllAnimations];
BaseView.clipsToBounds = YES;
[BaseView bringSubviewToFront:[(UIPanGestureRecognizer*)sender view]];
CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];
if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan) {
    firstX = [[sender view] center].x;
    firstY = [[sender view] center].y;
}
translatedPoint = CGPointMake(firstX+translatedPoint.x, firstY+translatedPoint.y);
[[sender view] setCenter:translatedPoint];
if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded) {
    CGFloat finalX = translatedPoint.x + (.20*[(UIPanGestureRecognizer*)sender velocityInView:self.view].x);
    CGFloat finalY = translatedPoint.y + (.20*[(UIPanGestureRecognizer*)sender velocityInView:self.view].y);
    if(UIDeviceOrientationIsPortrait([[UIDevice currentDevice] orientation])) {
        if(finalX < 0) {
            finalX = 0;
        }
        else if(finalX > 260) {
            finalX = 260;
        }
        if(finalY < 0) {
            finalY = 0;
        }
        else if(finalY > 416) {
            finalY = 416;
        }
    }
    else {
        if(finalX < 0) {
            finalX = 0;
        }
        else if(finalX > 416) {
            finalX = 260;
        }
        if(finalY < 0) {
            finalY = 0;
        }
        else if(finalY > 260) {
            finalY = 416;
        }
    }
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:.35];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    [[sender view] setCenter:CGPointMake(finalX, finalY)];
    [UIView commitAnimations];
}
   }

      -(void)tapped:(UIGestureRecognizer *)recogniser
      {
    NSLog(@"%@",recogniser.view);
    [Trash setImage:[UIImage imageNamed:@"trash_bin_recycle_quit_terminate_error_cancel_close_exit.png"] forState:UIControlStateNormal];
    [[[recogniser view] superview] removeFromSuperview];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return ![gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]];
}

有关代码的任何疑问请随时询问:)...快乐编码..