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我在子视图中有一个比它自己的子视图大的图像，是否可以显示子视图之外的部分图像！试过了

view.clipsToBounds=NO;

但仍然不乏。

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"]]];

前景和背景图像大于 X 射线视图

在 XrayView 我有 2 个属性

背景图像前景图像

和那个方法

- (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());
}
4

2 回答 2

5

无论如何，视图都不能超出其边界。设置clipsToBounds将只允许子视图在视图之外呈现，但它不会改变无法在drawRect视图之外绘制（在方法中）的事实。

如果您有权访问XRayView源，请查看图像是如何呈现的。他们可能是用 的drawRect方法绘制的XRayView。您必须添加一个UIImageView。

于 2012-09-19T15:30:30.017 回答
1

clipsToBounds means that the image will be clipped outside of the bounds. Make sure it is set to NO. (this was posted when the original post said clipsToBounds = YES;)

于 2012-09-19T15:18:00.750 回答