Fix issue of leaking CGObjects
Fix issue of leaking CGObjects

novixon/CTAssetsPickerController,eleven-huang/CTAssetsPickerController,pcompassion/CTAssetsPickerController,lerosua/CTAssetsPickerController,novixon/CTAssetsPickerController,rokaka/CTAssetsPickerController,rokaka/CTAssetsPickerController,eleven-huang/CTAssetsPickerController,lerosua/CTAssetsPickerController