NSView、设置BackgroundColor

NSView *view = [[NSView alloc] initWithFrame:NSMakeRect(100, 150, 100, 50)];

view.wantsLayer = YES;（很重要，不设置是否显示layer，默认是不显示，设置颜色也不会显示）

view.layer.backgroundColor = [NSColor blueColor].CGColor;（设置背景色要通过layer来设置）

[view setNeedsDisplay:YES];（可要也可不要）

[self.view addSubview:view];

NSButton 设置 BackgroundColor

方法一：

[[button cell] setBackgroundColor:[NSColor redColor]];

方法二：

+(NSImage *)swatchWithColor:(NSColor *)color size:(NSSize)size

{

NSImage *image = [[NSImage alloc] initWithSize:size];

[image lockFocus];

[color drawSwatchInRect:NSMakeRect(0, 0, size.width, size.height)];

[image unlockFocus];

return image;

}

NSImage *image = [NSImage swatchWithColor:[NSColor greenColor] size:button.frame.size];   [[button cell] setBackgroundColor:[NSColor redColor]];

button.image = image;