NSUserDefaults

/*NSUserDefaults通常用于存储用户偏好设置和登陆注册等信息*/

//取值
[[NSUserDefaults standardUserDefaults]objectForKey:@"night"];
//存值
[[NSUserDefaults standardUserDefaults] setObject:@"yes" forKey:@"night"];

//存储数据
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

[userDefault setObject:@"张三" forKey:@"name"];
[userDefault setInteger:23 forKey:@"age"];

//取出数据
self.navigationItem.title = [[NSUserDefaults standardUserDefaults]objectForKey:@"name"];
NSLog(@"%ld",[[NSUserDefaults standardUserDefaults]integerForKey:@"age" ]);

//修改数据
[[NSUserDefaults standardUserDefaults]setObject:@"李四" forKey:@"name"];

//强制存储
/*原因：NSUserDefaults存储数据会发生延迟现象，把数据存储到本地文件中，不是马上就生效，所以会出现娶不到数据现象*/
[[NSUserDefaults standardUserDefaults]synchronize];