Question

我正在使用UIImagePickerController选择要用来拍摄照片的来源。该图片应设置为UIButton。

我知道您可以通过字符串将UIImage添加到UIButton，例如 someButton.setImage(UIImage(named:...))，但是我需要通过在拍摄照片时创建的变量进行设置。

@IBOutlet weak var addPictureOutlet: UIButton!

func chooseSource() {

    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self


    let kameraAction = UIAlertAction(title: "Kamera",
                                     style: .default) { (action) in
                                        imagePickerController.sourceType = .camera
                                        self.present(imagePickerController, animated: true, completion: nil)
    }

    let libraryAction = UIAlertAction(title: "Galerie",
                                      style: .default) { (action) in
                                        imagePickerController.sourceType = .photoLibrary
                                        self.present(imagePickerController, animated: true, completion: nil)
    }

    let cancelAction = UIAlertAction(title: "Cancel",
                                     style: .cancel)

    let alert = UIAlertController(title: "Quelle",
                                  message: "Wählen sie eine Quelle für die Klausur.",
                                  preferredStyle: .actionSheet)
    alert.addAction(kameraAction)
    alert.addAction(libraryAction)
    alert.addAction(cancelAction)

    self.present(alert, animated: true) {

    }
}

@IBAction func addPicture(_ sender: UIButton) {

    chooseSource()

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        let image1 = info[UIImagePickerController.InfoKey.originalImage] as! UIImage

        addPictureOutlet.setImage(image1, for: .normal)
    }
}

我已经尝试过了，但是我真的无法弄清楚为什么它不起作用，在编译或运行时没有错误，并且UIImage的{{1}}没有变化。

Answer 1

您应该这样使用。您不能在操作中使用功能。

@IBOutlet weak var addPictureOutlet: UIButton!

    func chooseSource() {

        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self


        let kameraAction = UIAlertAction(title: "Kamera",
                                         style: .default) { (action) in
                                            imagePickerController.sourceType = .camera
                                            self.present(imagePickerController, animated: true, completion: nil)
        }

        let libraryAction = UIAlertAction(title: "Galerie",
                                          style: .default) { (action) in
                                            imagePickerController.sourceType = .photoLibrary
                                            self.present(imagePickerController, animated: true, completion: nil)
        }

        let cancelAction = UIAlertAction(title: "Cancel",
                                         style: .cancel)

        let alert = UIAlertController(title: "Quelle",
                                      message: "Wählen sie eine Quelle für die Klausur.",
                                      preferredStyle: .actionSheet)
        alert.addAction(kameraAction)
        alert.addAction(libraryAction)
        alert.addAction(cancelAction)

        self.present(alert, animated: true) {

        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        let image1 = info[UIImagePickerController.InfoKey.originalImage] as! UIImage

        addPictureOutlet.setImage(image1, for: .normal)
    }

    @IBAction func addPicture(_ sender: UIButton) {
        chooseSource()
    }

Answer 2

正如您所说的，它不会进入imagePicker方法，似乎您错过了正确运行imagePicker方法的委托

添加UIImagePickerControllerDelegate并创建一个变量来分配UIImagePickerController var imagePicker = UIImagePickerController() 并设置imagePicker.delegate = self

如何将相机或图库拍摄的图像添加到按钮？

2 个答案: