iOS模拟器中导入视频，获取相册视频，视频缩略图

在开发用到视频时，模拟器中往往没有视频可用，下面的方法可以把工程中得视频导入到模拟器中

- (void)saveAction
{
    NSMutableArray *videoArray = [NSMutableArray arrayWithCapacity:3];
    
    NSArray *movs = [[NSBundle mainBundle] pathsForResourcesOfType:@"mov" inDirectory:nil];
    [videoArray addObjectsFromArray:movs];
    
    // save video to camera roll
    for (id item in videoArray) {
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(item)) {
            
            // Note：save to camera roll is async, so the later item may copy complete than previous item
            UISaveVideoAtPathToSavedPhotosAlbum(item, self, nil, NULL);
        }
    }
}

获取相册中得视频

#import

- (void)addMovie

{

    UIImagePickerController *moviePicker = [[UIImagePickerController alloc] init];

    moviePicker.delegate = self;

    moviePicker.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

    moviePicker.allowsEditing = YES;

    moviePicker.mediaTypes = [[NSArray alloc] initWithObjects:(NSString *)kUTTypeMovie, nil];

    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

        moviePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    } else {

        moviePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

    }

    [self presentViewController:moviePicker animated:YES completion:NULL];

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

    //获取图片的NSURL 来源于AssetsLibrary.framework  #import

    NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];

    

    //ALAssetsLibrary 获取图片和视频

    ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc]init];

    

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

        if (url) {

            // 主要方法

            [assetLibrary assetForURL:url resultBlock:^(ALAsset *asset) {

                ALAssetRepresentation *rep = [asset defaultRepresentation];

                Byte *buffer = (Byte*)malloc((unsigned long)rep.size);

                NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:((unsigned long)rep.size) error:nil];

                NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];

                NSString * videoPath = @"沙盒地址";

                [data writeToFile:videoPath atomically:YES];

            } failureBlock:nil];

        }

    });

    

    [picker dismissViewControllerAnimated:YES completion:NULL];

}

获取视频缩略图

+ (UIImage *)getVideoPreViewImage:(NSURL *)videoPath

{

    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoPath options:nil];

    AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];

    gen.appliesPreferredTrackTransform = YES;

    CMTime time = CMTimeMakeWithSeconds(0.0, 10);

    NSError *error = nil;

    CMTime actualTime;

    CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];

    UIImage *img = [[UIImage alloc] initWithCGImage:image];

    CGImageRelease(image);

    return img;

}