Sharing data between an iOS 8 share extension and main app

Question

Recently, I\'ve been making a simple iOS 8 share extension to understand how the system works. As Apple states in its App Extension Programming Guide:

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Answer 1

You should use NSUserDefaults like this following and make sure you must have enabled app group in your provisional profile and app group must configure as a green symbol and it should add to your provisional profile & BundleID.

NSUserDefaults *sharedUserDefault = [[NSUserDefaults alloc] initWithSuiteName:@"group.yougroup"];
[sharedUserDefault setObject:object forKey:@"yourkey"];
[sharedUserDefault synchronize];

NSUserDefaults *sharedUserDefault = [[NSUserDefaults alloc] initWithSuiteName:@"group.yougroup"];
sharedUserDefault value = [sharedUserDefault valueForKey:@"yourkey"];