arrays - 用户按下按钮(保存)后如何从照片库中打开并选择照片

Question

我到处寻找，但似乎找不到合适的解决方案来保存和使用照片。我正在构建一个基本应用程序，用户必须选择一个图像，稍后将其添加到 UIImage 对象的数组中。该应用程序由一个 TableView 组成，其中包含用户去过的城市和描述。用户可以添加新的城市、描述和图像。添加新图像时，我做了一个alertController

@IBAction func addCity(_ sender: AnyObject) {
    let alertController = UIAlertController(title: "Add new city", message: "", preferredStyle: UIAlertController.Style.alert)

    alertController.addTextField { (textField : UITextField!) -> Void in
        textField.placeholder = "Enter City Name"
    }
    let saveAction = UIAlertAction(title: "Save", style: UIAlertAction.Style.default, handler: { alert -> Void in
        let firstTextField = alertController.textFields![0] as UITextField
        let secondTextField = alertController.textFields![1] as UITextField

        self.newCity = firstTextField.text!
        self.city.addCity(city: self.newCity)

        self.newDescription = secondTextField.text!
        self.fruitTable.reloadData()

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerController.SourceType.photoLibrary
            ){
            print("Button capture")

            var imagePicker = UIImagePickerController()
            imagePicker.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate
            imagePicker.sourceType = UIImagePickerController.SourceType.photoLibrary;
            imagePicker.allowsEditing = false

            self.present(imagePicker, animated: true, completion: nil)
        }

        func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: NSDictionary!){
            self.dismiss(animated: true, completion: { () -> Void in

            })

            self.newImage = image
        }
    })
    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertAction.Style.default, handler: {
        (action : UIAlertAction!) -> Void in })
    alertController.addTextField { (textField : UITextField!) -> Void in
        textField.placeholder = "Enter Description"
    }

    alertController.addAction(saveAction)
    alertController.addAction(cancelAction)

    self.present(alertController, animated: true, completion: nil)
}

通过segue，我将所有信息传输到另一个 View 控件，但是当选择照片时，该信息不会传输。我想知道如何将选定的照片添加到 UIImage 数组中。

如果您愿意，我可以上传我的所有代码，但数量太多了。我知道这看起来很困惑，所以如果您有任何疑问，请询问。谢谢!

Answer 1

您必须符合委托(delegate)，但您只是添加条件转换，但它永远不会起作用。

class MyButtonContainerViewController: UIImagePickerControllerDelegate & UINavigationControllerDelegate {

    @IBAction func addCity(_ sender: AnyObject) {
        ,,,
        imagePicker.delegate = self // No casting needed
        ,,,
    }

    // This is the delegate function and must be in the root of the `Class` (not nested in the `addCity` function)
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picket.dismiss(animated: true, completion: nil)
        let image = info[.originalImage] as! UIImage
        self.newImage = image
        // Append image to the array here
    }
}