ios - ImagePicker 问题并分配给 ImageView

Question

我正在构建一个小应用程序，允许用户选择要附加到帖子的图像。用户选择添加图像(具有点击手势识别器)并显示 iOS 照片库。然后，用户选择图像，所选图像应替换默认的相机图像。从库中选择图像时出现以下错误:2019-03-16 19:13:09.238959-0400 Spirit-App[34772:2211555] [discovery] 发现扩展时遇到的错误:Error Domain= PlugInKit Code=13“查询已取消”UserInfo={NSLocalizedDescription=查询已取消}。我有 info.plist 设置

根据我用于调试的打印语句，我似乎进入了 imageTapped 函数，但从未进入 @objc func imagePickerController。即使我注释掉 @objc func imagePickerController 我仍然收到上面的错误。那么，两个问题:

1. 为什么即使我没有在模式页面上重新分配所选图像，我也会收到错误消息？
2. 如果我解决了这个问题，我拥有的用于分配图像的代码是否可以正常工作或是否需要更改？

代码:

class NewPostViewController: ViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    @IBOutlet weak var newPostImage: UIImageView!
    @IBOutlet weak var postDescription: UITextView!

    let imagePicker = UIImagePickerController()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.clear
        view.isOpaque = false
        imagePicker.delegate = self
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tap:)))
        newPostImage.isUserInteractionEnabled = true
        newPostImage.addGestureRecognizer(tap)
    }

    @objc func imageTapped(tap: UITapGestureRecognizer) {
        print("BUTTON WORKED!")
        imagePicker.allowsEditing = false
        imagePicker.sourceType = .photoLibrary

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

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

        print("Image Picker Complete")
        newPostImage.image = image
        dismiss(animated: true, completion: nil)
    }
}

Answer 1

您的委托(delegate)方法签名错误。

改变:

@objc func imagePickerController(picker: UIImagePickerController!, didFinishPickingImage image: UIImage!, editingInfo: NSDictionary!){

到:

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

您还需要更改该委托(delegate)中的所有代码:

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

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