Swift 4.2 imagePickerController 问题答案

【问题标题】：Swift 4.2 imagePickerController issueSwift 4.2 imagePickerController 问题
【发布时间】：2019-01-22 14:23:49
【问题描述】：

尝试将聊天客户端从 swift 4 传递到 swift 4.2 并使用选择器我发现了问题。

UIImagePickerControllerEditedImage 不能下标类型的值 '[String : Any]' 带有类型索引 'UIImagePickerController.InfoKey'

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

    if let pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
        self.userProfileImage.contentMode = .scaleAspectFit
        self.userProfileImage.image = pickedImage
    }

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

【问题讨论】：

标签： swift uiimagepickercontroller swift4.2

【解决方案1】：

方法签名已更改为

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

您应该会看到有关函数名称的警告消息

实例方法 'imagePickerController(:didFinishPickingMediaWithInfo:)' 差不多符合可选要求 'imagePickerController(:didFinishPickingMediaWithInfo:)' 协议 'UIImagePickerControllerDelegate'

候选人的类型不匹配 '(UIImagePickerController, [String : 任意]) -> ()'

将“imagePickerController(_:didFinishPickingMediaWithInfo:)”移动到另一个使此警告静音的扩展

将“imagePickerController(_:didFinishPickingMediaWithInfo:)”设为私有消除此警告

要求'imagePickerController(_:didFinishPickingMediaWithInfo:)' 在这里声明（UIKit.UIImagePickerControllerDelegate）

【讨论】：

和 -> 让 image = info[.editedImage] as? UIImage

【解决方案2】：

在 Swift 4.2 中，imagePickerController 的委托方法发生了一些变化。请查看以下代码。

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

    var selectedImage: UIImage?
    if let editedImage = info[.editedImage] as? UIImage {
        selectedImage = editedImage
        self.profileImage.image = selectedImage!
        picker.dismiss(animated: true, completion: nil)
    } else if let originalImage = info[.originalImage] as? UIImage {
        selectedImage = originalImage
        self.profileImage.image = selectedImage!
        picker.dismiss(animated: true, completion: nil)
    }

}

这肯定会奏效。

【讨论】：

我会移动 self.profileImage.image = selectedImage！ picker.dismiss(animated: true, completion: nil) 在 'if/else' 语句之外。
@Paragon 是的，您可以“picker.dismiss(animated: true, completion: nil)”将其排除在条件之外。谢谢

【解决方案3】：

喜欢这个

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

【讨论】：

【解决方案4】：

Swift4.2

 //MARK:- ImagePicker Controller Delegate
 //MARK:-

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

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

    } else{
        print("Something went wrong")
    }
}

【讨论】：

【解决方案5】：

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

        if let pickedImage = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
            yourImage.image = pickedImage
        }else{
            print("Something went wrong!!")
        }
    }

【讨论】：

【解决方案6】：

extension CameraViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

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

以上代码解决了警告，图片上传成功

【讨论】：

请编辑答案以使用纯文本代码块而不是代码图像。