[因此,我目前正在使用UIImagePickerController从画廊中挑选视频。我有此代码:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let videoURL = info[UIImagePickerController.InfoKey.mediaURL] as? URL {
MediaManager.shared.sourceType = picker.sourceType
self.metadata.videoURL = videoURL
...
}
else if let asset = info[UIImagePickerController.InfoKey.phAsset] as? PHAsset {
asset.getURL(completionHandler: { url in
self.metadata.videoURL = url
...
})
}
else if let ref = info[UIImagePickerController.InfoKey.phAsset] as? URL {
self.metadata.videoURL = ref
...
}
else {
...
}
}
因此,我保存了视频网址,并根据该网址可以获取视频数据等。
情况是,下次我重新启动该应用程序时,我希望能够再次获得该视频,而无需使用选择器。但似乎我对此没有权限。有什么方法可以向iOS寻求许可,即使我关闭了该应用程序(或者它崩溃了),它也允许我通过其URL打开视频?
编辑:
例如,我得到这样的URL:
file:///private/var/mobile/Containers/Data/Application/AC5AD743-924F-430D-9C34-F3848E4CEE75/tmp/4CBAD829-8764-4234-BCCF-BFA571845D55.MOV
但是在应用被杀死后,我不能真正使用它。因此,如何使用选择器进行选择,并在以后重用。
适应@Michcio的答案,您可以这样做:
选择视频事件:
public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
let mediaType = info[UIImagePickerController.InfoKey.mediaType] as AnyObject
if mediaType as! String == kUTTypeMovie as String {
guard let videoURL = info[UIImagePickerController.InfoKey.mediaURL] as? URL else {
return
}
let bookmarkData: Data
do {
try bookmarkData = videoURL.bookmarkData()
let userDefaults = UserDefaults.standard
userDefaults.set(bookmarkData, forKey: "video")
userDefaults.synchronize()
} catch {
print(error)
}
self.pickerController.dismiss(animated: true, completion: nil)
}
}
重新启动后恢复视频URL:
func getVideo() {
let userDefaults = UserDefaults.standard
guard let decoded = userDefaults.data(forKey: "video") else {
return
}
var videoURL: NSURL
do {
var isSSNField = ObjCBool(true)
try videoURL = NSURL.init(resolvingBookmarkData: decoded, options: .withoutUI, relativeTo: nil, bookmarkDataIsStale: &isSSNField)
print(videoURL)
} catch {
print(error)
}
}
重要:尽管在应用程序运行时可以安全地使用它们,但是文件引用URL在应用程序启动之间不安全地存储和重复使用,因为如果重新启动系统,文件的ID可能会更改。如果要在应用程序启动之间永久存储文件的位置,请按照使用书签查找文件中所述创建书签。
因此,我建议使用bookmarkData(options:includingResourceValuesForKeys:relativeTo:)方法为现有URL创建书签。
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
guard let mediaType = info[.mediaType] as? String,
mediaType == kUTTypeMovie as String,
let url = info[.mediaURL] as? URL else {
return
}
do {
let bookmarkData = try url.bookmarkData()
UserDefaults.standard.set(bookmarkData, forKey: "mediaURL")
} catch {
print("bookmarkData error: \(error)")
}
}
func mediaURL() -> URL? {
guard let urlData = UserDefaults.standard.data(forKey: "mediaURL") else {
return nil
}
var staleData = false
let mediaURL = try? URL(resolvingBookmarkData: urlData, options: .withoutUI, relativeTo: nil, bookmarkDataIsStale: &staleData)
return staleData ? nil : mediaURL
}