Question

我的应用程序中有以下代码

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:kArchivedUsername forKey:userID];
    [defaults synchronize];
    NSLog(@"saved: %@", [defaults stringForKey:kArchivedUsername]);

然而，输出是这样的：

2016-04-07 15:50:44.560 BP (Test)[18357:464518] saved: (null)

有人可以告诉我为什么以及我能做些什么呢？

Answer 1

你有关键和价值逆转：

[defaults setObject:userID forKey:kArchivedUsername];

感谢：Teja Nandamuri

Answer 2

这是您的代码

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:kArchivedUsername forKey:userID];
[defaults synchronize];
NSLog(@"saved: %@", [defaults stringForKey:kArchivedUsername]);

了解如何在2个地方forKey:userID与stringForKey:kArchivedUsername

中指定密钥

最好仔细检查一下

Answer 3

尝试这个简单的

//NSUserDefault For Save:-

 [[NSUserDefaults standardUserDefaults]setValue:usernamestr1 forKey:@"Usernamestr1"];

//对于Fatch： -

 Cathing_Name_str3 =[[NSUserDefaults standardUserDefaults]objectForKey:@"Usernamestr1"];

Answer 4

[defaults stringForKey:kArchivedUsername] 

In this line pass your Key instead of Value like. Please follow below code.

[defaults stringForKey:userID] 
o/p 2016-04-07 23:13:08.723 segmentTintColor[27646:662430] saved: kArchivedUsername

同步后NSUserDefaults未保存

4 个答案: