thumbnailImageAtTime: now deprecated - What's the alternative?

Managed to find a great way using AVAssetImageGenerator, please see code below...

AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:partOneUrl options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];
[_firstImage setImage:one];
_firstImage.contentMode = UIViewContentModeScaleAspectFit;

Within header file, please import

#import <AVFoundation/AVFoundation.h>

It works perfect and I've been able to call it from viewDidLoad, which was quicker than calling the deprecated thumbNailImageAtTime: from the viewDidAppear.

Hope this helps anyone else who had the same problem.

* **Update for Swift 5.1 ****

Useful function...

    func createThumbnailOfVideoUrl(url: URL) -> UIImage? {
        let asset = AVAsset(url: url)
        let assetImgGenerate = AVAssetImageGenerator(asset: asset)
        assetImgGenerate.appliesPreferredTrackTransform = true

        let time = CMTimeMakeWithSeconds(1.0, preferredTimescale: 600)
        do {
            let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil) 
            let thumbnail = UIImage(cgImage: img)
            return thumbnail
        } catch {
          print(error.localizedDescription)
          return nil
        }
    }

The requestThumbnailImagesAtTimes:timeOption: method will post a MPMoviePlayerThumbnailImageRequestDidFinishNotification notification when an image request completes. Your code that needs the thumbnail image should subscribe to this notification using NSNotificationCenter, and use the image when it receives the notification.

The way to do it, at least in iOS7 is to use floats for your times

NSNumber *timeStamp = @1.f;
[moviePlayer requestThumbnailImagesAtTimes:timeStamp timeOption:MPMovieTimeOptionNearestKeyFrame];

Hope this helps