UIImagePickerController 可以直接在 Story Board 上使用吗？

Question

我的印象是 ViewController 用法类似：在故事板上，我们将 UIViewController 拖到场景上，然后更改其 class 类型，例如到 UIImagePickerController。（我想做一个专门的选图场景）

但是后来发现直接subclass的话UIImagePickerController不行：

class TestUIImagePickerController: UIImagePickerController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.sourceType = .photoLibrary
        self.delegate = self
        // self.present(self, animated: true) // either comment it out or not, both way won't work. 
    }

但只有当我在故事板上放置一个 UIViewController，然后以编程方式构建一个 UIImagePickerController 时它才有效：

class SecondTestUIImagePickerController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()

        let picker = UIImagePickerController()
        picker.sourceType = .photoLibrary
        picker.delegate = self
        self.present(picker, animated: true)
    }

请问我在第一个用法示例中是否遗漏了什么？是否必须以编程方式创建 UIImagePickerController 然后通过代理视图控制器 (UIVIewController) 呈现它？

Answer 1

self.present(self, animated: true)

你不能self展示self，用另一个ViewController展示UIImagePickerController

UIImagePickerController 可以用在故事板上，在你的代码中，例如

class SecondTestUIImagePickerController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        let sb = UIStoryboard(name: "ImagePickerStoryboard", bundle: nil)
        let picker = sb.instantiateViewControllerWithIdentifier("ImagePicker") as! TestUIImagePickerController
        self.present(picker, animated: true)
}

请记住 UIImagePickerController 是 UINavigationController

的子类

UIImagePickerController 可以直接在 Story Board 上使用吗？

Can UIImagePickerController be used directly on story board?

uiimagepickercontroller

ios

swift