Skip to main content

Save value in keychain - iOS application

Login and sign up activity is very common in every ios application. Most of the applications follow single sign in process. Single sign in means user have to login only once. Generally developers tend to save values(username, password) in user default. When user delete the application, the values stored in the NSUserDefault also vanishes, then user have to sign in again.

Alternative to NSUserDefault, which save values permanently in keychain:-


  1. Grab the four files (.h and .m) PDKeychainBindingsController folder and add them to your xCode project.
  2. Import the header file. #import "PDKeychainBindings.h"

Set object:-
        [[PDKeychainBindings sharedKeychainBindings] setObject:@"Pardeep" forKey:@"key_name"];

Get object from key:-

            NSString *folderPath=[[PDKeychainBindings sharedKeychainBindings] objectForKey:@"key_name"];

Remove object:
            [[PDKeychainBindings sharedKeychainBindings] removeObjectForKey:@"key_name"];


NOTE:-

  • If you are getting any keychain access error or SecItemAdd and SecItemCopyMatching returns error code -34018, then follow this answer:- http://stackoverflow.com/a/22305193
  • keychain API only work with Strings


Source:- http://www.escortmissions.com/blog/2011/9/3/steal-this-code-and-protect-their-data-simplifying-keychain.html

Comments

Post a comment

Popular posts from this blog

Vector graphics in iOS

In past, designers had to create multiple versions of the same asset (1x, 2x, 3x) to satisfy multiple screen sizes. Using vector assets can save you time because you only have to generate the asset once. You just need an.xcassets file in your project for storing your images. In there, you can declare image sets to be “Vectors”.
A vector file contains a lot of metadata of an asset that tells the system how to render it's contents, independent of the screen's resolution. This also means that whenever we get larger screen resolutions, Xcode will be able to scale up your images from your already existing vector PDF for you, giving you automatic support for future devices for free.

Steps:-
Select “New Image Set” in your XCAsset.Select the Attributes Inspector in Utilities panel.Under the types drop-down menu, select "Vector"Drag and drop your vector PDFUse the Xcode image catalog image set as you would with any other image. For instance, calling --imageNamed: in code, and pa…

Return multiple values from a function in objective C

We can return tuples in swift as follows:-

func getData()->(Int,Int,Int){//...code herereturn( hour, minute, second)}You can't do that in objective-c. Best option is using parameters by reference. Something like this.

Disabling print for Production In Swift Project

You'll need to set up a compiler flag to use the Swift preprocessor - go to the Swift Compiler - Custom Flags section of Build Settings to set up a -D DEBUG flag:



Then in your code you can define a DLog() function and only print your message if the DEBUG flag is set:
func DLog(message: String, function: String = __FUNCTION__) { #if DEBUG     println("\(function): \(message)") #endif }