1. NSVIew设置背景色

注意wantsLayer需要先写才生效

    self.bgView.wantsLayer = YES;
    self.bgView.layer.backgroundColor = [NSColor redColor].CGColor;

2. NSTextFieldCell设置背景色

setDrawsBackground:YES

   self.openResultLabel.backgroundColor = [NSColor whiteColor];
    [self.openResultLabel setDrawsBackground:YES];