獲取本地所有的視頻及縮略圖片、獲取本地相冊圖片、調用本地攝像機錄製視頻及獲取其圖片

#pragma mark --- 獲取所有本地相冊視頻資源
- (void)getVideoData{
   
    // 獲取所有資源的集合，並按資源的創建時間排序
    PHFetchOptions *options = [[PHFetchOptions alloc] init];

    options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];

    PHFetchResult *assetsFetchResults = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeVideo options:options];
    
    for (NSInteger i = 0; i < assetsFetchResults.count; i++) {
        

        PHAsset *asset = assetsFetchResults[i];

//異步執行

    dispatch_async(dispatch_queue_create("com.tany.searchMarkDb", DISPATCH_QUEUE_SERIAL), ^{
        

        [[PHImageManager defaultManager]requestPlayerItemForVideo:asset options:nil resultHandler:^(AVPlayerItem * _Nullable playerItem, NSDictionary * _Nullable info) {

          //把視頻資源加入數組
            [self.VideoArr addObject:playerItem];
        }];
           
        //資源轉圖片

        [[PHImageManager defaultManager] requestImageDataForAsset:asset options:nil resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {

             //原圖

            UIImage *image  = [UIImage imageWithData:imageData];

           //縮略圖

            UIImage *ima = [self thumbnailWithImage:image size:CGSizeMake(60, 60)];

           //獲取到視頻封面圖片放入數組（原圖或縮略圖自己選擇吧）

            [self.VideoImageArr addObject:image];
      //主線刷新列表     
            dispatch_async(dispatch_get_main_queue(), ^{
                [self.collectionView reloadData];
            });
            
        }];
   
    });
    }
    

}

#pragma mark --- 獲取所有本地相冊圖片資源

方法跟獲取視頻那個方法一樣，就是有個屬性直接可以獲取（如藍色字體部分）

#pragma mark --- 獲取所有圖片資源
- (void)getPhotoData{
 
    // 獲取所有資源的集合，並按資源的創建時間排序
    PHFetchOptions *options = [[PHFetchOptions alloc] init];
    options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
    PHFetchResult *assetsFetchResults = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:options];
    
    for (NSInteger i = 0; i < assetsFetchResults.count; i++) {
        
        PHAsset *asset = assetsFetchResults[i];
     
    dispatch_async(dispatch_queue_create("com.tany.searchMarkDb", DISPATCH_QUEUE_SERIAL), ^{
            
            // 異步操作
        
        //資源轉圖片
            [[PHImageManager defaultManager] requestImageDataForAsset:asset options:nil resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
                 UIImage * image = [UIImage imageWithData:imageData];
            //縮略圖
                 UIImage *ima = [self thumbnailWithImage:image size:CGSizeMake(60, 60)];
                 [self.arr addObject:ima];
                [self.OrigArr addObject:image];
//                if (self.arr.count == assetsFetchResults.count){
                
                   dispatch_async(dispatch_get_main_queue(), ^{
                        [self.CollectionView reloadData];
                   });
//                }
        }];
        
            });
    }
 
}


#pragma mark - 調用本地攝像機，錄製視頻

  //調起攝相機

-(void)camera{

        UIImagePickerController * PhotoCamera =[[UIImagePickerController alloc]init];
        PhotoCamera.delegate =self;
        PhotoCamera.allowsEditing = YES;
        PhotoCamera.sourceType = UIImagePickerControllerSourceTypeCamera;
        
        PhotoCamera.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
        PhotoCamera.videoQuality = UIImagePickerControllerQualityTypeLow;
        
        [self presentViewController:PhotoCamera animated:YES completion:nil];
        
}

#pragma mark - 代理回調

#pragma mark - UIImagePickerController Delegate

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    NSLog(@"取消");
    [self dismissViewControllerAnimated:YES completion:nil];
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

//獲取視頻路徑  
    NSURL *Url = [info objectForKey:UIImagePickerControllerMediaURL];
    NSString *videoPath = [Url path];

//視頻資源

    NSData *videoData = [NSData dataWithContentsOfFile:videoPath];
     NSLog(@"%@",videoPath);

    //獲取該視頻的封面圖
    UIImage *image = [self getThumbnailImage:videoPath];

 [self dismissViewControllerAnimated:NO completion:nil];

}

//獲取該視頻的封面圖

-(UIImage *)getThumbnailImage:(NSString *)videoPath {
    if (videoPath) {
        
        AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath: videoPath] options:nil];
        AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
        // 設定縮略圖的方向
        // 如果不設定，可能會在視頻旋轉90/180/270°時，獲取到的縮略圖是被旋轉過的，而不是正向的
        gen.appliesPreferredTrackTransform = YES;
        // 設置圖片的最大size(分辨率)
        gen.maximumSize = CGSizeMake(300, 169);
        CMTime time = CMTimeMakeWithSeconds(0.0, 600); //取第0秒，一秒鐘600幀
        NSError *error = nil;
        CMTime actualTime;
        CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
        if (error) {
            UIImage *placeHoldImg = [UIImage imageNamed:@"posters_default_horizontal"];
            return placeHoldImg;
        }
        UIImage *thumb = [[UIImage alloc] initWithCGImage:image];
        CGImageRelease(image);
        return thumb;
    } else {
        UIImage *placeHoldImg = [UIImage imageNamed:@"posters_default_horizontal"];
        return placeHoldImg;
    }
}

//把圖片縮放到指定大小

- (UIImage *)thumbnailWithImage:(UIImage *)image size:(CGSize)asize

{
    
    UIImage *newimage;
    
    if (nil == image) {
        
        newimage = nil;
        
    }
    
    else{
        
        UIGraphicsBeginImageContext(asize);
        
        [image drawInRect:CGRectMake(0, 0, asize.width, asize.height)];
        
        newimage = UIGraphicsGetImageFromCurrentImageContext();
        
        UIGraphicsEndImageContext();
        
    }
    
    return newimage;
    
}

（PS:demo就不給了，學會自己動手