uitabbarcontroller头和身体布局

Question

也许没有办法。我很确定有一种方法可以自定义uitabbarcontroller布局工作。 我的问题是关于在uitabbarcontroller中拥有一个标题和身体。我在tabbarlayout中有以下代码。

tabbarlayout.swift

import UIKit

class TabBarLayout: UITabBarController {
  
  @IBOutlet var viewHeader: UIView!

  override func viewDidLoad() {
    super.viewDidLoad()
    viewHeader.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(viewHeader)
    let leftSide = NSLayoutConstraint(item: viewHeader!, attribute: .left, relatedBy: .equal, toItem: view, attribute: .left, multiplier: 1.0, constant: 0.0)
    let rightSide = NSLayoutConstraint(item: viewHeader!, attribute: .right, relatedBy: .equal, toItem: view, attribute: .right, multiplier: 1.0, constant: 0.0)
    let topSide = NSLayoutConstraint(item: viewHeader!, attribute: .top, relatedBy: .equal, toItem: view, attribute: .top, multiplier: 1.0, constant: 0.0)
    let height = NSLayoutConstraint(item: viewHeader!, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 100)
    view.addConstraint(leftSide)
    view.addConstraint(rightSide)
    view.addConstraint(topSide)
    view.addConstraint(height)
  }
}

tabbar.storyboard故事板的uitabbarcontroller带有故事板参考。

buy.storyboard 购买故事板显示以下屏幕截图：

BUYCONTROLLER.SWIFT

import UIKit

class BuyController: UIViewController {
  
  override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    print("BUYCONTROLLER")
    let tbc = tabBarController as! TabBarLayout
    
    // How do I align this view's topAnchor to viewHeader's bottom anchor?
  }
}

我应该如何使购买故事板的顶部锚与ViewHeader的底部锚点，以便可见测试标签？ ios模拟器的解析

trory在buycontroller.swift的ViewWillAppear中调整Adefalsafeareainsets。这样可以确保视图尊重Viewheader所占的空间。

BUYCONTROLLER.SWIFT：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    let tbc = tabBarController as! TabBarLayout
    
    let headerHeight = tbc.viewHeader.frame.height
    self.additionalSafeAreaInsets.top = headerHeight
}

该方法基于ViewHeader的高度，动态设置了AffearalSafeareAinsets.top。因此，购买Controller的内容从ViewHeader下方开始，防止重叠。

Answer 1