UIView中的UIImage并显示图像部分超出范围

Question

我在子视图中有一个比自己的子视图更大的图像,是否可以显示超出子视图的图像部分!试过了

view.clipsToBounds=NO; 

但不缺.

到目前为止,这是我的代码的一部分.

xRayView = [[XRayView alloc] initWithFrame: CGRectMake((1024 - 800) / 2, self.device.frame.origin.y - 26, 800,530)];
        xRayView.clipsToBounds=NO;
        [xRayView setForgroundImage: [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"xray_foreground_01" ofType: @"png"]]];
        [xRayView setBackgroundImage: [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"xray_background_01" ofType: @"png"]]];

前景和背景图像比X射线视图大

在XrayView中我有2个属性

backgroundImage foregroundImage

那个方法

- (void)drawRect: (CGRect)rect
{
    [super drawRect: rect];

    CGRect forgroundClips[] = {
        CGRectMake((self.frame.size.width - self.forgroundImage.size.width)/2, 0, self.forgroundImage.size.width, currentPan.origin.y),
        CGRectMake((self.frame.size.width - self.forgroundImage.size.width)/2, currentPan.origin.y + currentPan.size.height, self.forgroundImage.size.width, self.forgroundImage.size.height - (currentPan.origin.y + currentPan.size.height))
    };

    CGContextSaveGState(UIGraphicsGetCurrentContext());
    CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, self.bounds.size.height);
    CGContextScaleCTM(UIGraphicsGetCurrentContext(), 1, -1);
    CGContextClipToRects(UIGraphicsGetCurrentContext(), forgroundClips, sizeof(forgroundClips) / sizeof(forgroundClips[0]));
    //CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height), self.forgroundImage.CGImage);
    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake((self.frame.size.width - self.forgroundImage.size.width)/2, 0, self.forgroundImage.size.width, self.forgroundImage.size.height), self.forgroundImage.CGImage);
    CGContextRestoreGState(UIGraphicsGetCurrentContext());

    CGContextSaveGState(UIGraphicsGetCurrentContext());
    CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, self.bounds.size.height);
    CGContextScaleCTM(UIGraphicsGetCurrentContext(), 1, -1);
    CGContextClipToRect(UIGraphicsGetCurrentContext(), currentPan);
    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 153, 153, 153, 0.5);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 3);
    CGContextStrokeRect(UIGraphicsGetCurrentContext(), currentPan);
    //CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height), self.backgroundImage.CGImage);
    CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake((self.frame.size.width - self.backgroundImage.size.width)/2 , 0, self.backgroundImage.size.width, self.backgroundImage.size.height), self.backgroundImage.CGImage);
    CGContextRestoreGState(UIGraphicsGetCurrentContext());

    // Draw a yellow hollow rectangle

   // CGContextRestoreGState(UIGraphicsGetCurrentContext());
}

Answer 1

无论如何,视图都无法在其范围之外绘制.设置clipsToBounds仅允许在视图外部渲染子视图,但不会更改视图外部的绘图(在drawRect方法中)不可能的事实.

如果您有权访问XRayView源,请查看图像的呈现方式.它们可能是用它的drawRect方法绘制的XRayView.你必须添加一个UIImageView.