Yosemites dark mode

检查Dark模式的代码如下：

NSDictionary *dict = [[NSUserDefaults standardUserDefaults] persistentDomainForName:NSGlobalDomain];
id style = [dict objectForKey:@"AppleInterfaceStyle"];
BOOL darkModeOn = ( style && [style isKindOfClass:[NSString class]] && NSOrderedSame == [style caseInsensitiveCompare:@"dark"]);

设置监听 darkmode 改变

[[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:@selector(darkModeChanged:) name:@"AppleInterfaceThemeChangedNotification" object:nil];

-(void)darkModeChanged:(NSNotification *)notif {
    NSLog(@"Dark mode changed");
}

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