IOS 如何擷取裝置本地音視頻

IOS 如何擷取裝置本地音視頻

1、檢索音視頻

 

PHFetchOptions *allPhotosOptions;@property (nonatomic, strong) PHFetchResult *assetsFetchResults;if (allPhotosOptions == nil) {                allPhotosOptions = [[PHFetchOptions alloc] init];        allPhotosOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];    } self.assetsFetchResults = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:allPhotosOptions];

 

 

其中assetsFetchResults儲存了所有的圖片資訊，PHAssetMediaTypeImage為搜尋圖片的類型，同樣的搜尋其他類的可以根據

 

typedef NS_ENUM(NSInteger, PHAssetMediaType) {    PHAssetMediaTypeUnknown = 0,    PHAssetMediaTypeImage   = 1,    PHAssetMediaTypeVideo   = 2,    PHAssetMediaTypeAudio   = 3,} NS_ENUM_AVAILABLE_IOS(8_0);

2、擷取圖片UIImage

 

 

[[PHCachingImageManager defaultManager] requestImageForAsset:asset                                    targetSize:AssetGridThumbnailSize                                   contentMode:PHImageContentModeAspectFill                                       options:nil                                 resultHandler:^(UIImage *result, NSDictionary *info) {                                     // Set the cell's thumbnail image if it's still showing the same asset.                                     if ([cell.representedAssetIdentifier isEqualToString:asset.localIdentifier]) {                                         cell.thumbnailImage = result;                                     }                                 }];

asset為assetsFetchResults中的一個PHAsset，targetSize是擷取圖片的大小，這個根據你顯示的方式設定，如果需要擷取圖片其他資訊比如標題可以採用

[phAsset valueForKey:@"filename"];

3、播放視頻

 

-(void)setVideoAsset:(PHAsset *)videoAsset{    _videoAsset = videoAsset;    [[PHImageManager defaultManager] requestPlayerItemForVideo:_videoAsset options:nil resultHandler:^(AVPlayerItem * _Nullable playerItem, NSDictionary * _Nullable info) {        self.currentItem = playerItem;        [self.player replaceCurrentItemWithPlayerItem:self.currentItem];        [self.currentItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];    }];}