为 UIImagePicker 设置委托返回错误 [英] Setting delegate for UIImagePicker returns error

问题描述

我为 OCR 翻译应用程序编写的一些快速代码存在问题.代码片段如下:

Having a problem in some swift code I had written for an OCR translation app. The code snippet is below:

@IBAction func btnOCR(sender: AnyObject) {

    var languageAlert = UIAlertController(title: "For Your Information...", message: "The OCR feature currently only supports English & French.", preferredStyle: .Alert)
    languageAlert.addAction(UIAlertAction(title: "Okay", style: .Default, handler: { action in

        var image = UIImagePickerController()
        image.sourceType = UIImagePickerControllerSourceType.Camera
        image.allowsEditing = false
        image.delegate = self
        presentViewController(image, animated: true, completion: nil)

    }))
    self.presentViewController(languageAlert, animated: true, completion: nil)
}

image.delegate = self 行返回错误:Cannot assign a value of viewcontroller to uiimagepickerdelegate.

The image.delegate = self line returns the error: Cannot assign a value of type viewcontroller to uiimagepickerdelegate.

我已经在类定义中设置了委托，如下图...

I have set the delegate in the class definition, this can be seen below...

class ViewController: UIViewController, UITextFieldDelegate, UIPickerViewDelegate, UIPickerViewDataSource, UIImagePickerControllerDelegate {    }

我们将不胜感激，提前致谢.

All and any help would be appreciated, thanks in advance.

推荐答案

你忘记了你的 ViewController 类定义中的 UINavigationControllerDelegate.

You forgot about UINavigationControllerDelegate in your ViewController class defenition.

图像选择器的委托对象.

The image picker’s delegate object.

声明

unowned(unsafe) var delegate: protocol<UIImagePickerControllerDelegate, UINavigationControllerDelegate>?

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