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"];


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



Post a Comment

Popular posts from this blog

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 }

Collection view inside table view with NO vertical scrolling

UICollectionView inside a UITableViewCell — dynamic height?
Given the following structure: TableViewTableViewCellCollectionViewCollectionViewCellCollectionViewCellCollectionViewCell[...variable number of cells or different cell sizes]
The solution is to tell auto layout to compute first the collectionViewCell sizes, then the collection view contentSize, and use it as the size of your cell. This is the UIView method that "does the magic": -(void)systemLayoutSizeFittingSize:(CGSize)targetSize      withHorizontalFittingPriority:(UILayoutPriority)horizontalFittingPriority            verticalFittingPriority:(UILayoutPriority)verticalFittingPriority

Full code is available here to download.
Thanks to this awesome answer.