枚举作为块中调用的函数的参数

Question

我编写了一个函数，它将枚举值作为参数。我没有得到函数原型的任何错误，但是一旦我尝试将该函数调用为一个块，就会得到一个错误，说“使用未解析的标识符”：

@IBAction func addButtonPressed(sender: AnyObject) {
    let actionMenu = UIAlertController(title: "Take a Photo or choose an  
    existing one", message: nil, preferredStyle:    
    UIAlertControllerStyle.ActionSheet)

    let takePhotoAction = UIAlertAction(title: "take Photo", style: UIAlertActionStyle.Default, handler: {(alert: UIAlertAction!) -> Void in
        println("take Photo")
    })
    let choosePhotoAction = UIAlertAction(title: "choose an existing Photo", style: UIAlertActionStyle.Default, handler: {(alert: UIAlertAction!) -> Void in
        println("choose Photo")
        //getting error right here    
        self.displayPickerController(UIImagerPickerControllerSourceType.PhotoLibrary)
    })

    actionMenu.addAction(takePhotoAction)
    actionMenu.addAction(choosePhotoAction)

    presentViewController(actionMenu, animated: true, completion: nil)

}


// MARK: - Helper Methods

func displayPickerController(withSource: UIImagePickerControllerSourceType){
    let imagePicker = UIImagePickerController()

    imagePicker.delegate = self
    imagePicker.sourceType = withSource
    presentViewController(imagePicker, animated: true, completion: nil)
}

Answer 1

self.displayPickerController(UIImagerPickerControllerSourceType.PhotoLibrary)中有拼写错误。在命名枚举时，您键入了UIImager而不是UIImage。