IOS：批量导入图片和视频到模拟器的相册

- (void)saveMediaToCameraRoll
{
    // // traverse the main bundle to find out all image files
    NSMutableArray *picArray = [NSMutableArray arrayWithCapacity:3];
    
    NSArray *jpgFiles = [[NSBundle mainBundle] pathsForResourcesOfType:@"jpg" inDirectory:nil];
    [picArray addObjectsFromArray:jpgFiles];
    
    NSArray *pngArray = [[NSBundle mainBundle] pathsForResourcesOfType:@"png" inDirectory:nil];
    
    // exclude launch image of this project
    NSMutableArray *picExcludeDefault = [NSMutableArray arrayWithArray:pngArray];
    for (NSString *path in pngArray) {
        NSArray *pathCom = [path pathComponents];
        if ([pathCom containsObject:@"Default-568h@2x.png"]
            || [pathCom containsObject:@"Default.png"]
            || [pathCom containsObject:@"Default@2x.png"]) {
            [picExcludeDefault removeObject:path];
        }
    }
    pngArray = picExcludeDefault;
    [picArray addObjectsFromArray:pngArray];
    
    // traverse the main bundle to find out all mov files
    NSMutableArray *videoArray = [NSMutableArray arrayWithCapacity:3];
    
    NSArray *movs = [[NSBundle mainBundle] pathsForResourcesOfType:@"mov" inDirectory:nil];
    [videoArray addObjectsFromArray:movs];
    
    _mediaItemCount = picArray.count + videoArray.count;
    
    if (delegate && [delegate respondsToSelector:@selector(saveToUtilStartCopy:)]) {
        [delegate saveToUtilStartCopy:_mediaItemCount];
    }
    
    // save pic to camera roll
    for (id item in picArray) {
        UIImage *img = [[UIImage alloc] initWithContentsOfFile:item];
        
        // Note：save to camera roll is async, so the later item may copy complete than previous item 
        UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);
        [img release];
    }
    
    // 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, @selector(video:didFinishSavingWithError:contextInfo:), NULL);
        }
        else {
            [self updateProcessWithError:[NSError errorWithDomain:@"copy video error" code:-1 userInfo:nil]];
        }
    }
}