Set view's background color to clear

weixin_34248705

于 2015-01-25 12:51:00 发布

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文章标签： php python

原文链接：https://my.oschina.net/u/913344/blog/371502

本文介绍了如何正确设置NSView的背景为透明色而非黑色的方法。通过重写isOpaque方法并返回NO来实现背景透明效果，避免使用drawRect方法导致背景显示为黑色的问题。

Sometimes, we want to set the NSView's background color to clear color, and you maybe use the code:

- (void)drawRect:(NSRect)dirtyRect {
    [super drawRect:dirtyRect];
    
    NSColor *bgColor = [NSColor clearColor];
    [bgColor set];
}

if you do like this, the background will be black,not clear,so how to do it?

The way is you don't need to use the drawRect: method,just need to call the method:

- (BOOL)isOpaque
{
    retuen YES;// or NO
}

Thanks,

Blues

转载于:https://my.oschina.net/u/913344/blog/371502