我正在尝试将录制视频的文件路径和缩略图从视频保存到文档目录.然后,使用文件路径将这两个值设置为对象,以便我可以使用该对象填充集合视图.使用我目前(下面)的代码,在录制视频后,视频路径被保存到文档目录,视频路径和缩略图被设置为我的Post对象,缩略图在我的集合视图中正确显示.到目前为止都很好.
但是,只有视频路径在应用程序重新启动之间持续存在,因为它位于目录中,而缩略图则不然.我也想在那里保存缩略图,但我不知道如何去做,因为它似乎只能写入目录的URL.
这是我第一次使用文档目录,所以任何帮助将不胜感激！如何将缩略图(UIImage)与其来自的视频一起写入我的文档目录？
到目前为止,这是我的代码：
func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [String : Any]) {
let mediaType = info[UIImagePickerControllerMediaType] as! NSString
dismiss(animated: true,completion: nil)
if mediaType == kUTTypeMovie {
// Componenets for a unique ID for the video
var uniqueVideoID = ""
var videoURL:NSURL? = NSURL()
var uniqueID = ""
uniqueID = NSUUID().uuidString
// Get the path as URL
videoURL = info[UIImagePickerControllerMediaURL] as? URL as NSURL?
let myVideoVarData = try! Data(contentsOf: videoURL! as URL)
// Write the video to the Document Directory at myVideoVarData (and set the video's unique ID)
let docPaths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory,FileManager.SearchPathDomainMask.userDomainMask,true)
let documentsDirectory: AnyObject = docPaths[0] as AnyObject
uniqueVideoID = uniqueID + "VIDEO.MOV"
let docDataPath = documentsDirectory.appendingPathComponent(uniqueVideoID) as String
try? myVideoVarData.write(to: URL(fileURLWithPath: docDataPath),options: [])
print("docDataPath under picker ",docDataPath)
print("Video saved to documents directory")
// Create a thumbnail image from the video (first frame)
let asset = AVAsset(url: URL(fileURLWithPath: docDataPath))
let assetImageGenerate = AVAssetImageGenerator(asset: asset)
assetImageGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMake(asset.duration.value / 3,asset.duration.timescale)
if let videoImage = try? assetImageGenerate.copyCGImage(at: time,actualTime: nil) {
// Add thumbnail & video path to Post object
let video = Post(pathToVideo: URL(fileURLWithPath: docDataPath),thumbnail: UIImage(cgImage: videoImage))
posts.append(video)
print("Video saved to Post object")
}
}
}
解决方法
就这么简单：
func saveImageToDocumentDirectory(_ chosenImage: UIImage) -> String {
let directoryPath = NSHomeDirectory().appending("/Documents/")
if !FileManager.default.fileExists(atPath: directoryPath) {
do {
try FileManager.default.createDirectory(at: NSURL.fileURL(withPath: directoryPath),withIntermediateDirectories: true,attributes: nil)
} catch {
print(error)
}
}
let filename = NSDate().string(withDateFormatter: yyyytoss).appending(".jpg")
let filepath = directoryPath.appending(filename)
let url = NSURL.fileURL(withPath: filepath)
do {
try UIImageJPEGRepresentation(chosenImage,1.0)?.write(to: url,options: .atomic)
return String.init("/Documents/\(filename)")
} catch {
print(error)
print("file cant not be save at path \(filepath),with error : \(error)");
return filepath
}
}
一个建议：如果可以按照苹果的指南再次下载图像,则将图像保存到库/缓存中.
