Settings.bundle的DefaultValue不起作用？(NSUserDefaults)

第一次需要用iPhone系统配置，发现Settings.bundle/Rool.plist中的DefaultValue不起作用。返回是nil。Google了下，NSUserDefaults确实没有提供现成的方法去让DefaultValue生效。解决办法如下：

在程序的- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{}中检测设置的项值，如果为nil就全部设为DefaultValue的值：

 

// [YourApp]AppDelegate.m
- (BOOL)application:(UIApplication * )application
didFinishLaunchingWithOptions:(NSDictionary * )launchOptions {

NSString * name = [[NSUserDefaults standardUserDefaults]
stringForKey: @" name_preference " ];
if ( ! name) {
// 加载默认配置
[self performSelector:@selector(registerDefaultsFromSettingsBundle)];
}

[window addSubview:viewController.view];
[window makeKeyAndVisible];

return YES;
}
// 获取默认设置
- ( void )registerDefaultsFromSettingsBundle {
NSString * settingsBundle = [[NSBundle mainBundle] pathForResource: @" Settings " ofType: @" bundle " ];
if ( ! settingsBundle) {
NSLog( @" Could not find Settings.bundle " );
return ;
}

NSDictionary * settings = [NSDictionary dictionaryWithContentsOfFile:[settingsBundle stringByAppendingPathComponent: @" Root.plist " ]];
NSArray * preferences = [settings objectForKey: @" PreferenceSpecifiers " ];

NSMutableDictionary * defaultsToRegister = [[NSMutableDictionary alloc] initWithCapacity:[preferences count]];
for (NSDictionary * prefSpecification in preferences) {
NSString * key = [prefSpecification objectForKey: @" Key " ];
if (key) {
[defaultsToRegister setObject:[prefSpecification objectForKey: @" DefaultValue " ] forKey:key];
}
}
[[NSUserDefaults standardUserDefaults] registerDefaults:defaultsToRegister];
[defaultsToRegister release];
}

 

 

Download DefaultSettingsDemo

 

Ref:http://stackoverflow.com/questions/510216/can-you-make-the-settings-in-settings-bundle-default-even-if-you-dont-open-the-s

转载于:https://www.cnblogs.com/elfsundae/archive/2010/12/29/1920869.html