Question

我正在做一个项目，我必须在settings.bundle中检索一些值。为此，我必须以这种方式检索默认值。我在

下访问它

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

stringObject = [defaults objectForKey:@"Key_Value"];

但是当我尝试打印stringObject

时

NSLog(@"%@",stringObject);

然后它总是打印null。我已使用键“Key_Value”在settings.bundle中保存了一个字符串值。但它返回Null。

告诉我我做错了什么

Answer 1

检查你是否以这种方式存储了你的价值： -

NSUserDefaults *pref3=[NSUserDefaults standardUserDefaults];
    [pref3 setObject:*yourstring* forKey:@"Key_Value"];
    [NSUserDefaults resetStandardUserDefaults];

您的检索代码是正确的。确保string对象是NSString类型。

Answer 2

调用此功能将解决您的问题

- (void)registerDefaultsFromSettingsBundle {
     // this function writes default settings as settings
     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];
        NSLog(@"writing as default %@ to the key %@",[prefSpecification objectForKey:@"DefaultValue"],key);
    }

   [[NSUserDefaults standardUserDefaults] registerDefaults:defaultsToRegister];

}

如何从settings.bundle访问值？

2 个答案: