我不知道为什么我不断收到类型“(AnyObject) ->"的错误值()' 没有成员 'currentTitle' [英] I am not sure why I keep getting the error Value of type '(AnyObject) -> ()' has no member 'currentTitle'

问题描述

@IBAction func Hint(_ sender: UIButton) {
        if Action.currentTitle != Int(rightAnswerPlacement) // this is the line where I keep getting error I posted above 
        {
            Action.isHidden = true // true to hide the button
        
        }
    }
    
    @IBOutlet weak var Hint: UIButton!
    
    
    //Label for qs
    @IBOutlet weak var label: UILabel!
    
    //button for choices
    @IBOutlet weak var Action: UIButton!
    
    
    @IBAction func Action(_ sender: AnyObject)
    {
        if (sender.tag == Int(rightAnswerPlacement))
        {
            print("Right")
            
        }
        else
        {
            print("Wrong")
            let alert = UIAlertController(title: "That is incorrect", message: "Try again!", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "Dismiss", style: .cancel, handler: nil))
            present(alert, animated: true)
            currentQuestion -= 1
            //how to record which wrong answer the user is pressing
            //let WrongAnswer = sender.tag.titleLabel?.text
            

        }

这是 Xcode 上的基本测验应用程序的代码，我尝试使用前几行代码尝试在单击另一个按钮后使选项消失

This is a code for a basic quiz app on Xcode, what I am trying to do with my first few lines of code is trying to make an option disappear once I click another button

推荐答案

错误的原因是你的按钮和函数都被命名为 Action.在给您错误的行中，编译器认为您指的是函数(类型为 (AnyObject) -> ())而不是按钮.重命名您的函数或按钮.

Reason for the error is that both your button and a function are named Action. In the line that gives you error, compiler thinks you are referring to the function (which is of type (AnyObject) -> ()) instead of the button. Rename either your function, or your button.

顺便说一下，您应该在代码中改进以下几点:

By the way, there are couple of things you should improve in your code:

• 按照惯例，类型名称大写，而实例名称应小写
• 为变量和函数使用更具描述性的名称 - 即 hintButton 代替 Hint，actionButton 代替 Action> 用于 UIButton 和 actionButtonTapped 用于 func

• by convention, names of types are uppercased, while names of instances should be lowercased
• use more descriptive names for your variables and functions - i.e. hintButton instead of Hint, actionButton instead of Action for UIButton and actionButtonTapped for func

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