Iphone 使用CGAffineTransform时限制UIImageView大小

我想在使用CGAffineTransform时限制uiimageview的大小。我正在限制缩放，但无法限制uiimageview的大小。当我运行应用程序时，我看到它受到限制，但在后台，我的uiimageview的大小不断增加。我怎么做这个

这是我的密码：

- (id)initWithFrame:(CGRect)frame
{
    if ([super initWithFrame:frame] == nil) {
        return nil;
    }

    originalTransform = CGAffineTransformIdentity;
    touchBeginPoints = CFDictionaryCreateMutable(NULL, 0, NULL, NULL);
    self.userInteractionEnabled = YES;
    self.multipleTouchEnabled = YES;
    self.exclusiveTouch = YES;

    return self;
}


- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
        NSMutableSet *currentTouches = [[[event touchesForView:self] mutableCopy] autorelease];
        [currentTouches minusSet:touches];
        if ([currentTouches count] > 0) {
            [self updateOriginalTransformForTouches:currentTouches];
            [self cacheBeginPointForTouches:currentTouches];
        }
        [super touchesBegan:touches withEvent:event];
        [self cacheBeginPointForTouches:touches];

}



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

    CGAffineTransform incrementalTransform = [self incrementalTransformWithTouches:[event touchesForView:self]];
    self.transform = CGAffineTransformConcat(originalTransform, incrementalTransform);

    CGAffineTransform transform = self.transform;
    float scale = sqrt(transform.a*transform.a + transform.c*transform.c);
    NSLog(@"%f",self.frame.size.height);

    if (scale > SCALE_MAX){
        self.transform = CGAffineTransformScale(transform, SCALE_MAX/scale, SCALE_MAX/scale);
    }
    else if (scale < SCALE_MIN){
        self.transform = CGAffineTransformScale(transform, SCALE_MIN/scale, SCALE_MIN/scale);
    }
    [super touchesMoved:touches withEvent:event];
}

-(void)updateOriginalTransformForTouches:(NSSet *)touches{
    CGAffineTransform transform = self.transform;
    float scale = sqrt(transform.a*transform.a + transform.c*transform.c);

    if (scale > SCALE_MAX){
        self.transform = CGAffineTransformScale(transform, SCALE_MAX/scale, SCALE_MAX/scale);
    }
    else if (scale < SCALE_MIN){
        self.transform = CGAffineTransformScale(transform, SCALE_MIN/scale, SCALE_MIN/scale);
    }

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
        for (UITouch *touch in touches) {
            if (touch.tapCount >= 2) {
                [self.superview bringSubviewToFront:self];
            }
        }

        [self updateOriginalTransformForTouches:[event touchesForView:self]];
        [self removeTouchesFromCache:touches];

        NSMutableSet *remainingTouches = [[[event touchesForView:self] mutableCopy] autorelease];
        [remainingTouches minusSet:touches];

        [super touchesEnded:touches withEvent:event];
        [self cacheBeginPointForTouches:remainingTouches];

}



- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    [self touchesEnded:touches withEvent:event];
}

-（id）initWithFrame:（CGRect）frame
{
if（[super initWithFrame:frame]==nil）{
返回零；
}
原始转换=CGAffinetransformity；
touchBeginPoints=CFDictionaryCreateMutable（NULL，0，NULL，NULL）；
self.userInteractionEnabled=是；
self.multipleTouchEnabled=是；
self.exclusiveTouch=是；
回归自我；
}
-（无效）触摸开始：（NSSet*）触摸事件：（UIEvent*）事件{
NSMutableSet*CurrentTouchs=[[[event touchesForView:self]mutableCopy]autorelease]；
[CurrentTouchs minusSet:Touchs]；
如果（[CurrentTouchs count]>0）{
[自更新原始TransformForTouches:CurrentTouchs]；
[自缓存BeginPointforTouchs:CurrentTouchs]；
}
[超级触摸开始：触摸事件：事件]；
[自缓存BeginPointforTouchs:Touchs]；
}
-（无效）触摸移动：（NSSet*）触摸事件：（UIEvent*）事件{
CGAffineTransform incrementalTransform=[self-IncrementalTransformWithTouchs:[event touchesForView:self]]；
self.transform=CGAffineTransformConcat（原始转换、增量转换）；
CG仿射变换=自变换；
浮动比例=sqrt（transform.a*transform.a+transform.c*transform.c）；
NSLog（@“%f”，自帧大小高度）；
如果（缩放>缩放最大值）{
self.transform=CGAffineTransformScale（变换，缩放最大/缩放，缩放最大/缩放）；
}
否则如果（刻度<刻度最小值）{
self.transform=CGAffineTransformScale（变换、缩放最小/缩放、缩放最小/缩放）；
}
[超级触摸移动：触摸事件：事件]；
}
-（void）updateOriginalTransformForTouches:（NSSet*）触摸{
CG仿射变换=自变换；
浮动比例=sqrt（transform.a*transform.a+transform.c*transform.c）；
如果（缩放>缩放最大值）{
self.transform=CGAffineTransformScale（变换，缩放最大/缩放，缩放最大/缩放）；
}
否则如果（刻度<刻度最小值）{
self.transform=CGAffineTransformScale（变换、缩放最小/缩放、缩放最小/缩放）；
}
}
-（void）touchesend:（NSSet*）toucheevent:（UIEvent*）event{
用于（UITouch*触摸屏）{
如果（touch.tapCount>=2）{
[self.superview将子视图带到前面：self]；
}
}
[self-updateOriginalTransformForTouches:[event touchesForView:self]]；
[self-removeTouchesFromCache:Touchs]；
NSMutableSet*remainingtouchs=[[event touchesForView:self]mutableCopy]autorelease]；
[RemainingTouchs minusSet:Touchs]；
[超级触控：触控事件：事件]；
[自缓存BeginPointforTouchs:RemainingTouchs]；
}
-（无效）触控取消：（NSSet*）触控事件：（UIEvent*）事件{
[self-touchesedend:toucheevent:event]；
}

