Question

我正在为带有菜单的应用编写代码，出于某种奇怪的原因，Xcode给了我一个零错误。感谢所有帮助。

//
//  ViewController.swift
//  Menu
//
//  Created by Programmer on 8/1/17.
//  Copyright © 2017 Programmer. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var LeadingConstr1: NSLayoutConstraint!
    @IBOutlet weak var MenuView1: UIView!

    @IBOutlet weak var LeadingConstr2: NSLayoutConstraint!
    @IBOutlet weak var MenuView2: UIView!

    var menushowing1 = false;
    var menushowing2 = false;

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        MenuView1.layer.shadowOpacity = 1
        MenuView1.layer.shadowRadius = 6
        MenuView2.layer.shadowOpacity = 1
        MenuView2.layer.shadowRadius = 6
    }

    @IBAction func MenuBtn(_ sender: Any) {
        if (menushowing1) {
            LeadingConstr1.constant = -140
        }
        else {
            LeadingConstr1.constant = 0
            UIView.animate(withDuration: 0.3, animations: {
                self.view.layoutIfNeeded()
            })

            view.layoutIfNeeded()
        }

        menushowing1 = !menushowing1
    }

    @IBAction func MenuBtn2(_ sender: Any) {
        if (menushowing2) {
            LeadingConstr2.constant = -140
        }
        else {
            LeadingConstr2.constant = 0
            UIView.animate(withDuration: 0.3, animations: {
                self.view.layoutIfNeeded()
            })

            view.layoutIfNeeded()
        }

        menushowing2 = !menushowing2
    }


}

以下是我遇到的错误：

致命错误：在展开Optional值时意外发现nil 2017-08-03 07:18:40.647621-0400菜单[383：53946]致命错误：在解包一个Optional值（lldb） -
时意外地发现了nil

Answer 1

您有一些与任何Menu无关的插座@IBOutlet Menu。从XIB / Storyboard中删除该连接，或在视图控制器中添加该变量。

代码中的未知零值 - 斯威夫特

1 个答案: