An demo include as much as possible usage and acknowledge about Object-C or iOS.
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Learn about the preparation of the program welcome page
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Learn about the use of general UIControllers and NavigationControllers
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Learn about the custom bottom tab control bar
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Learn about the use of UICollectionView and UICollectionViewController
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learn about UITableView and UITableViewController
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Learn about GCD multithreading programming
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Learn about the use of program appDelegate
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Learn about the storage of picture data