小编Hyo*_*Han的帖子

对不起，我的英语能力很差。

我想在另一个类中访问IBOutlet。我在stackoverflow中发现了许多问题，但是所有答案在我的代码中均不起作用

首先，这是我的代码。

ViewController.swift

import UIKit

class ViewController: UIViewController {

@IBOutlet var MainViewController: UIView! = nil
@IBOutlet var LyricsViewController: UIView! = nil
@IBOutlet var ListViewController: UIView! = nil
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

   showMainViewController()    
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func showMainViewController(){
    MainViewController.alpha = 1
    LyricsViewController.alpha = 0
    ListViewController.alpha = 0
}
func showLyricsViewController(){
    MainViewController.alpha = 0 …