简单的例子

Created: November-22, 2018

例如：

为了节省：

  NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

  // saving an NSString
  [prefs setObject:txtUsername.text forKey:@"userName"];
  [prefs setObject:txtPassword.text forKey:@"password"];

  [prefs synchronize];

用于检索

  NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

  // getting an NSString
 NSString *savedUsername = [prefs stringForKey:@"userName"];
 NSString *savedPassword = [prefs stringForKey:@"password"];