Unlock a feature in App A if App B is installed

Question

I have two iOS applications say App A and App B. I need to implement a feature like follows:

If user is installed my App A, then I need to ask user to install my App B (if not installed) to unlock a special feature in App A.

My issues:

• How to find my App B is installed or not ?
• If App B is installed how to unlock a feature in App A ?
• Can I share the data through Keychain ?

What I tried:

• I searched alot but couldn't find any tutorials or sample codes
• Checked apple documentation but couldn't get any options
• I saw a similar functionality in Talking Ginger application. It asks to install another application from similar company to get extra credits.

I think there is someway to do this without using private frameworks because the above mentioned apps are approved by apple and available in app store.

Thanks in advance

Answer 1

Why dont you use iOS URL Schema canOpenURL. Using Url schema you can find an application is installed or not.

UIApplication *myApplication = [UIApplication sharedApplication];
NSString *myPath = @"appURL://";
NSURL *myURL = [NSURL URLWithString:myPath];
if ([myApplication canOpenURL:myURL]) {
    //Installed
    //Go for unlock login
}
else {
    //Not Installed
    //Inform user application not installed and redirect to iTunes Application url 
}