使用PageMenu框架时控制器出现空白区域的问题求助

Hey there! Let's troubleshoot that annoying blank space you're seeing in your TradingHistoryVC when using PageMenu. Based on the code snippet you shared, here are the most common fixes to resolve this issue:

1. Make Sure Your Controller Array Is Properly Populated #

First, check if you're actually adding valid child view controllers to controllerArray—empty or uninitialized controllers will obviously show blank content. Add this to your viewDidLoad method before initializing PageMenu:

// Example: Load child VCs from storyboard or initialize programmatically
let firstChildVC = self.storyboard?.instantiateViewController(withIdentifier: "FirstChildVC") ?? UIViewController()
firstChildVC.view.backgroundColor = .lightGray // Add a background to test visibility
let secondChildVC = self.storyboard?.instantiateViewController(withIdentifier: "SecondChildVC") ?? UIViewController()
secondChildVC.view.backgroundColor = .systemBlue

controllerArray = [firstChildVC, secondChildVC]

2. Fix PageMenu Frame/Constraint Alignment #

The blank space often happens when PageMenu's view doesn't match the bounds of your pagerView. Instead of hardcoding frames, use Auto Layout to pin PageMenu's view to pagerView completely:

override func viewDidLoad() {
    super.viewDidLoad()
    
    // ... Populate controllerArray first ...
    
    // Configure PageMenu options (adjust these to your needs)
    let pageMenuOptions: [CAPSPageMenuOption] = [
        .menuHeight(44.0),
        .useMenuLikeSegmentedControl(true),
        .selectionIndicatorColor(.systemOrange),
        .menuItemFont(UIFont.systemFont(ofSize: 16, weight: .medium)),
        .viewBackgroundColor(.white)
    ]
    
    // Initialize PageMenu with a temporary frame (we'll use constraints next)
    pageMenu = CAPSPageMenu(viewControllers: controllerArray, frame: pagerView.bounds, pageMenuOptions: pageMenuOptions)
    
    // Add PageMenu's view to pagerView and set full constraints
    guard let pageMenuView = pageMenu?.view else { return }
    pagerView.addSubview(pageMenuView)
    pageMenuView.translatesAutoresizingMaskIntoConstraints = false
    
    NSLayoutConstraint.activate([
        pageMenuView.topAnchor.constraint(equalTo: pagerView.topAnchor),
        pageMenuView.leadingAnchor.constraint(equalTo: pagerView.leadingAnchor),
        pageMenuView.trailingAnchor.constraint(equalTo: pagerView.trailingAnchor),
        pageMenuView.bottomAnchor.constraint(equalTo: pagerView.bottomAnchor)
    ])
}

3. Handle Navigation Bar Translucency #

If your view controller is embedded in a navigation controller, the default translucent navigation bar can push PageMenu's content down, creating a blank top area. Fix this with either of these options:

Option A: Disable Navigation Bar Translucency #

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBar.isTranslucent = false
    // ... rest of your code ...
}

Option B: Adjust Content Inset (If You Need Translucent Bar) #

// After initializing PageMenu
let navBarHeight = self.navigationController?.navigationBar.frame.height ?? 0
pageMenu?.contentScrollView.contentInset = UIEdgeInsets(top: navBarHeight, left: 0, bottom: 0, right: 0)
pageMenu?.contentScrollView.scrollIndicatorInsets = pageMenu?.contentScrollView.contentInset ?? .zero

4. Verify Child View Controllers Have Content #

Double-check that your child view controllers aren't themselves blank. Add a label, image, or set a distinct background color to confirm they're rendering correctly. If the child VC's view is empty, PageMenu will just show that blank space.

Quick Checklist #

• controllerArray has at least 1 valid child VC
• PageMenu's view is fully constrained to pagerView
• Navigation bar translucency is accounted for
• Child VCs have visible content

Try these steps one by one—most likely the issue is with either an empty controller array or misaligned PageMenu constraints.

内容的提问来源于stack exchange，提问作者veerendra pratap singh