ios - 一个 Controller 中的多个图像选择器

Question

我正在为我的应用设计新手入门流程。我想让用户选择一个头像，在 ImageView 中显示该头像，然后选择背景照片并将其显示在另一个 ImageView 中。目前，我已经对所有内容进行了编码，但出于某种原因，当我展示选择器 Controller 时，它默认为化身 Controller 。我想让头像按钮只控制头像按钮背景图片，背景按钮只控制标题图片背景图片。这是我的代码:

 @IBAction func getBackground(sender: AnyObject) {
    let backgroundPickerController = UIImagePickerController()
    backgroundPickerController.delegate = self
    backgroundPickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    backgroundPickerController.allowsEditing = true
    self.presentViewController(backgroundPickerController, animated: true, completion: nil)
}

@IBAction func selectAvatar(sender: AnyObject) {
    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    imagePickerController.allowsEditing = true
    self.presentViewController(imagePickerController, animated: true, completion: nil)
}

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    // set image for button
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage
    self.addAvatar.setImage(image, forState: .Normal)

    // Dismiss controller
    self.dismissViewControllerAnimated(false, completion: nil)
}

func backgroundPickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
  // set image for button
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage
    self.headerImage.image = image
     self.dismissViewControllerAnimated(false, completion: nil)  
}

Answer 1

委托(delegate)函数 imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) 也返回完成选择图像的 UIImagePickerController。

因此您可以使用 if 语句来检查完成的选择器是 pickerOne 还是 pickerTwo。然后根据结果实现不同的行为。

也许在清理一些内存后将选择器设置为 nil。

class multiPickerVC : UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {


    var pickerOne : UIImagePickerController?
    var pickerTwo : UIImagePickerController?


    override func viewDidLoad() {
        //
    }


    @IBAction func getBackground(sender: AnyObject) {
        pickerTwo = UIImagePickerController()
        pickerTwo!.delegate = self
        pickerTwo!.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
        pickerTwo!.allowsEditing = true
        self.presentViewController(pickerTwo!, animated: true, completion: nil)
    }

    @IBAction func selectAvatar(sender: AnyObject) {
        pickerOne = UIImagePickerController()
        pickerOne!.delegate = self
        pickerOne!.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
        pickerOne!.allowsEditing = true
        self.presentViewController(pickerOne!, animated: true, completion: nil)
    }


    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {

        if picker == pickerOne {

            // set image for button
            let image = info[UIImagePickerControllerOriginalImage] as? UIImage
            self.addAvatar.setImage(image, forState: .Normal)

        } else if picker == pickerTwo {

            // set image for button
            let image = info[UIImagePickerControllerOriginalImage] as? UIImage

            self.headerImage.image = image
        }

        self.dismissViewControllerAnimated(true, completion: nil)

    }
}