ios - 如何将 UIImagePickerController 与委托(delegate)一起使用？

Question

我将 UIView(A 类)作为 xib 实例添加到 ViewController。

我想通过 Action (在A类中)从ViewController类的UIImagePickerController获取图像并将其返回给A类。

我编写了以下代码。但是，我不知道如何回到A类。

我再次向 ViewController 委托(delegate)，但我放弃了它，因为我显示了委托(delegate)的各种错误。 [展开错误...，只是没有移动任何东西...等等]。

// A Class
class A: CustomDelegate{
    var delegate001: PhotoLibraryDelegate!

    class func instance() -> A {
        return UINib(nibName: "A", bundle: nil).instantiate(withOwner: self, options: nil)[0] as! A
    }

    @IBAction func openPhotoLibrary(_ sender: Any) {
        self.delegate001.selectPhoto() //I want photo in A Class XD. so make Delegate!!
    }
}

@objc protocol PhotoLibraryDelegate {
    func selectPhoto()
}

//ViewController Class
class ViewController: PhotoLibraryDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate{
    let a = A.instance()

    override func viewDidLoad() {
        super.viewDidLoad()
        a.delegate006 = self
    }

    func selectPhoto() {
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
            let pickerView = UIImagePickerController()
            pickerView.sourceType = .photoLibrary
            pickerView.delegate = self

            self.present(pickerView, animated: true)
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let image = info[UIImagePickerControllerOriginalImage] as? UIImage // Yeah, I selected the image!!

        self.dismiss(animated: true)

        //... Wa!? I want to return "image" to A class. OMG.
    }
}

Answer 1

最简单的方法是您已经创建了 A 类的实例。现在直接将图像分配给它即可。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage // Yeah, I selected the image!!

    a.imageView.image = image

    self.dismiss(animated: true)


}