获取新创建的资源的URL，iOS 9样式

ALAssetsLibrary

近来已被弃用，但几乎所有的示例都在使用它。为了实现我的目标，我需要知道添加到照片库中的视频的URL，以便我可以将视频共享到Instagram应用程序（这是Instagram接受视频的唯一方式）。URL可能应该以“资产”开头-library://..."

使用

库

，这很简单：

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library writeVideoAtPathToSavedPhotosAlbum:videoFilePath completionBlock:^(NSURL *assetURL, NSError *error) {  // ...

在上面，URL作为参数传递给完成块。但iOS 9与

PHPhotoLibrary

类和

performChanges

方法的兼容方式如何

var videoAssetPlaceholder:PHObjectPlaceholder!  // property

// ...

let videoURL = NSBundle.mainBundle().URLForResource("Video_.mp4", withExtension: nil)!

let photoLibrary = PHPhotoLibrary.sharedPhotoLibrary()
photoLibrary.performChanges({
    let request = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
    self.videoAssetPlaceholder = request?.placeholderForCreatedAsset
},
completionHandler: { success, error in
    if success
    {
        // The URL of the video asset?
    }
})

---

以下是我的结论：

let videoURL = NSBundle.mainBundle().URLForResource("Video_.mp4", withExtension: nil)!

let photoLibrary = PHPhotoLibrary.sharedPhotoLibrary()
var videoAssetPlaceholder:PHObjectPlaceholder!
photoLibrary.performChanges({
    let request = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
    videoAssetPlaceholder = request!.placeholderForCreatedAsset
},
completionHandler: { success, error in
    if success {
        let localID = videoAssetPlaceholder.localIdentifier
        let assetID =
            localID.stringByReplacingOccurrencesOfString(
                "/.*", withString: "",
                options: NSStringCompareOptions.RegularExpressionSearch, range: nil)
        let ext = "mp4"
        let assetURLStr =
            "assets-library://asset/asset.\(ext)?id=\(assetID)&ext=\(ext)"

        // Do something with assetURLStr
    }
})

---

很好的回答和伪，谢谢Desmond

以下是最新的答案：

Swift 3

var assetPlaceholder: PHObjectPlaceholder!
    PHPhotoLibrary.shared().performChanges({
        let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: videoURL as URL!)
        assetPlaceholder = assetRequest?.placeholderForCreatedAsset
    }, completionHandler: { (success, error) in
        if success {
            let localID = assetPlaceholder.localIdentifier
            let assetID = localID.replacingOccurrences(of: "/.*", with: "", options: NSString.CompareOptions.regularExpression, range: nil)
            let ext = "mp4"
            let assetURLStr = "assets-library://asset/asset.\(ext)?id=\(assetID)&ext=\(ext)"

            // Do what you want with your assetURLStr
        } else {
            if let errorMessage = error?.localizedDescription {
                print(errorMessage)
            }
        }
    })

更进一步

尽管目前这种方法非常有效，但如果没有这种“手动”解决方案，有人知道一种“更干净”的方法来获取“资产库”URL吗

---

我找到了这个，但它只提供了一个“file:///var/...“URL

为什么不先将视频保存在本地，然后再共享？@LeoDabus视频共享的方式，Instagram无法从我的应用程序的沙盒中读取视频。