[英]How to get thumbnail image of video picked from UIPickerViewController in Swift?
This is how I access the video: 这就是我访问视频的方式:
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
if let videoURL = info[UIImagePickerControllerMediaURL] as? NSURL {
let video = NSData(contentsOfURL: videoURL)
}
}
That video
I would like to show the user in my controller (I do not mean UIDocumentInteractionController
to preview this). 那个
video
我想在我的控制器中显示用户(我不是指UIDocumentInteractionController
来预览这个)。 I need a thumbnail of that video, and then assign this to UIImageView
. 我需要该视频的缩略图,然后将其分配给
UIImageView
。 Is it possible? 可能吗?
The simplest answer: 最简单的答案:
import AVFoundation
private func thumbnailForVideoAtURL(url: NSURL) -> UIImage? {
let asset = AVAsset(URL: url)
let assetImageGenerator = AVAssetImageGenerator(asset: asset)
var time = asset.duration
time.value = min(time.value, 2)
do {
let imageRef = try assetImageGenerator.copyCGImageAtTime(time, actualTime: nil)
return UIImage(CGImage: imageRef)
} catch {
print("error")
return nil
}
}
Here's SWIFT 3.0 using extension 这是使用扩展的SWIFT 3.0
import Foundation
import UIKit
import MediaPlayer
import SystemConfiguration
extension AVAsset{
var videoThumbnail:UIImage?{
let assetImageGenerator = AVAssetImageGenerator(asset: self)
assetImageGenerator.appliesPreferredTrackTransform = true
var time = self.duration
time.value = min(time.value, 2)
do {
let imageRef = try assetImageGenerator.copyCGImage(at: time, actualTime: nil)
let thumbNail = UIImage.init(cgImage: imageRef)
print("Video Thumbnail genertated successfuly".DubugSuccess())
return thumbNail
} catch {
print("error getting thumbnail video".DubugError(),error.localizedDescription)
return nil
}
}
}
Then simply from anywhere you have access to AVAsset/URL : 然后,只需从您有权访问AVAsset / URL的任何地方:
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
if let videoURL = info[UIImagePickerControllerMediaURL] as? NSURL {
let video = NSData(contentsOfURL: videoURL)
//Create AVAsset from url
let ass = AVAsset(url:videoURL)
if let videoThumbnail = ass.videoThumbnail{
print("Success")
}
}
}
You can generate a thumbnail with this method: 您可以使用此方法生成缩略图:
import AVFoundation
func generateThumnail(url : NSURL) -> UIImage?{
let asset: AVAsset = AVAsset(URL: url)
let assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time : CMTime = CMTimeMake(1, 30)
let img : CGImageRef
do {
try img = assetImgGenerate.copyCGImageAtTime(time, actualTime: nil)
let frameImg: UIImage = UIImage(CGImage: img)
return frameImg
} catch {
}
return nil
}
Answer for AiOsN and the way how to fix image rotation. 回答AiOsN以及如何修复图像旋转的方法。 You just need to change this line of code:
您只需要更改以下代码行:
return UIImage(CGImage: imageRef)
to this one: 到这一个:
return UIImage(CGImage: imageRef scale: 1.0 , orientation: UIImageOrientation.Right)
and the image will show you correct rotation. 并且图像将显示正确的旋转。
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