添加图片功能的拓展

UIAlertController* alertController = [UIAlertControlleralertControllerWithTitle:@"选择"message:nilpreferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction* actionOne = [UIAlertActionactionWithTitle:@"拍照"style:UIAlertActionStyleDefaulthandler:nil];

UIAlertAction* actionTwo = [UIAlertActionactionWithTitle:@"从相册中选择"style:UIAlertActionStyleDefaulthandler:nil];

UIAlertAction* actionThree = [UIAlertActionactionWithTitle:@"取消"style:UIAlertActionStyleCancelhandler:nil];

[alertControlleraddAction:actionOne];

[alertControlleraddAction:actionTwo];

[alertControlleraddAction:actionThree];

[selfpresentViewController:alertControlleranimated:YEScompletion:nil];