Question

在Swift中工作3.我发现了许多问题的答案，然后是博客，但我尝试过的一切都没有用。我只是想拍摄我拍摄的相机并将其保存到文档中。但它没有被保存，因为从xcode中查看时它没有显示在设备文档下，我没有得到任何错误或类似的错误。我在这里有点失落。

用于获取图像并保存图像的代码

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    var pickedImage = UIImage()
    pickedImage = info[UIImagePickerControllerOriginalImage] as! UIImage
    picker.dismiss(animated: true, completion: nil)

    let currentDateTime = Date()
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyyMMddHHmmss"
    let fileNameWithExtension = "ts_\(formatter.string(from: currentDateTime)).png"
    //create path
    let imagePath = fileInDocumentsDirectory(filename: fileNameWithExtension)
    imageStringPathSet = fileNameWithExtension
    imageSet = pickedImage

    if saveImage(image: pickedImage, path: imagePath) {
        cameraButton.setImage(#imageLiteral(resourceName: "ic_camerashot_yes60dp"), for: UIControlState.normal)
        return
    }
    cameraButton.setImage(#imageLiteral(resourceName: "ic_camerashot_no60dp"), for: UIControlState.normal)
}
func fileInDocumentsDirectory(filename: String)-> URL {
    return try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent(filename)
}
func saveImage(image: UIImage, path: URL) -> Bool {
    print(path)
    guard let pngImageData = UIImagePNGRepresentation(image) else {
        print("error")
        return false
    }

    var resultValid = false
    do {
        let results = try pngImageData.write(to: path, options: [.atomicWrite])
        print(results) //prints ()
        resultValid = true
    }
    catch {
        resultValid = false
        print(error)
    }
    return resultValid
}

当我打印它打印的路径时

file:///var/mobile/Containers/Data/Application/01EB6A70-34C6-4481-BE5B-7F7AB5E6703F/Documents/ts_20161221145652.png

我相信这是正确的。如果一切正常，它会更改屏幕上的图像，但它永远不会更改，并且imageStringPathSet也不会设置为类变量。任何人对我需要做些什么都有任何想法才能让它发挥作用？

解决方案

原因是我在viewWillAppear中重置了视图中的所有内容。一旦我修好了，事情就好了。感谢大家的反馈。希望这有助于其他人不做我做的事。

Answer 1

根据评论中的请求，我的代码是（a）使用UIImagePickerController从相机胶卷中选择，然后（b）使用UIActivityViewController让用户选择几种可能的方式来将图像保存/附加到多个输出源。

虽然这不是保存到文档目录，但它可能是更好的选择。代码列表后请注意几个注释。

我的＆＃34;选择＆＃34;视图控制器，允许用户从相机胶卷中选择或拍照：

extension SelectViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    // MARK: Camera App

    func openCameraApp() {
        if UIImagePickerController.availableCaptureModes(for: .rear) != nil {
            picker.allowsEditing = false
            picker.sourceType = UIImagePickerControllerSourceType.camera
            picker.cameraCaptureMode = .photo
            picker.modalPresentationStyle = .fullScreen
            present(picker,
                    animated: true,
                    completion: nil)
        } else {
            noCamera()
        }
    }
    func noCamera(){
        let alertVC = UIAlertController(
            title: "No Camera",
            message: "Sorry, this device has no camera",
            preferredStyle: .alert)
        let okAction = UIAlertAction(
            title: "OK",
            style:.default,
            handler: nil)
        alertVC.addAction(okAction)
        present(
            alertVC,
            animated: true,
            completion: nil)
    }

    // MARK: Photos Albums

    func showImagePicker() {
        picker.allowsEditing = false
        picker.sourceType = .photoLibrary
        //        picker.modalPresentationStyle = .Popover
        present(picker,
                animated: true,
                completion: nil)
        picker.popoverPresentationController?.sourceView = self.view
    }
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage
        image = chosenImage
        self.performSegue(withIdentifier: "ShowEditView", sender: self)
        dismiss(animated: true, completion: nil)
    }
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: false, completion: nil)
    }

    // MARK: Seque to EditViewController

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "ShowEditView" {
            if let vc = segue.destination as? EditViewController {
                vc.image = image
            }
        }
    }
}

我的＆＃34;编辑＆＃34;视图控制器，嵌入在UINavigationBar中，其上的按钮设置为系统项==操作：

// MARK: Image actions

@IBAction func shareImage(_ sender: UIBarButtonItem) {
    let context = CIContext()
    let final = context.createCGImage(imgEdited, from: imgEdited.extent)
    let shareImage = UIImage(cgImage: final!)
    let vc = UIActivityViewController(activityItems: [shareImage], applicationActivities: [])
    vc.excludedActivityTypes =  [
        //UIActivityTypePostToTwitter,
        //UIActivityTypePostToFacebook,
        UIActivityType.postToWeibo,
        //UIActivityTypeMessage,
        //UIActivityTypeMail,
        UIActivityType.print,
        //UIActivityTypeCopyToPasteboard,
        UIActivityType.assignToContact,
        //UIActivityTypeSaveToCameraRoll,
        UIActivityType.addToReadingList,
        //UIActivityTypePostToFlickr,
        UIActivityType.postToVimeo,
        UIActivityType.postToTencentWeibo
    ]
    present(vc,
                            animated: true,
                            completion: nil)
    vc.popoverPresentationController?.sourceView = self.view
    vc.completionWithItemsHandler = {(activity, success, items, error) in
    }
}

注意：

请记住，在iOS 10设备中使用UIImagePickerController时，将崩溃，除非您将其添加到info.plist中：

<key>NSCameraUsageDescription</key>
<string>Used to capture new image for photo effect</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>Used to select an image for photo effect</string>

您可以在标签中使用您想要的任何内容。

UIActivityViewController将在其 excludedActivityTypes 中显示所有评论输出选项。（我保留这些选项只是为了自我记录。）如果用户有Facebook并希望发布到它，他们将被提示登录，如果他们还没有。

Swift 3拍照并保存

1 个答案: