iPhone 忽然发现,setting配置文件中的DefaultValue可能拿不了值

按照我的想法,如果用户没有在setting设置值且有default-value,那么应该获取的是default-value,因为打开setting也能看见这些值.但是今天突然发现好像不是那么会事.获取的是null.看了AppPrefs的代码,它也进行了判断.如下:

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- (void)applicationDidFinishLaunching:(UIApplication *)application{	[window addSubview:[navigationController view]];		NSString *testValue = [[NSUserDefaults standardUserDefaults] stringForKey:kFirstNameKey];	if (testValue == nil)	{		// no default values have been set, create them here based on what's in our Settings bundle info		//		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"];		NSString *firstNameDefault;		NSString *lastNameDefault;		NSNumber *nameColorDefault;		NSNumber *backgroundColorDefault;				NSDictionary *prefItem;		for (prefItem in prefSpecifierArray)		{			NSString *keyValueStr = [prefItem objectForKey:@"Key"];			id defaultValue = [prefItem objectForKey:@"DefaultValue"];						if ([keyValueStr isEqualToString:kFirstNameKey])			{				firstNameDefault = defaultValue;			}			else if ([keyValueStr isEqualToString:kLastNameKey])			{				lastNameDefault = defaultValue;			}			else if ([keyValueStr isEqualToString:kNameColorKey])			{				nameColorDefault = defaultValue;			}			else if ([keyValueStr isEqualToString:kBackgroundColorKey])			{				backgroundColorDefault = defaultValue;			}		}		// since no default values have been set (i.e. no preferences file created), create it here				NSDictionary *appDefaults = [NSDictionary dictionaryWithObjectsAndKeys:										firstNameDefault, kFirstNameKey,										lastNameDefault, kLastNameKey,										nameColorDefault, kNameColorKey,										backgroundColorDefault, kBackgroundColorKey,									  nil];		[[NSUserDefaults standardUserDefaults] registerDefaults:appDefaults];		[[NSUserDefaults standardUserDefaults] synchronize];	}		// we're ready to do, so lastly set the key preference values	firstName = [[NSUserDefaults standardUserDefaults] stringForKey:kFirstNameKey];	lastName = [[NSUserDefaults standardUserDefaults] stringForKey:kLastNameKey];	textColor = [[NSUserDefaults standardUserDefaults] integerForKey:kNameColorKey];	backgroundColor = [[NSUserDefaults standardUserDefaults] integerForKey:kBackgroundColorKey];}

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