説明
まだ動画を選択してないとnilで落ちる。
使い用途
動画をトリミングする時のUIが作れたり
実装
import UIKit
import AVKit
import AVFoundation
var int = 0
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
let imagePickerController = UIImagePickerController()
var videoURL: URL?
@IBOutlet weak var imageView: UIImageView!
@IBAction func selectImage(_ sender: Any) {
print("UIBarButtonItem。カメラロールから動画を選択")
imagePickerController.sourceType = .photoLibrary
imagePickerController.delegate = self
//imagePickerController.mediaTypes = ["public.image", "public.movie"]
//動画だけ
imagePickerController.mediaTypes = ["public.movie"]
//画像だけ
//imagePickerController.mediaTypes = ["public.image"]
present(imagePickerController, animated: true, completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
// 一つめのスライダー
let startPointSlider = UISlider(frame: CGRect(x:0, y:0, width:350, height:30))
startPointSlider.layer.position = CGPoint(x:self.view.frame.midX, y:500)
startPointSlider.backgroundColor = UIColor.white
startPointSlider.layer.cornerRadius = 10.0
startPointSlider.layer.shadowOpacity = 0.5
startPointSlider.layer.masksToBounds = false
startPointSlider.addTarget(self, action: #selector(self.onStartPointlabel(_:)), for: .valueChanged)
// 最小値と最大値を設定する.
startPointSlider.minimumValue = 0
startPointSlider.maximumValue = 100
self.view.addSubview(startPointSlider)
//一つめのラベル
let startPointlabel = UILabel()
startPointlabel.text = "start point"
startPointlabel.sizeToFit()
startPointlabel.layer.position = CGPoint(x:self.view.frame.midX, y:450)
self.view.addSubview(startPointlabel)
// 二つめのスライダー
let endPointSlider = UISlider(frame: CGRect(x:0, y:0, width:350, height:30))
endPointSlider.layer.position = CGPoint(x:self.view.frame.midX, y:600)
endPointSlider.backgroundColor = UIColor.white
endPointSlider.layer.cornerRadius = 10.0
endPointSlider.layer.shadowOpacity = 0.5
endPointSlider.layer.masksToBounds = false
endPointSlider.addTarget(self, action: #selector(self.onEndPointlabel(_:)), for: .valueChanged)
// 最小値と最大値を設定する.
endPointSlider.minimumValue = 0
endPointSlider.maximumValue = 100
self.view.addSubview(endPointSlider)
//二つめのラベル
let endPointlabel = UILabel()
endPointlabel.text = "end point"
endPointlabel.sizeToFit()
endPointlabel.layer.position = CGPoint(x:self.view.frame.midX, y:550)
self.view.addSubview(endPointlabel)
}
/*
Sliderの値が変わった時に呼ばれるメソッド
*/
func onStartPointlabel(_ sender:UISlider!)
{
print(floor(sender.value))
int = Int(floor(sender.value))
imageView.image = previewImageFromVideo(videoURL!)!
}
func onEndPointlabel(_ sender:UISlider!)
{
print(floor(sender.value))
int = Int(floor(sender.value))
imageView.image = previewImageFromVideo(videoURL!)!
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
videoURL = info["UIImagePickerControllerReferenceURL"] as? URL
print(videoURL!)
imageView.image = previewImageFromVideo(videoURL!)!
imageView.contentMode = .scaleAspectFit
imagePickerController.dismiss(animated: true, completion: nil)
}
func previewImageFromVideo(_ url:URL) -> UIImage? {
print("動画からサムネイルを生成する")
let asset = AVAsset(url:url)
let imageGenerator = AVAssetImageGenerator(asset:asset)
imageGenerator.appliesPreferredTrackTransform = true
var time = asset.duration
time.value = min(30,32)
do {
let imageRef = try imageGenerator.copyCGImage(at: CMTimeMake(Int64(int), 1), actualTime: nil)
return UIImage(cgImage: imageRef)
} catch {
return nil
}
}
}