发现扩展时遇到Swift 4错误 - 在UI上不会加载照片 [英] Swift 4 errors encountered while discovering extensions - photo will not load on UI

问题描述

当我从照片库中选择照片以在XCode 9.2中填充UIImageView时，我收到以下错误消息：

I am getting the following error message when I choose a photo from the photo library to populate a UIImageView in XCode 9.2:

• [发现扩展时遇到的错误：错误Domain = PlugInKit Code = 13查询已取消UserInfo = {NSLocalizedDescription =查询已取消}

模拟器可以访问照片库，我可以查看照片进行选择，但是当我点击选择选项选择照片时，会抛出错误，并且在选择器被取消后图像是没有填充UIImageView。

The simulator is able to access the photo library and I am able to view the photos to make a selection, but when I click on the 'Choose' option to select a photo, the error is thrown and after the picker is dismissed the image is not populating the UIImageView.

我搜索了Stack Overflow，如果我执行此步骤，我可以摆脱错误消息：从Xcode菜单打开：产品> Scheme> Edit Scheme> On your环境变量在值集disable中设置OS_ACTIVITY_MODE。但是，这只是摆脱了错误，并没有修复我选择的照片没有填充UIImageView的问题。我是Swift和Xcode的新手而且卡住了！请帮忙！

I have searched Stack Overflow and am able to get rid of the error message if I do this step: From Xcode menu open: Product > Scheme > Edit Scheme > On your Environment Variables set OS_ACTIVITY_MODE in the value set disable. However, this only gets rid of the error and does not fix the issue with my selected photo not populating the UIImageView. I am new to Swift and Xcode and am stuck! Please help!

这是我的代码：

import UIKit

class HomeVC: UIViewController, UINavigationControllerDelegate, 
UIImagePickerControllerDelegate {

@IBOutlet weak var avaImg: UIImageView!
@IBOutlet weak var usernameLbl: UILabel!
@IBOutlet weak var fullnameLbl: UILabel!
@IBOutlet weak var emailLbl: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    //get user details from user global var (from database)
    let username = (user!["username"] as? String)?.uppercased()
    let fullname = user!["fullname"] as? String
    let email = user!["email"] as? String
    let ava = user!["ava"] as? String

    //populate labels on view
    usernameLbl.text = username
    fullnameLbl.text = fullname
    emailLbl.text = email


}

@IBAction func edit_click(_ sender: AnyObject) {

    //select ava
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = UIImagePickerControllerSourceType.photoLibrary
    picker.allowsEditing = true
    self.present(picker, animated: true, completion: nil)

    //selected image
    func imagePickerController(_ picker: UIImagePickerController, 
    didFinishPickingMediaWithInfo info: [String : AnyObject]) {
        let image = info[UIImagePickerControllerEditedImage] as? 
           UIImage
        avaImg.image = image

        self.dismiss(animated: true, completion: nil)
        }

    }
}

推荐答案

两个问题：

• didFinishPickingMediaWithInfo 的签名是错误的。在Swift 3+中它是

• The signature of didFinishPickingMediaWithInfo is wrong. In Swift 3+ it is

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

委托方法必须位于类的顶层（不是在另一个方法中） ）

The delegate method must be on the top level of the class (not in another method)

@IBAction func edit_click(_ sender: Any) {

    //select ava
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.sourceType = .photoLibrary
    picker.allowsEditing = true
    self.present(picker, animated: true, completion: nil)
}

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

    //selected image
    let image = info[UIImagePickerControllerEditedImage] as? UIImage
    avaImg.image = image
    self.dismiss(animated: true, completion: nil)
}

这篇关于发现扩展时遇到Swift 4错误 - 在UI上不会加载照片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！