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 may share data by Following below steps:

1) Select your project -> Select Capabilities tab -> Enable App Groups -> Click on '+' -> paste your bundle Id after 'group.'

2) Select your Extension -> Select Capabilities tab -> Enable App Groups -> Click on '+' -> paste your bundle Id after 'group.'

3) Place below code in your main app for which data you want to share:

NSUserDefaults * appGroupData = [[NSUserDefaults alloc]initWithSuiteName:@"group.com.appname"];
NSData * data = [NSKeyedArchiver archivedDataWithRootObject:[self allData]]; // Get my array which I need to share
[appGroupData setObject:data forKey:@"Data"];
[appGroupData synchronize];

4) You may get object in extension:

NSUserDefaults * appGroupData = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.appname"];
NSData * data = [appGroupData dataForKey:@"Data"];
NSArray * arrReceivedData = [NSKeyedUnarchiver unarchiveObjectWithData:data];

Answer 2

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"];