登录成功用NSUserDefault存储数据，登录页面的用户名和密码已经保存成功，用真机或模拟器调试也是能保存成功，因为我保存数据之后点Home键之后再返回程序登录页面的用户名和密码数据还在，但是这里是有个问题一直没想通的是，程序在用真机或模拟器调试过程中，NSUserDefault存储数据，已经保存成功了，此时点击Xcode中的这个按钮
App退出到真机或模拟器桌面，之后点击App图标，登录页面的用户名和密码没了？这是为什么，有知道的不？
人生最曼妙的风景，竟是内心的淡定与从容！
Post the code and have a look.
synchronize, just write to the disk and you’re done
Use synchronize to synchronize and write to disk. It should be fine.
It should be that there is no synchronized localization
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Post the code and have a look.
synchronize, just write to the disk and you’re done
Use synchronize to synchronize and write to disk. It should be fine.
It should be that there is no synchronized localization