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我正在开发一个具有两个UIImageViews的绘图应用程序。我想做的是擦除顶部的 UIImageView 以便我可以看到底部的 UIImageView ，反之亦然。我已经实现了所有功能并且它的工作完美但是当我使用UIGestureRecognizer平移/缩放 UIImageView并且我开始擦除图像所以 LineWidth 也被缩放例如：如果我缩放，初始我的橡皮擦宽度设置为 25.0f我的 UIImageView 200% 我的橡皮擦也缩小到 200%，即从 25.0f 到 50.0f，这让一切都变得疯狂。所以我的问题是我怎样才能让我的橡皮擦保持原来的宽度，而不是通过图像缩放来缩小/缩小？

这是我的代码：

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

    UITouch *touch = [touches anyObject];

    if (selectedButton == self.Image1Btn)
        currentPoint = [touch locationInView:self.ImageCaptureView];
    if (selectedButton == self.Image2Btn)
        currentPoint = [touch locationInView:self.ImageCaptureView];

    if (bottomBarSelectedButton == 1)
    {        
        if (selectedButton == self.Image1Btn)
        {
            UIGraphicsBeginImageContext(self.Image1.frame.size);
            [self.Image1.image drawAtPoint:CGPointZero];

        }
        if (selectedButton == self.Image2Btn)
        {
            UIGraphicsBeginImageContext(self.Image2.image.size);
            [self.Image2.image drawAtPoint:CGPointZero];

        }

        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetLineCap(context, kCGLineCapRound);
        CGContextSetLineWidth(context, self.lineWidth);
        CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor);
        CGContextSetBlendMode(context, kCGBlendModeClear);
        CGContextBeginPath(context);
        CGContextMoveToPoint(context, previousPoint1.x, previousPoint1.y-36);
        CGContextAddLineToPoint(context, currentPoint.x, currentPoint.y-36);
        CGContextStrokePath(context);


        if (selectedButton == self.Image1Btn)
        {
            self.Image1.image = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            previousPoint1 = [touch locationInView:self.ImageCaptureView];
        }
        if (selectedButton == self.Image2Btn)
        {
            self.Image2.image = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            previousPoint1 = [touch locationInView:self.ImageCaptureView];
        }
    }
}

- (IBAction)handlePinch:(UIPinchGestureRecognizer *)recognizer {

    CGAffineTransform t = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
    recognizer.view.transform = t;
    recognizer.scale = 1;

}
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