Question

With the release of iOS6, I am going to update my application using the new feature of iOS6, such as UICollectionView.

When I will deploy it on App Store, my application will be only available for devices on iOS6.

Question: How can I let the devices on iOS 5.1 using the older release which do not use UICollectionView?

I could go more deeper by asking: What is the strategy to upgrade an application without loosing the users which have not yet upgrade their OS?

Thank you for your advice.

Answer 1

This one will work perfectly:

NSString * systemVersion = [[UIDevice currentDevice] systemVersion];
if ([self.systemVersion compare:@"5.0" options:NSNumericSearch] != NSOrderedAscending)
    {
    osHigherThaniOS5 = TRUE;
    }

if ([self.systemVersion compare:@"6.0" options:NSNumericSearch] != NSOrderedAscending)
    {
    osHigherThaniOS6 = TRUE;
    }

Just determine the system version and set your conditions accordingly 🙂