objective-c - UIView中的UIImage和显示图片部分越界

Question

我在 subview 中有一个图像，它比 subview 本身大，是否可以显示 subview 之外的图像部分!已经试过了

view.clipsToBounds=NO; 

但也不乏。

到目前为止，这是我的部分代码。

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 View 大

在 XrayView 中我有 2 个属性

背景图片前景图片

还有那个方法

- (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， View 都不能在其边界之外绘制。设置clipsToBounds 将只允许 subview 在 View 外渲染，但它不会改变 View 外绘制(在drawRect 方法中)不是这样的事实可能。

如果您有权访问 XRayView 源，请查看图像是如何呈现的。它们可能是在 XRayView 的 drawRect 方法中绘制的。您必须添加 UIImageView相反。