未调用 didFinishPickingMediaWithInfo答案

【问题标题】：didFinishPickingMediaWithInfo not called未调用 didFinishPickingMediaWithInfo
【发布时间】：2015-03-22 00:14:47
【问题描述】：

我有一个UITableViewCell 按钮来拍摄图像并将其放回单元格中。当我调用UIImagePickerController 并拍摄图像时，它不会调用以下委托：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject], sender:AnyObject)

这是我在UITableViewController 中的takePhotoFunction：

@IBAction func takePhoto(sender: AnyObject) {
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
imagePickerController.allowsEditing = true

let actionSheet = UIAlertController(title: "Choose image souruce", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)

actionSheet.addAction(UIAlertAction(title: "Take Image", style: UIAlertActionStyle.Default, handler: { (alert:UIAlertAction!) -> Void in
    imagePickerController.sourceType = UIImagePickerControllerSourceType.Camera
    self.presentViewController(imagePickerController, animated: true, completion: nil)
}))

actionSheet.addAction(UIAlertAction(title: "Photo Library", style: UIAlertActionStyle.Default, handler: { (alert:UIAlertAction!) -> Void in
    imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    self.presentViewController(imagePickerController, animated: true, completion: nil)
}))
actionSheet.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))
self.presentViewController(actionSheet, animated: true, completion: nil)}

【问题讨论】：

标签： ios uiimagepickercontroller

【解决方案1】：

在 Swift 3 中，现在调用了这个委托方法：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])

区别在于：

在选择器之前有一个下划线_
最后的信息类型从 [String : AnyObject] 更改为 [String : Any]

我遇到了同样的问题，当我进行这些更改时，它起作用了。

【讨论】：

【解决方案2】：

1.不要忘记添加UIImagePickerControllerDelegate,UINavigationControllerDelegate
2. 在您的viewDidLoad() 中添加picker.delegate = self
3. 添加委托方法

public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage 
        userImageView.contentMode = .scaleAspectFit
        userImageView.image = chosenImage
        dismiss(animated:true, completion: nil)
    }

public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {self.dismiss(animated: true, completion: nil)
}

希望对你有帮助:)

【讨论】：

【解决方案3】：

对于 Swift 4.2

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
   if let chosenImage = info[.originalImage] as? UIImage{
        //use image
    }
}

【讨论】：

UIImage?' is not convertible to 'UIImage'
Cast from 'Slice<Dictionary<UIImagePickerController.InfoKey, Any>>' (aka 'Slice<Dictionary<NSString, Any>>') to unrelated type 'UIImage' always fails

【解决方案4】：

随着 Swift 5 我们有轻微的更新。

这是我创建的单屏示例，用于在 iOS 12.2 上进行测试

import UIKit


class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    @IBOutlet weak var imageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    //MARK: Open Photos Galley Button Action method
    @IBAction func openPhotosGallery(_ sender: Any) {

        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.sourceType = .photoLibrary
            self.present(myPickerController, animated: true, completion: nil)
        }
    }

    //MARK: ImagePicker Controller Delegate methods
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.dismiss(animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        let chosenImage = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
        imageView.image = chosenImage
        dismiss(animated:true, completion: nil)
    }
}

【讨论】：

【解决方案5】：

在 Swift 4.2 中使用以下方法：

public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]){
}

【讨论】：

【解决方案6】：

对于 Swift 4.2

此方法已重命名，现在应按如下方式调用。我遇到了这个委托方法没有调用的相同问题，但在此之后，我的问题解决了。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

}

【讨论】：

【解决方案7】：

对于SWIFT 4.2

当程序未调用委托方法时，我遇到了类似的问题。

imagePicker.delegate = self 应该是 NOT 在 viewDidLoad() 方法中，但在打开画廊的方法中。像这样：

func openGallery()
    {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self

        imagePicker.sourceType = .photoLibrary

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

【讨论】：

【解决方案8】：

您必须以这种方式使用该方法，因为您没有声明任何委托方法：

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info:[NSObject : AnyObject]) {
        println("Calling")       
}

Apple 文档参考：https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIImagePickerControllerDelegate_Protocol/index.html#//apple_ref/occ/intfm/UIImagePickerControllerDelegate/imagePickerController:didFinishPickingMediaWithInfo:

【讨论】：

您好 Dheeraj，感谢您的回答。我已经实现了委托方法，但是在 imagpepickercontroller 完成后，这个方法没有被调用。
您是否使用了我提到的委托方法，因为您的委托方法不正确，并且没有您声明的委托方法。

【解决方案9】：

委托方法现在称为func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])

我看到您的 imagePickerController.delegate 设置正确，所以我假设您不小心将 didFinishPickingMediaWithInfo 代码放在 ViewController 类之外

【讨论】：

【解决方案10】：

如果你的 UIImagePickerController() 对象的 allowEditing 属性设置为 true，那么你应该在委托方法中获取图像：

如果allowsEditing == true

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        if let pickedImage = info[.editedImage] as? UIImage {

              //do something with image

        }

           dismiss(animated: true, completion: nil)

    }

如果allowsEditing == false

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

            if let pickedImage = info[.originalImage] as? UIImage {

                  //do something with image

            }

               dismiss(animated: true, completion: nil)

        }

【讨论】：

【解决方案11】：

也许有时它是由 ARC 引起的？我在控制器中而不是在函数中声明了一个适配器变量（对于下面的 pre-iOS14 存在 UIImagePickerController 或对于 iOS 14+ 存在 PHPickerViewController）。它对我有用。

var adapter: PHPickerAdapter?

@objc func openGallery(recognizer: UITapGestureRecognizer) {
    adapter = PHPickerAdapter()
    adapter?.delegate = self
    adapter?.showPhotoPicker(.photoLibrary, from: self)
}

【讨论】：

【解决方案12】：

在 Swift 5 中我们需要使用：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any])  {

【讨论】：