Swift 3 - 无法覆盖'imagePickerController'答案

【问题标题】：Swift 3 - Cannot override 'imagePickerController'Swift 3 - 无法覆盖'imagePickerController'
【发布时间】：2016-06-18 08:46:49
【问题描述】：

我的代码：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    self.image = image
    self.imageStatusLabel.text = "There is a picture"
    self.imageStatusLabel.textColor = UIColor.blue()

    picker.dismiss(animated: true, completion: nil)
}

这是错误：

无法覆盖已标记为不可用的“imagePickerController”：在 iOS 7 及更早版本中弃用的 API 在 Swift 中不可用

好吧，我已经尝试使用更新的功能：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    // But no image in the parameters
}

但是，参数中没有图像，我可以获取图像。
我该怎么办？

【问题讨论】：

标签： xcode swift uiimagepickercontroller swift3 xcode8

【解决方案1】：

您必须使用 info 参数并转换为 UIImage。不要忘记您必须在info.plist 文件中输入“Privacy - Photo Library Usage Description”和“Privacy - Camera Usage Description”，并用字符串填充值，说明请求访问照片库和相机的原因。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        pictureImageView.contentMode = .scaleToFill
        pictureImageView.image = pickedImage
    }

    picker.dismiss(animated: true, completion: nil)
}

【讨论】：

【解决方案2】：

要在Swift3 中使用imagePickerController，您需要添加一行键：Privacy - Photo Library Usage Description，值为string（例如：“访问您的照片”）到Info.plist 文件，让我们在下面尝试：

class YourController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    let imagePickerButton: UIButton = {
        let btn = UIButton(frame: CGRect(x: 10, y: 10, width: 100, height: 100))
        btn.setTitle("Choose a Photo", for: .normal)
        btn.setTitleColor(.white, for: .normal)
        btn.backgroundColor = .blue
        btn.addTarget(self, action: #selector(handlePickerDidTap), for: .touchUpInside)

        return btn
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(imagePickerButton)
    }

    func handlePickerDidTap() {
        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.allowsEditing = true
        present(imagePickerController, animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        print("photo is selected")
        // do some thing here
    }

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        dismiss(animated: true, completion: nil)
    }

}

希望对您有所帮助！

【讨论】：

【解决方案3】：

您从传递的info 字典中获取图像，查看documentation 中的键

你可能想要一个

let image = info[UIImagePickerControllerOriginalImage] as? UIImage

或

let image = info[UIImagePickerControllerEditedImage] as? UIImage

【讨论】：

【解决方案4】：

import UIKit
import Photos

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet weak var imageView: UIImageView!

@IBAction func selectPhotoLibrary(_ sender: Any) {
    let picker = UIImagePickerController()
    picker.delegate = self
    if UIImagePickerController.isSourceTypeAvailable(.camera) {
        picker.sourceType = .camera
    } else{
        print("Kamera desteklenmiyor.")
    }
    present(picker, animated: true, completion:nil)
}

@IBAction func selectPhotoCamera(_ sender: Any) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .photoLibrary
    present(picker, animated: true, completion:nil)
}

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    picker.dismiss(animated: true, completion:nil)
    guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }
    guard let imageData = UIImageJPEGRepresentation(image, 0.8) else { return }
    self.imageView.image = image
    print(imageData)
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion:nil)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
}

【讨论】：