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我有一个奇怪的问题，与这个问题的答案有关：

绘制插入 NSShadow 和插入描边

我将此代码用于自定义视图的 drawRect 方法。我有这个：

- (void)drawRect:(NSRect)rect
{   
    // Create and fill the shown path
    NSBezierPath *path = [NSBezierPath 
                          bezierPathWithRoundedRect:[self bounds] 
                          xRadius:4.0f 
                          yRadius:4.0f];

    [[NSColor colorWithCalibratedWhite:0.8f alpha:0.2f] set];

    [path fill];

    // Save the graphics state for shadow
    [NSGraphicsContext saveGraphicsState];

    // Set the shown path as the clip
    [path setClip];

    // Create and stroke the shadow
    NSShadow * shadow = [[[NSShadow alloc] init] autorelease];
    [shadow setShadowColor:[NSColor colorWithCalibratedWhite:0.0f alpha:0.8f]];
    [shadow setShadowBlurRadius:2.0];
    [shadow set];
    [path stroke];

    // Restore the graphics state
    [NSGraphicsContext restoreGraphicsState];

    if ( highlight && [[self window] firstResponder] == self ) {
        NSSetFocusRingStyle(NSFocusRingOnly);
        [[NSBezierPath bezierPathWithRect:[self bounds]] fill];
    }
}

当我添加一个多行标签（我的自定义视图的同级或子级）时，问题就出现了。

当我的程序窗口失去焦点并且我回到它时，我的内部阴影/笔画变暗。似乎阴影叠加了。这很奇怪，因为如前所述，如果我的窗口只有这个自定义视图，它会很顺利。

如果我评论该行

[path setClip];

阴影不再叠加，但我没有得到想要的圆角效果（类似于 NSBox）。

I tried what happens with a Push Button instead of a Multiline Label, and by losing / getting the window focus it has no problems, but when I click the button the shadow gets superimposed.

I find the problem is similar than here, but in Cocoa instead of Java:

Java setClip seems to redraw

Thanks for your help!

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1 回答 1

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You should never use -setClip unless you know what you're doing. You should use -addClip instead, which respects the existing clipping paths.

于 2011-12-18T02:43:06.610 回答