我在Swift imagePickerController中没有“info”信息，因此不知道如何获取URL并将其转换为数据以发送到Web服务。
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
var videoDataURL = info[UIImagePickerControllerMediaURL] as! NSURL!
var videoFileURL = videoDataURL.filePathURL
var video = NSData.dataWithContentsOfMappedFile("\(videoDataURL)")
}
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
使用if let来解包你的可选项，同时NSData.dataWithContentsOfMappedFile已在iOS8中弃用。试试使用NSData方法initializer contentsOfURL：
注意：你还需要将didFinishPickingMediaWithInfo声明从[NSObject : AnyObject]更改为[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，但是你不应该复制文件，而应该将文件移动到文档文件夹中，方法如下：
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)
}
}
有几个问题：
Consider this line:
var videoDataURL = info[UIImagePickerControllerMediaURL] as! NSURL!
This does a forced unwrapping of info[UIImagePickerControllerMediaURL] (which is bad, because if it was nil, the app would crash) and that casts it as an implicitly unwrapped optional NSURL!. That doesn't make sense. Just do a conditional unwrapping (and unwrap to a NSURL, not a NSURL!):
if let videoDataURL = info[UIImagePickerControllerMediaURL] as? NSURL { ... }
The next line calls filePathURL:
var videoFileURL = videoDataURL.filePathURL
If you wanted a file URL, you already have one, so no conversion is needed, but instead just use videoDataURL. If you really wanted a path, you'd use path method:
let videoPath = videoDataURL.path
Frankly, Apple is trying to shift us away from using string paths, so just use the original videoDataURL and avoid the use of both path and filePathURL.
You are using dataWithContentsOfMappedFile:
var video = NSData.dataWithContentsOfMappedFile("\(videoDataURL)")
If you really wanted to use dataWithContentsOfMappedFile, the proper Swift syntax is:
let video = NSData(contentsOfMappedFile: videoPath!)
But dataWithContentsOfMappedFile deprecated, so you should instead use:
let video = try NSData(contentsOfFile: videoPath!, options: .DataReadingMappedIfSafe)
Or, bypassing that videoPath altogether, you could:
let video3 = try NSData(contentsOfURL: videoDataURL, options: .DataReadingMappedIfSafe)
Obviously, those try renditions should be done within a do block with a catch block.
By the way, as you'll see in all of my above examples, one should use let where possible.
--
坦率地说，我建议根本不要将其加载到 NSData 中。只需使用 NSFileManager 复制即可，这是更有效的内存使用方式。如果视频很长，则可能相当大，因此您应避免在任何给定时间点将其全部加载到内存中。
因此，您可以：
if let videoDataURL = info[UIImagePickerControllerMediaURL] as? NSURL {
do {
// build your destination URL however you want
//
// let tempFolder = NSURL(fileURLWithPath: NSTemporaryDirectory())
// let destinationURL = tempFolder.URLByAppendingPathComponent("test.mov")
// or
let documents = try NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: false)
let destinationURL = documents.URLByAppendingPathComponent("test.mov")
// but just copy from the video URL to the destination URL
try NSFileManager.defaultManager().copyItemAtURL(videoDataURL, toURL: destinationURL)
} catch {
print(error)
}
}
如果您要将此上传到Web服务，则可以使用NSURLSessionUploadTask，并使用文件或流选项。如何构建此请求是一个单独的问题，但希望您能够理解：对于像照片或尤其是视频这样的大型资产，如果可能的话，请勿使用NSData实例化该资产。
InputStream并开始读取内容（可能每次读取10-100kb），为每个50MB块创建一个OutputStream进行写入。然后，您可以对这些单独的文件进行基于文件的上传（非常适合后台URLSession）。但这超出了本问题的范围，因此如果您确实有进一步的问题，请在Stack Overflow上创建自己的问题。 - Robfunc imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
picker.dismiss(animated: true, completion: nil)
print("in here")
if let pickedVideo = info[UIImagePickerController.InfoKey(rawValue: UIImagePickerController.InfoKey.mediaURL.rawValue)] as? URL {
print(pickedVideo)
do {
print("Converted")
// let VideoData = try Data(contentsOf: pickedVideo)
uploadVideo(VideoData: try Data(contentsOf: pickedVideo), URL: pickedVideo)
} catch let error {
print(error.localizedDescription)
}
}
}
寻找简单的解决方案：
public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
self.dismiss(animated: true, completion: nil)
// Using just the information key value
if let url = info[.mediaURL] as? URL {
// Do something with the URL
print("Media URL : ",url)
do {
let videoData = try Data(contentsOf: url)
}
catch let error {
print(error)
}
}
}