iOS Photos.framework 使用

1.查询相册使用权限

PHAuthorizationStatus st = [PHPhotoLibrary authorizationStatus];if (PHAuthorizationStatusDenied == st || PHAuthorizationStatusRestricted == st) {    NSLog(@"相册不允许访问");}if (PHAuthorizationStatusAuthorized == st || PHAuthorizationStatusNotDetermined == st)  {    NSLog(@"相册允许访问or用户未选择");}//相册变更[[PHPhotoLibrary sharedPhotoLibrary] registerChangeObserver:self];//回调方法如下，不过这个地方是有一个坑的，就是这个回调是在一个子线程里面，如果你想要对UI进行操作的话，则必须回调主线程//相册变化回调- (void)photoLibraryDidChange:(PHChange *)changeInstance {    dispatch_sync(dispatch_get_main_queue(), ^{        // your codes    });}

2.创建自己的相册

[[PHPhotoLibrary sharedPhotoLibrary]performChanges:^{    [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"相册名字"];} completionHandler:^(BOOL success, NSError * _Nullable error) {}];

3.获取自己创建的相册

PHFetchResult *userAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil];PHAssetCollection *collection = nil;for (PHAssetCollection *accc in userAlbums) {    if ([accc.localizedTitle isEqualToString:@"相册名字"]) {         collection = accc;    }}

4.保存图片到自己相册 —-删除指定相片类似

- (void)addCustomAsset:(UIImage *)image            collection:(PHAssetCollection *)collection     completionHandler:(void (^)(void))successBlock              failture:(void (^)(NSString * _Nonnull))failtureBlock{    //执行变化请求    [self.photoLibaray performChanges:^{        //如果相册允许操作        if([collection canPerformEditOperation:PHCollectionEditOperationAddContent]){            //创建资源请求对象            PHAssetChangeRequest * assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];            //创建相册请求对象            PHAssetCollectionChangeRequest * groupChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];            //向相册中添加资源。要删除相片，换个方法即可            [groupChangeRequest addAssets:@[assetChangeRequest.placeholderForCreatedAsset]];        }    }completionHandler:^(BOOL success, NSError * _Nullable error) {        if (success == YES)//成功 {            successBlock();return;        }        //失败        failtureBlock(error.localizedDescription);    }];}

5.保存视频到自己相册

- (void)addCustomAsset2:(NSURL *)url             collection:(PHAssetCollection *)collection      completionHandler:(void (^)(void))successBlock               failture:(void (^)(NSString * _Nonnull))failtureBlock {    //执行变化请求    [self.photoLibaray performChanges:^{        //如果相册允许操作        if([collection canPerformEditOperation:PHCollectionEditOperationAddContent]){            //创建资源请求对象            PHAssetChangeRequest * assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];            //创建相册请求对象            PHAssetCollectionChangeRequest * groupChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];            //向相册中添加资源            [groupChangeRequest addAssets:@[assetChangeRequest.placeholderForCreatedAsset]];        }    }completionHandler:^(BOOL success, NSError * _Nullable error) {       if (success == true)//成功 {           successBlock();return;       }       //失败       failtureBlock(error.localizedDescription);    }];}

6.保存图片/视频到相机胶卷

UISaveVideoAtPathToSavedPhotosAlbum(self.videoPath, self, @selector(video:didFinishSavingWithError:contextInfo:), NULL);UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);//图片保存回调- (void)image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo {    NSLog(@"保存成功与否提示");}//录像保存完毕- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo: (void *)contextInfo {    NSLog(@"保存成功与否提示");}

7.获取自己相册的图片

PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];//按创建日期排序,最新在前面fetchOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];//筛选图片，只要图片。只要视频mediaType=2fetchOptions.predicate = [NSPredicate predicateWithFormat:@"mediaType=1"];//collection 可以从前面方法获取到PHFetchResult *albumsPic = [PHAsset fetchAssetsInAssetCollection:collection options:fetchOptions];//获取第二张图PHAsset *asset = albumsPic[1];PHCachingImageManager *imageManager = [[PHCachingImageManager alloc] init];//可以设置options，获取到图片的质量//        PHImageRequestOptions *options = [PHImageRequestOptions new];//        options.version = PHImageRequestOptionsVersionCurrent;//        options.deliveryMode = PHImageRequestOptionsDeliveryModeFastFormat;//        options.resizeMode = PHImageRequestOptionsResizeModeFast;[imageManager requestImageForAsset:asset                        targetSize:AssetGridThumbnailSize                       contentMode:PHImageContentModeDefault                           options:nil//options                     resultHandler:^(UIImage *result, NSDictionary *info) {    self.imageView.image = result;                    }];

8.获取胶卷所以图片/视频/音频

PHFetchOptions *options = [[PHFetchOptions alloc] init];        /// 按创建日期排序options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];//获取胶卷所有图片。要获取视频，把类型改为PHAssetMediaTypeVideo，音频的为PHAssetMediaTypeAudioPHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:options];//枚举里面的内容[result enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {    PHAsset *asset = (PHAsset *)obj;}];

9.只能相册获取

//获取所有智能相册PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];[smartAlbums enumerateObjectsUsingBlock:^(PHAssetCollection * _Nonnull collection, NSUInteger idx, BOOL *stop) {    NSLog(@"相册名字:%@", collection.localizedTitle);}];//智能相册的title不出意外都是英文，下面提供一个对应的中文名- (NSString *)transformAblumTitle:(NSString *)title{    if ([title isEqualToString:@"Slo-mo"]) {        return @"慢动作";    } else if ([title isEqualToString:@"Recently Added"]) {        return @"最近添加";    } else if ([title isEqualToString:@"Favorites"]) {        return @"最爱";    } else if ([title isEqualToString:@"Recently Deleted"]) {        return @"最近删除";    } else if ([title isEqualToString:@"Videos"]) {        return @"视频";    } else if ([title isEqualToString:@"All Photos"]) {        return @"所有照片";    } else if ([title isEqualToString:@"Selfies"]) {        return @"自拍";    } else if ([title isEqualToString:@"Screenshots"]) {        return @"屏幕快照";    } else if ([title isEqualToString:@"Camera Roll"]) {        return @"相机胶卷";    }    return nil;}