在对其应用transform之前，您可以知道

UIImagView的
CGRect
，如下示例：

//Create transform
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1.2, 1.2);
//Apply transform on UIImageView to get CGRect
CRect  newRect = CGRectApplyAffineTransform(yourImgView.frame, scaleTransform);
//Check if rect is in valid limitation
if(newRect.size.height > 200 && newRect.size.width >200) //your condition to limit UIImageView's Size
{ 
   //Valid so apply transform
   yourImageView.transform = scaleTransform
} 
else
{
   //rect increases so no transform
   // no transform to UIImageView
   NSLog(@"%@",NSStringFromCGRect(yourImageView.frame))
}

在
UIImagView
上应用transform之前，您可以知道
CGRect
，如下示例：

//Create transform
CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1.2, 1.2);
//Apply transform on UIImageView to get CGRect
CRect  newRect = CGRectApplyAffineTransform(yourImgView.frame, scaleTransform);
//Check if rect is in valid limitation
if(newRect.size.height > 200 && newRect.size.width >200) //your condition to limit UIImageView's Size
{ 
   //Valid so apply transform
   yourImageView.transform = scaleTransform
} 
else
{
   //rect increases so no transform
   // no transform to UIImageView
   NSLog(@"%@",NSStringFromCGRect(yourImageView.frame))
}

我面临着一个类似的问题，我有一个图像视图，它根据罗盘航向数据旋转，还必须根据接口方向的设备变化移动位置

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // equal tempImageView to imageView
    _tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width-75, 150, 64, 61)];
    [_tempImageView setImage:[UIImage imageNamed:@"image.gif"]];
    _tempImageView.transform = _imageView.transform;

    // reset imageView
    [_imageView removeFromSuperview];
    _imageView = _tempImageView;
    [self.view insertSubview:_imageView atIndex:1];
}

我创建了一个tempImageView来帮助维护帧，并随着设备方向的每次更改不断重置它

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // equal tempImageView to imageView
    _tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width-75, 150, 64, 61)];
    [_tempImageView setImage:[UIImage imageNamed:@"image.gif"]];
    _tempImageView.transform = _imageView.transform;

    // reset imageView
    [_imageView removeFromSuperview];
    _imageView = _tempImageView;
    [self.view insertSubview:_imageView atIndex:1];
}

我面临着一个类似的问题，我有一个图像视图，它根据罗盘航向数据旋转，还必须根据接口方向的设备变化移动位置

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // equal tempImageView to imageView
    _tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width-75, 150, 64, 61)];
    [_tempImageView setImage:[UIImage imageNamed:@"image.gif"]];
    _tempImageView.transform = _imageView.transform;

    // reset imageView
    [_imageView removeFromSuperview];
    _imageView = _tempImageView;
    [self.view insertSubview:_imageView atIndex:1];
}

我创建了一个tempImageView来帮助维护帧，并随着设备方向的每次更改不断重置它

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    // equal tempImageView to imageView
    _tempImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.view.frame.size.width-75, 150, 64, 61)];
    [_tempImageView setImage:[UIImage imageNamed:@"image.gif"]];
    _tempImageView.transform = _imageView.transform;

    // reset imageView
    [_imageView removeFromSuperview];
    _imageView = _tempImageView;
    [self.view insertSubview:_imageView atIndex:1];
}