fix swift compatibility
fix swift compatibility

jiaopen/ImagePickerSheetController,larcus94/ImagePickerSheetController,machelix/ImagePickerSheetController,acavanaghww/ImagePickerSheetController,hejunbinlan/ImagePickerSheetController,jabez1314/ImagePickerSheetController,mohsinalimat/ImagePickerSheet,hulu001/ImagePickerSheetController,mohsinalimat/ImagePickerSheet,bangslosan/ImagePickerSheetController,colemancda/ImagePickerSheetController,colemancda/ImagePickerSheetController,bangslosan/ImagePickerSheetController,lbrndnr/ImagePickerSheetController,bangslosan/ImagePickerSheetController,lbrndnr/ImagePickerSheetController,liangxianzhe/ImagePickerSheetController,jabez1314/ImagePickerSheetController,colemancda/ImagePickerSheetController,liangxianzhe/ImagePickerSheetController,acavanaghww/ImagePickerSheetController,hejunbinlan/ImagePickerSheetController,jiaopen/ImagePickerSheetController,alexsanderkhitev/ImagePickerSheetController,jabez1314/ImagePickerSheetController,larcus94/ImagePickerSheetController,alexsanderkhitev/ImagePickerSheetController,mohsinalimat/ImagePickerSheet,machelix/ImagePickerSheetController,machelix/ImagePickerSheetController,hulu001/ImagePickerSheetController,hejunbinlan/ImagePickerSheetController