【Tip】利用Xcode的环境变量来控制特定的代码开关

通常的做法是在启动时设置一些变量

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{//...#if DEBUGNSFNetworkLayerLogging &＃61; YES;NSFModelLayerLogging &＃61; YES;//...
#endifreturn YES;
}

多人协作时&＃xff0c;一个人调试时打开的开关&＃xff0c;很可能会混在正常的修改里一起提交到仓库中&＃xff0c;影响到其他人的配置。

解决方案

将开关移到Xcode的Environment variables设置里

然后

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//...#if DEBUGNSString *string &＃61; [[NSProcessInfo processInfo] environment][&＃64;"NSFModelLayerLogging"];NSFModelLayerLogging &＃61; [string boolValue];
#endifreturn YES;
}