Set view's background color to clear

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
}

Reference:http://www.cocoachina.com/bbs/read.php?tid=85775

               http://www.cocoachina.com/bbs/read.php?tid-45122.html

Thanks,

Blues