NSUserDefaults存取失败

解决办法：

1.存储NSUserDefaults时,强制NSUserDefault存入沙盒

[[NSUserDefaults standardUserDefaults] setObject:sAccount forKey:kSAVE_LOGIN_ACCOUNT];
[[NSUserDefaults standardUserDefaults] setObject:sPassword forKey:kSAVE_LOGIN_PASSWORD];
[[NSUserDefaults standardUserDefaults] synchronize];

2.取出NSUserDefaults时,不要在ViewDidLoad中取,在ViewWillAppear中取出来使用

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