Question

ALAssetsLibrary这些天已被弃用，但几乎所有关于SO的例子仍在使用它。为了我的目标，我需要知道添加到照片库的视频的URL，以便我可以将视频分享到Instagram应用程序（这是Instagram接受视频的唯一方式）。 URL应该以＆＃34; assets-library：//...＆＃34;

开头

ALAssetsLibrary：

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。但是使用PHPhotoLibrary类和performChanges方法与iOS 9兼容的方式呢？

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?
    }
})

Answer 1

以下是我最终的结果：

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
    }
})

Answer 2

很好的答案和伪，谢谢戴斯蒙德。

以下是更新的答案：

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

虽然目前这种情况完美无缺，但如果没有这种“手动”解决方案，有人会知道“更清洁”的方式来获取这个“资产库”网址吗？

我找到了这个interesting thread，但它只提供了一个“file：/// var / ...”网址

获取新创建的资产的URL，iOS 9样式

2 个答案: