如何将 UIPickerViewController 中的图像或视频保存到文档目录?
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【中文标题】如何将 UIPickerViewController 中的图像或视频保存到文档目录?【英文标题】:How to save image or video from UIPickerViewController to document directory? 【发布时间】:2015-11-25 12:33:26 【问题描述】:处理选定的图像或视频:
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
print("ok")
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
//what to do to save that image
else
//how to get the video and save
保存到文档目录:
let path = try! NSFileManager.defaultManager().URLForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomain: NSSearchPathDomainMask.UserDomainMask, appropriateForURL: nil, create: false)
let newPath = path.URLByAppendingPathComponent("image.jpg") //or video.mpg for example
如何将该图像保存到关注newPath
?
【问题讨论】:
【参考方案1】: 使用以下步骤将图像保存到文档目录第一步:获取文档目录的路径
let path = try! NSFileManager.defaultManager().URLForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomain: NSSearchPathDomainMask.UserDomainMask, appropriateForURL: nil, create: false)
第 2 步:在路径中附加文件名
let newPath = path.stringByAppendingPathComponent("image.jpg")
第 3 步:确定图像的文件类型为 JPEG 或 PNG,并将图像转换为数据(字节)
//let pngImageData = UIImagePNGRepresentation(image) // if you want to save as PNG
let jpgImageData = UIImageJPEGRepresentation(image, 1.0) // if you want to save as JPEG
第 4 步:将文件写入创建的路径
let result = jpgImageData!.writeToFile(newPath, atomically: true)
将以上代码添加到您的didFinishPickingImage
函数中。
使用以下函数将视频保存到文档目录
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
// *** store the video URL returned by UIImagePickerController *** //
let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
// *** load video data from URL *** //
let videoData = NSData(contentsOfURL: videoURL)
// *** Get documents directory path *** //
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0]
// *** Append video file name *** //
let dataPath = documentsDirectory.stringByAppendingPathComponent("/videoFileName.mp4")
// *** Write video file data to path *** //
videoData?.writeToFile(dataPath, atomically: false)
【讨论】:
我可以为视频做类似的事情吗?请用视频示例更新您的答案。 是的@BartłomiejSemańczyk 可以,我会更新我的答案。但是您需要使用视频选择器及其代表。相同的委托方法将不起作用。 最后一件事,我们怎么知道那个视频是什么扩展名?我们可以将它与mediaInfo
区别开来吗?
只有在 ios 设备中存储时才会是 .mp4
视频,但您可以从 mediaInfo
字典中的 UIImagePickerControllerMediaURL 中找到它。【参考方案2】:
在 Xcode 8.3.3 中更新已接受的 Swift 3 答案
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
let path = try! FileManager.default.url(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask, appropriateFor: nil, create: false)
let newPath = path.appendingPathComponent("image.jpg")
let jpgImageData = UIImageJPEGRepresentation(image, 1.0)
do
try jpgImageData!.write(to: newPath)
catch
print(error)
else
let videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
let videoData = NSData(contentsOf: videoURL as URL)
let path = try! FileManager.default.url(for: FileManager.SearchPathDirectory.documentDirectory, in: FileManager.SearchPathDomainMask.userDomainMask, appropriateFor: nil, create: false)
let newPath = path.appendingPathComponent("/videoFileName.mp4")
do
try videoData?.write(to: newPath)
catch
print(error)
【讨论】:
【参考方案3】:斯威夫特 5
func getDocumentsDirectory() -> URL
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths[0]
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])
picker.dismiss(animated: true)
guard let image = info[.editedImage] as? UIImage else
print("No image found")
return
// saving to application directory
let imageName = UUID().uuidString
let imagePath = getDocumentsDirectory().appendingPathComponent(imageName)
if let jpegData = image.jpegData(compressionQuality: 0.8)
print("Image Save to path \(imagePath)")
try? jpegData.write(to: imagePath)
【讨论】:
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