如何将视频(在图库中)转换为 NSData?在斯威夫特 [英] How to convert video (in gallery) to NSData? in Swift

问题描述

我只是在 Swift imagePickerController 中没有信息"，所以我不知道如何获取 url 并将其转换为数据以发送到网络服务.

I just haven't "info" in Swift imagePickerController so I don't know how get url and convert it to data to send to web-service.

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {

  var videoDataURL = info[UIImagePickerControllerMediaURL] as! NSURL!
  var videoFileURL = videoDataURL.filePathURL
  var video = NSData.dataWithContentsOfMappedFile("(videoDataURL)")
}

推荐答案

Xcode 10 • Swift 4.2 或更高版本

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    if let url = info[.mediaURL] as? URL {
        do {
            try FileManager.default.moveItem(at: url, to: documentsDirectoryURL.appendingPathComponent("videoName.mov"))
            print("movie saved")
        } catch {
            print(error)
        }
    }
}

---

Xcode 8.3 • Swift 3.1

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
    let documentsDirectoryURL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    if let fileURL =  info[UIImagePickerControllerMediaURL] as? URL {
        do {
            try  FileManager.default.moveItem(at: fileURL, to: documentsDirectoryURL.appendingPathComponent("videoName.mov")
            print("movie saved")
        } catch {
            print(error)
        }
    }
}

---

Swift 2

你应该使用 if let 来打开你的选项.此外 NSData.dataWithContentsOfMappedFile 已弃用 iOS8.尝试使用 NSData 方法初始值设定项 co​​ntentsOfURL:

You should use if let to unwrap your optionals. Also NSData.dataWithContentsOfMappedFile was deprecated iOS8. Try using NSData method initializer contentsOfURL:

注意:您还需要将 didFinishPickingMediaWithInfo 声明从 [NSObject : AnyObject] 更改为 [String : AnyObject]

Note: You need also to change the didFinishPickingMediaWithInfo declaration from [NSObject : AnyObject] to [String : AnyObject]

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    if let fileURL = info[UIImagePickerControllerMediaURL] as? NSURL {
        if let videoData = NSData(contentsOfURL: fileURL) {
            print(videoData.length)
        }
    }
}

正如 Rob 所提到的，数据可能非常大，但您应该将文件移动到文档文件夹中，如下所示:

as mentioned by Rob the data can be really large but instead of copying the file you should move the file to the documents folder as follow:

let documentsDirectoryURL =  try! NSFileManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
if let fileURL =  info[UIImagePickerControllerMediaURL] as? NSURL {
    do {
        try  NSFileManagerdefaultManager().moveItemAtURL(fileURL, toURL: documentsDirectoryURL.URLByAppendingPathComponent("videoName").URLByAppendingPathExtension("mov"))
        print("movie saved")
    } catch {
        print(error)
    }
}

这篇关于如何将视频(在图库中)转换为 NSData?在斯威夫特的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！