Objective c 如何在数组中保存NSUserDefault的值，以及如何检索和发布

我必须将NSUserDefault的值保存到数组中，然后再发布这些值 使用HTTP POST时，我正在尝试这段代码，它工作正常（当我重新打开应用程序时，屏幕上的值会再次出现），但当我输入tte值时…它会显示userneme=null，database=null…），我应该怎么做呢，，，，请帮助我…代码将提前通知…Thanx

[NSUserDefaults resetStandardUserDefaults]

NSUserDefaults *storeData = [NSUserDefaults standardUserDefaults];
[storeData setObject:utextFieldNormal.text forKey:@"username"];
[storeData setObject:urltextFieldNormal.text forKey:@"url"];
[storeData setObject:dtextFieldNormal.text forKey:@"database"];



[storeData setObject:utextFieldNormal.text forKey:@"username"];
[storeData setObject:urltextFieldNormal.text forKey:@"url"];
[storeData setObject:dtextFieldNormal.text forKey:@"database"];

NSString *val1= [storeData valueForKey:@"username "];
NSString *val2= [storeData valueForKey:@"url"];
NSString *val3= [storeData valueForKey:@"database "];



//NSLog(@"username:%@",username);
NSLog(@"username:%@",val1);
NSLog(@"url:%@",val2);
NSLog(@"database:%@",val3);

[storeData synchronize];

---

这是实际复制/粘贴的代码吗？传递给valueForkey的键字符串的末尾有额外的空格。去掉空格，它就可以正常工作了