Minor code refactoring
Minor code refactoring

jonesgithub/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,dredenba/DZNPhotoPickerController,taojack/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,ahbou/DZNPhotoPickerController,taojack/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,dzenbot/DZNPhotoPickerController,dennislysenko/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController,jonesgithub/DZNPhotoPickerController,topfreegames/TFGPhotoPickerController,taojack/DZNPhotoPickerController,ndnguru/DZNPhotoPickerController,taojack/DZNPhotoPickerController,lichuanjun/DZNPhotoPickerController,imjerrybao/DZNPhotoPickerController