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获取某一时刻的UIImage

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代码如下：

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import UIKit
import AVFoundation
import AssetsLibrary

class ViewController: UIViewController {

    override func viewDidLoad() {
        let path = NSBundle.mainBundle().pathForResource("test", ofType: "mov")
        let fileURL = NSURL(fileURLWithPath: path!)
        let avAsset = AVURLAsset(URL: fileURL, options: nil)

        let generator = AVAssetImageGenerator(asset: avAsset)
        generator.maximumSize = self.view.frame.size

        let capturedImage : CGImageRef! = generator.copyCGImageAtTime(avAsset.duration, actualTime: nil, error: nil)

        let imageView = UIImageView(frame: self.view.frame)
        imageView.image = UIImage(CGImage: capturedImage)
        println(avAsset.duration)

        self.view.addSubview(imageView)
    }
}

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