我的 segue 在 imagepicker 中不起作用

Question

我有一个 UIImagePickerController 所以当用户选择 his/her 照片时，segue 被执行但是 segue 不工作（实际上是工作但是 vc 没有加载）这是我的代码：

        let imagepicker = UIImagePickerController()

        imagepicker.delegate = self

        imagepicker.sourceType = UIImagePickerControllerSourceType.photoLibrary

        imagepicker.allowsEditing = true

        self.present(imagepicker, animated: true)
        //...
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
            takenimage = info[UIImagePickerControllerOriginalImage] as! UIImage
            self.dismiss(animated: true, completion: nil)
            print("image loaded")
            performSegue(withIdentifier: "ToPrescriptionView", sender: nil)
        }
        override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
          if segue.identifier == "ToPrescriptionView" {
          let PrescriptionView = segue.destination as! Prescription
          PrescriptionView.PrescriptionImage = takenimage
         print("segue loaded")
        }

我得到 "image loaded" 和 "segue loaded" 但我的 viewcontroller 仍然是以前的

Answer 1

尝试在 dismiss 的完成块中 performSegue 当你关闭 UIImagePickerController 时。

self.dismiss(animated: true) {
     performSegue(withIdentifier: "ToPrescriptionView", sender: nil)
}

我的 segue 在 imagepicker 中不起作用

my segue is not working in imagepicker

xcode

uiimagepickercontroller

segue

swift

swift3