Swift 3.2中编程使用jonkykong/SideMenu库，呈现控制器后报错

Hey there, let's figure out why your SideMenu implementation is hitting errors in Swift 3.2. I’ve spent plenty of time working with this library, so let’s break down possible issues and fixes step by step.

First, Validate Your Core Setup #

Looking at your code, there are a few key things to check right off the bat:

• Make sure your menu controller is properly wrapped
  You’re initializing DrawerViewController() directly and assigning it to menuRightNavigationController, but the SideMenu library expects a SideMenuNavigationController instance here (not a plain view controller). If DrawerViewController is your custom menu content screen, you need to wrap it in the library’s navigation controller subclass:

  let menuContentVC = DrawerViewController()
  let menuSlide = SideMenuNavigationController(rootViewController: menuContentVC)
  

• Confirm library compatibility with Swift 3.2
  Double-check that you’re using a version of SideMenu that supports Swift 3.2. If you’re using CocoaPods, your Podfile should specify a compatible release (versions 4.x work with Swift 3.x):

  pod 'SideMenu', '~> 4.0'
  

• Check the order of your configuration calls
  It’s better to initialize and assign the menu navigation controller first, then adjust the SideMenuManager settings. This ensures the manager has a valid menu controller to work with when applying your customizations.

Common Error Scenarios & Fixes #

Let’s cover the most frequent issues that pop up with this setup:

1. Crash with "unrecognized selector" or presentation failure
   This almost always happens when you’re not using a SideMenuNavigationController for the menu. Double-check that menuSlide is an instance of the library’s navigation controller, not just your custom view controller.

2. Menu doesn’t appear, or edge swipe gesture doesn’t work

   • Ensure you’re calling menuAddScreenEdgePanGesturesToPresent(toView: self.view) in the right lifecycle method—viewDidLoad() or viewWillAppear(_:) is ideal. Calling it too early (like in init) means the view isn’t fully loaded yet.
   • Verify that self.view exists when you add the gesture. If your controller isn’t presented yet, the view might not be initialized.

3. Layout glitches or weird animation behavior
   Your animation settings are fine, but if you’re seeing odd visual issues, try resetting to default values first to isolate the problem:

   SideMenuManager.menuAnimationFadeStrength = 0.3 // Default value
   SideMenuManager.menuAnimationTransformScaleFactor = 0.9 // Default value
   

   Then reintroduce your custom values one by one to see which is causing the glitch.

Corrected Example Code #

Here’s a cleaned-up version of your code that fixes the most common pitfalls:

override func viewDidLoad() {
    super.viewDidLoad()
    
    // 1. Initialize your custom menu content controller
    let menuContentVC = DrawerViewController()
    
    // 2. Wrap it in SideMenu's navigation controller
    let menuSlide = SideMenuNavigationController(rootViewController: menuContentVC)
    
    // 3. Configure SideMenuManager settings
    SideMenuManager.menuWidth = 200
    SideMenuManager.menuRightNavigationController = menuSlide
    SideMenuManager.menuFadeStatusBar = false
    SideMenuManager.menuPresentMode = .menuSlideIn
    SideMenuManager.menuAnimationFadeStrength = 0.5
    SideMenuManager.menuAnimationTransformScaleFactor = 1
    
    // 4. Add edge swipe gesture after the view is loaded
    SideMenuManager.menuAddScreenEdgePanGesturesToPresent(toView: self.view)
}

Extra Debugging Tips #

• Check the console for specific errors
  Enable breakpoints and look at the console output—error messages will tell you exactly what’s broken (e.g., missing root controller, incompatible type, etc.).
• Test manual presentation first
  Add a button to manually present the menu to rule out gesture issues:

  @IBAction func openMenuTapped(_ sender: UIButton) {
      guard let menuVC = SideMenuManager.default.menuRightNavigationController else { return }
      present(menuVC, animated: true)
  }
  

  If this works, the problem is with the gesture setup; if not, focus on fixing your menu controller configuration.

内容的提问来源于stack exchange，提问作者user3374675