didFinishPickingMediaWithInfo不叫Swift

Question

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并获取图像时，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)}

Answer 1

在Swift 3中，现在调用此委托方法：

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

不同之处是：

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

我有同样的问题，当我做出这些改变时，它起作用了。

Answer 2

1.别忘了添加UIImagePickerControllerDelegate,UINavigationControllerDelegate 2.在你的viewDidLoad()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)
}

希望能帮助到你 ：）

Answer 3

对于swift 4.2

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

Answer 4

使用以下Swift 4.2方法：

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

Answer 5

对于Swift 4.2

此方法已重命名，现在应调用如下。我有同样的问题，这个委托方法没有调用，但在此之后，我的问题解决了。

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

}

Answer 6

对于SWIFT 4.2

当程序没有调用委托方法时，我遇到了类似的问题。

imagePicker.delegate = self应该不在viewDidLoad（）方法中，而是在打开图库的方法中。像这样：

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

        imagePicker.sourceType = .photoLibrary

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

Answer 7

您必须以这种方式使用该方法，因为没有您声明的委托方法：

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：

Answer 8

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

我看到你的imagePickerController.delegate设置正确所以我假设你意外地将didFinishPickingMediaWithInfo代码放在ViewController类之外

Answer 9

有了Swift 5，我们稍作更新。

这是我创建的单屏幕示例，用于测试iOS 12.2

import UIKit
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)
    }
}