我现在这是重复的问题,但没有任何解决方案解决我的问题.我是
IOS的新手,我在使用swift 4的项目中使用TabBar控制器.TabBar在
Iphone X上运行完美但设计问题.故事板预览在IphonX上是可以的,但模拟器和设备显示设计问题..查看我的故事板

我没有为TabBar使用任何自定义视图.我还检查了项目中使用过的安全区域布局指南.

我的TabBar控制器代码是

import UIKit

class TabBarSingleton: NSObject {

   static let sharedInstance = TabBarSingleton()
   var tabBarObject : UITabBar?

   override  init(){}
    }

   class TabBarViewController: 
   UITabBarController,UITabBarControllerDelegate {
   let userID =   PSStateManager.sharedManager.userId
   override func viewDidLoad() {
    super.viewDidLoad()
   TabBarSingleton.sharedInstance.tabBarObject = self.tabBar
    for vc in viewControllers!{
        vc.tabBarItem.imageInsets=UIEdgeInsetsMake(-2, 0, +2, 0)
    }
    self.tabBar.unselectedItemTintColor = UIColor.init(hexString: "#5E5E5E")
    self.tabBar.tintColor=UIColor.init(hexString: "#36C4E5")
    self.delegate = self
    self.tabBar.barTintColor = themeColor
    self.tabBar.isTranslucent = false

    self.changeSelectionColor()
    // Do any additional setup after loading the view.
}

override func viewWillAppear(_ animated: Bool) {
   super.viewWillAppear(true)


    patientStatisticCallerFunc(userID: userID!) { (model) in
    return
    }
}


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

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
    let navVC = selectedViewController as! PSNavigationViewController
    navVC.popToRootViewController(animated: false)
    navVC.updateNavBar()
}

func changeSelectionColor() {
    let numberOfItems = CGFloat(tabBar.items!.count)
    let tabBarItemSize = CGSize(width: tabBar.frame.width / numberOfItems, height: tabBar.frame.height)
    tabBar.selectionIndicatorImage = UIImage.imageWithColor(color: UIColor.white, size: tabBarItemSize).resizableImage(withCapInsets: .zero)
    // remove default border
    tabBar.frame.size.width = self.view.frame.width + 4
    tabBar.frame.origin.x = -2
    // tab bar item tint color for selected and unselected and font size
    let colorNormal : UIColor = UIColor.init(hexString: "#5E5E5E")
    let selectedColor : UIColor = UIColor.init(hexString: "#36C4E5")

        let titleFontAll : UIFont = UIFont(name: "segoeui", size: 9.0)!

        let attributesNormal = [
            NSAttributedStringKey.foregroundColor : colorNormal,
            NSAttributedStringKey.font : titleFontAll
        ]

        let attributesSelected = [
            NSAttributedStringKey.foregroundColor : selectedColor,
            NSAttributedStringKey.font : titleFontAll
        ]
        UITabBarItem.appearance().setTitleTextAttributes(attributesNormal, for: .normal)
        UITabBarItem.appearance().setTitleTextAttributes(attributesSelected, for: .selected)
        UITabBarItem.appearance().titlePositionAdjustment = UIOffset(horizontal: 0, vertical: -3)

}

func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
    self.changeSelectionColor()

}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    if #available(iOS 11.0, *) {
        self.tabBar.insetsLayoutMarginsFromSafeArea = true
    }
    self.tabBar.invalidateIntrinsicContentSize()
}
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    let tabViewControllers = tabBarController.viewControllers!
    guard let toIndex = tabViewControllers.index(of: viewController) else {
        return false
    }

    animateToTab(toIndex: toIndex)

    return true
}

func animateToTab(toIndex: Int) {
    let tabViewControllers = viewControllers!
    let fromView = selectedViewController!.view
    let toView = tabViewControllers[toIndex].view
    let fromIndex = tabViewControllers.index(of: selectedViewController!)

    guard fromIndex != toIndex else {return}

    // Add the toView to the tab bar view
    fromView?.superview!.addSubview(toView!)

    // Position toView off screen (to the left/right of fromView)
    let screenWidth = UIScreen.main.bounds.size.width;
    let scrollRight = toIndex > fromIndex!;
    let offset = (scrollRight ? screenWidth : -screenWidth)
    toView?.center = CGPoint(x: (fromView?.center.x)! + offset, y: (toView?.center.y)!)

    // Disable interaction during animation
    view.isUserInteractionEnabled = false

    UIView.animate(withDuration: mediumTranstionDuration, delay: 0.0, usingSpringWithDamping: 1, initialSpringVelocity: 0, options: UIViewAnimationOptions.curveEaseOut, animations: {

        // Slide the views by -offset
        fromView?.center = CGPoint(x: (fromView?.center.x)! - offset, y: (fromView?.center.y)!);
        toView?.center   = CGPoint(x: (toView?.center.x)! - offset, y: (toView?.center.y)!);

    }, completion: { finished in

        // Remove the old view from the tabbar view.
        fromView?.removeFromSuperview()
        self.selectedIndex = toIndex
        self.view.isUserInteractionEnabled = true
    })
}
func changeLabelColors(inView: UIView) {

}
/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

我正面临这个问题

最佳答案 我遇到了同样的问题,并且使用这个类为我的UITabBar解决了,

@IBDesignable class CustomTabBar: UITabBar {

@IBInspectable var height: CGFloat = 0.0

override func sizeThatFits(_ size: CGSize) -> CGSize {
    var sizeThatFits = super.sizeThatFits(size)
    if height > 0.0 {
        sizeThatFits.height = height
        if(isiPhoneXScreen()) {
            sizeThatFits.height = height + 35
        }
    }
    return sizeThatFits
}

}

那么你只需要在故事板中替换CustomTabBar类的普通UITabBar