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I wish to run iOS 6 programs on my iOS 5.1.1 iPad 1st generation, and all the UICollectionViews are all disappeared and debug console says
Unknown class collectionViewController in Interface Builder file
Is it because of incompatibility with UICollectionViews in iOS 5?
Correct. According to the documentation for the UICollectionView class, its availability is marked as “Available in iOS 6.0 and later.” which means it does not exist in iOS 5.