Permanent Storage with Default System in iPhone

Sometimes we required to store our choices with the Device

like:

 Language Selection ,  Units of Measurement etc

With iPhone you can do all these by using class 

 NSUserDefaults , it provides a programmatic interface for interacting with the defaults system. 

The defaults system allows an application to customize its behavior to match a user’s preferences. 

You can store six types 

1. NSData

2. NSString

3. NSNumber ( Int ,Float , Double , Bool )

4. NSDate

5. NSArray

6. NSDictionary

For Writing the way will be as 

let data = NSUserDefaults.standardUserDefaults(); // Default

data.setObject("Value for Key ", forKey: "KeyName")

     // Set Value for the Key 

Like i am going to add my First Name  as Ravi with key name

data.setObject("Ravi", forKey: "name")

For Reading the way will be as 

let data = NSUserDefaults.standardUserDefaults();

let getData =  data.objectForKey("fname")!  

Now getData can be used for any purpose as per your App Requirements.

The another Methods are 

• func setBool(Bool Value , "KeyName")
• func setInteger(Int Value ,  "KeyName")
• func setFloat(Float Value ,  "KeyName")
• func setDouble(Double Value ,  "KeyName")
• func setObject(value: AnyObject?,  "KeyName")
• func setURL(url: NSURL?, f "KeyName")

keyName should be String.