IOS NSUserDefault Remember username and password function example code

Generally, there is an option to remember passwords in the login interface. To implement this function, you can use NSUserDefault. Here we only explain the processing method of plain text. Although this is a certain risk, we only understand how to implement this function:

First declare an NSUserDefault object:

let userDefaults = ()  //Required for local operation

Then, based on the status of the password button, determine whether to set values ​​for the user name and password. If you remember the password, you need to take out the password you need to remember and assign values ​​to these two TextFields.

Add the following code to the viewDidLoad method:

///Check remember the password mark. If it is YES, then read the username and password and assign a value to TextField    /// And set the icon background to remember state. If it is NO, then set the background to the unremembered state.    if(("isRememberPsd")) 
    { 
      (true, forKey: "isRememberPsd") 
      (UIImage(named: "pwd_checked.png"), forState: .Normal) 
       = ("userName") 
       = ("userPsw") 
    }else if(!("isRememberPsd")) 
    { 
      (false, forKey: "isRememberPsd") 
      (UIImage(named:"pwd_unchecked.png"), forState: .Normal) 
    } 

Add the following code to the click event of the login button:

if(("isRememberPsd")) 
    { 
      (userName, forKey: "userName") 
      (userPsw, forKey: "userPsw") 
    } 

If you want to remember the status of your password, you need to write the username and password to the local area before logging in.

Remember the handling of click events of password button:

//Read the status of the local key as "isRememberPsd". YES means remember the password, NO means not remembering it.    ///If YES, click again and you need to set the image to an unremembered style and change the value of the key.    if(("isRememberPsd")) 
    { 
      (UIImage(named:"pwd_unchecked.png"), forState: .Normal) 
      (false, forKey: "isRememberPsd") 
    } 
    else 
    { 
      (UIImage(named:"pwd_checked.png"), forState: .Normal) 
      (true, forKey: "isRememberPsd") 
    } 
    () 

This is a basic function of remembering passwords and automatically writing username and password to them when logging in next time.

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