相册获取照片时，同时获取照片名称

首先我们要添加AssetsLibrary库

#import <AssetsLibrary/AssetsLibrary.h>

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view from its nib.        [self setTitle:[AppDelegate appDelegate].mainListDataSource[2]];    self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects:[[UIBarButtonItem alloc]initWithTitle:@"相册" style:UIBarButtonItemStyleDone target:self action:@selector(pickPicture)], nil];        _showPicIMGV.layer.cornerRadius = 20;    _showPicIMGV.layer.borderWidth = 1;    _showPicIMGV.layer.masksToBounds = YES;    }- (void)pickPicture {    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {        UIImagePickerController *imgPicker = [[UIImagePickerController alloc]init];        imgPicker.delegate = self;        imgPicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;        [self.navigationController presentViewController:imgPicker animated:YES completion:^{        }];    }}- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{    NSURL *imgUrl = [info objectForKey:UIImagePickerControllerReferenceURL];    ALAssetsLibraryAssetForURLResultBlock resultBlock = ^(ALAsset *myAsset){        ALAssetRepresentation *reprsentation = [myAsset defaultRepresentation];        imgName = [reprsentation filename];        UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];        _showPicIMGV.image = img;        [picker dismissViewControllerAnimated:YES completion:nil];    };    [[[ALAssetsLibrary alloc]init]assetForURL:imgUrl resultBlock:resultBlock failureBlock:nil];    }