ios Swift - 从远程 URL 下载视频并将其保存在相册中
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原文地址: http://stackoverflow.com/questions/35479903/
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Swift - Download a video from distant URL and save it in an photo album
提问by Melanie Journe
I'm currently displaying a video in my app and I want the user to be able to save it to its device gallery/album photo/camera roll. Here it's what I'm doing but the video is not saved in the album :/
我目前正在我的应用程序中显示视频，我希望用户能够将其保存到其设备画廊/相册照片/相机胶卷中。这是我正在做的，但视频没有保存在相册中：/
func downloadVideo(videoImageUrl:String)
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {
//All stuff here
print("downloadVideo");
let url=NSURL(string: videoImageUrl);
let urlData=NSData(contentsOfURL: url!);
if((urlData) != nil)
{
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0];
let fileName = videoImageUrl; //.stringByDeletingPathExtension
let filePath="\(documentsPath)/\(fileName)";
//saving is done on main thread
dispatch_async(dispatch_get_main_queue(), { () -> Void in
urlData?.writeToFile(filePath, atomically: true);
print("videoSaved");
})
}
})
}
I'va also look into this :
我还研究了这个：
let url:NSURL = NSURL(string: fileURL)!;
PHPhotoLibrary.sharedPhotoLibrary().performChanges({
let assetChangeRequest = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(url);
let assetPlaceHolder = assetChangeRequest!.placeholderForCreatedAsset;
let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection)
albumChangeRequest!.addAssets([assetPlaceHolder!])
}, completionHandler: saveVideoCallBack)
But I have the error "Unable to create data from file (null)". My "assetChangeRequest" is nil. I don't understand as my url is valid and when I go to it with a browser, it download a quick time file.
但是我有错误“无法从文件（空）创建数据”。我的“资产变更请求”为零。我不明白，因为我的 url 是有效的，当我使用浏览器访问它时，它会下载一个快速时间文件。
If anyone can help me, it would be appreciated ! I'm using Swift and targeting iOS 8.0 min.
如果有人可以帮助我，将不胜感激！我正在使用 Swift 并针对 iOS 8.0 分钟。
回答by Nimble
Update
更新
Wanted to update the answer for Swift 3 using URLSession and figured out that the answer already exists in related topic here. Use it.
想使用URLSession来更新斯威夫特3的答案，想通了，答案已经相关主题中存在这里。用它。
Original Answer
原答案
The code below saves a video file to Camera Roll. I reused your code with a minor change - I removed let fileName = videoImageUrl;because it leads to incorrect file path.
下面的代码将视频文件保存到相机胶卷。我重用了你的代码，做了一个小改动 - 我删除了，let fileName = videoImageUrl;因为它会导致不正确的文件路径。
I tested this code and it saved the asset into camera roll. You asked what to place into creationRequestForAssetFromVideoAtFileURL- put a link to downloaded video file as in the example below.
我测试了这段代码并将资产保存到相机胶卷中。您询问要放入什么内容creationRequestForAssetFromVideoAtFileURL- 如下例所示放入下载的视频文件的链接。
let videoImageUrl = "http://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_1mb.mp4"
DispatchQueue.global(qos: .background).async {
if let url = URL(string: urlString),
let urlData = NSData(contentsOf: url) {
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
let filePath="\(documentsPath)/tempFile.mp4"
DispatchQueue.main.async {
urlData.write(toFile: filePath, atomically: true)
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: URL(fileURLWithPath: filePath))
}) { completed, error in
if completed {
print("Video is saved!")
}
}
}
}
}
回答by Yuval Tal
Swift 3 version of the code from @Nimble:
来自@Nimble 的 Swift 3 版本代码：
DispatchQueue.global(qos: .background).async {
if let url = URL(string: urlString),
let urlData = NSData(contentsOf: url)
{
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0];
let filePath="\(documentsPath)/tempFile.mp4"
DispatchQueue.main.async {
urlData.write(toFile: filePath, atomically: true)
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: URL(fileURLWithPath: filePath))
}) { completed, error in
if completed {
print("Video is saved!")
}
}
}
}
}
回答by Jefin Abdul Jaleel
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: video.url!)}) {
saved, error in
if saved {
print("Save status SUCCESS")
}
}
