NSUserDafaults reading Root.plist got a nil value

问题:

This is the code in my AppDelegate:

    NSString *pathStr = [[NSBundle mainBundle] bundlePath];
    NSString *settingsBundlePath = [pathStr stringByAppendingPathComponent:@"Settings.bundle"];
    NSString *finalPath = [settingsBundlePath stringByAppendingPathComponent:@"Root.plist"];

    NSDictionary *settingsDict = [NSDictionary dictionaryWithContentsOfFile:finalPath];
    NSArray *prefSpecifierArray = [settingsDict objectForKey:@"PreferenceSpecifiers"];

prefSpecifiersArray is setted to 0x0 < nil >. I really don't know how is it possible! This is my Root.plist:

回答1:

The values from settings.bundle do not actually load to NSUserDefaults until the user opens the settings for the first time. By default, they are off. Once the user opens the settings bundle, they will fill in for you.