swift - 如何从其他类访问相机代码并稍后重用？

Question

我有一些代码可以访问 UIImagePickerController 并将其保存在图像中。我不想每次要用的时候都重写这个，那么我还能怎么写呢？请原谅，我只是再次将其作为一种爱好。

func startCamera(){
    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.camera
        imagePicker.allowsEditing = true
        self.present(imagePicker, animated: true, completion: nil)
    }

Answer 1

您可以扩展UIViewController，然后您可以通过调用startCamera()在任何UIViewController中访问它。

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        if let imagePicker = startCamera() {
            imagePicker.delegate = self
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        // do something
    }
}

extension UIViewController {
    func startCamera() -> UIImagePickerController? {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
            let imagePicker = UIImagePickerController()
            imagePicker.sourceType = UIImagePickerControllerSourceType.camera
            imagePicker.allowsEditing = true
            present(imagePicker, animated: true, completion: nil)
            return imagePicker
        } else {
            return nil
        }
    }
}