ios - UITabBarController，时不时消失最后一项
<p><p>我像往常一样有我的自定义 <code>TabBarController</code>，其中包含 8 个 <code>viewController</code>。</p>
<pre><code>class STTabBarController: UITabBarController,UITabBarControllerDelegate {
let tabBarOrderKey = "tabBarOrderKey"
private var messangerNavigationController: UINavigationController!
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
configureViewControllers()
setUpTabBarItemTags()
getSavedTabBarItemsOrder()
}
func configureViewControllers() {
let clientsController = STClientsViewController(nibName: "STClientsViewController", bundle: nil)
let clientNavigationController = UINavigationController(rootViewController: clientsController)
clientsController.title = "Clients"
clientNavigationController.tabBarItem.image = UIImage(named: "Client")
let openHouseController = STOpenHouseViewController(nibName: "STOpenHouseViewController", bundle: nil)
let openHouseNavigationController = UINavigationController(rootViewController: openHouseController)
openHouseController.title = "Open House"
openHouseNavigationController.tabBarItem.image = UIImage(named: "OpenHouse")
let performanceController = STChartsViewController(nibName: "STChartsViewController", bundle: nil)
let performanceNavigationController = UINavigationController(rootViewController: performanceController)
performanceController.title = "Performance"
performanceNavigationController.tabBarItem.image = UIImage(named: "Performance")
let calculatorsController =STCalculatorsViewController(nibName: "STCalculatorsViewController", bundle: nil)
let calculatorsNavigationController = UINavigationController(rootViewController: calculatorsController)
calculatorsController.title = "Calculators"
calculatorsNavigationController.tabBarItem.image = UIImage(named: "Calculators")
let storyBoard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let communityViewController = storyBoard.instantiateViewController(withIdentifier: "Navigation")
communityViewController.title = "Community"
communityViewController.tabBarItem.image = UIImage (named:"Community")
let industryProfessionalsController = STIndustryProfessionalsViewController(nibName: "STIndustryProfessionalsViewController", bundle: nil)
let industryProfessionalsNavigationController = UINavigationController(rootViewController: industryProfessionalsController)
industryProfessionalsController.title = "Vendors"
industryProfessionalsNavigationController.title = "Vendors"
industryProfessionalsNavigationController.tabBarItem.image = UIImage(named: "Industry-professionals")
let agentResourcesController = STAgentResourcesViewController(nibName: "STAgentResourcesViewController", bundle: nil)
let agentResourcesNavigationController = UINavigationController(rootViewController: agentResourcesController)
agentResourcesController.title = "Resources"
agentResourcesNavigationController.title = "Resources"
agentResourcesNavigationController.tabBarItem.image = UIImage(named: "Agent-Resources")
let settingsController = STSettingsViewController(nibName: "STSettingsViewController", bundle: nil)
let settingsNavigationController = UINavigationController(rootViewController: settingsController)
settingsController.title = "Settings"
settingsNavigationController.tabBarItem.image = UIImage(named: "Settings")
let coachController = STCoachsCornerViewController(nibName: "STCoachsCornerViewController", bundle: nil)
let coachNavigationController = UINavigationController(rootViewController: coachController)
coachController.navigationItem.title = "Action Plan"
coachNavigationController.tabBarItem.title = "Plan"
coachNavigationController.tabBarItem.image = UIImage(named: "Plan")
self.viewControllers =
tabBar.isTranslucent = false
let topBorder = CALayer()
topBorder.frame = CGRect(x: 0, y: 0, width: 1000, height: 0.5)
topBorder.backgroundColor = UIColor.returnRGBColor(r: 229, g: 231, b: 235, alpha: 1).cgColor
tabBar.layer.addSublayer(topBorder)
tabBar.clipsToBounds = true
}
func setUpTabBarItemTags() {
var tag = 0
if let viewControllers = viewControllers {
for view in viewControllers {
view.tabBarItem.tag = tag
tag += 1
}
}
}
func getSavedTabBarItemsOrder() {
var newViewControllerOrder = ()
if let initialViewControllers = viewControllers {
if let tabBarOrder = UserDefaults.standard.object(forKey: tabBarOrderKey) as? {
for tag in tabBarOrder {
newViewControllerOrder.append(initialViewControllers)
}
setViewControllers(newViewControllerOrder, animated: false)
}
}
}
func tabBarController(_ tabBarController: UITabBarController, didEndCustomizing viewControllers: , changed: Bool) {
var orderedTagItems = ()
if changed {
for viewController in viewControllers {
let tag = viewController.tabBarItem.tag
orderedTagItems.append(tag)
}
UserDefaults.standard.set(orderedTagItems, forKey: tabBarOrderKey)
}
}
</code></pre>
<p>当我在不同的设备上启动时遇到了这个问题，有时它会在“更多”选项卡中隐藏设置(最后一个)项目。这看起来有点荒谬，因为代码就像你看到的那样简单明了，而我没有知道这里有什么问题。
smb 知道它是什么吗？谢谢</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>问题在于将此选项卡的顺序保存到用户默认值。
我有 7 个 Controller ，但是当试图保存它时，只保存了 6 个。
这是保存功能的最终代码:</p>
<pre><code>func getSavedTabBarItemsOrder() {
var newViewControllerOrder = ()
if let initialViewControllers = viewControllers {
if let tabBarOrder = UserDefaults.standard.object(forKey: tabBarOrderKey) as? {
for tag in tabBarOrder {
newViewControllerOrder.append(initialViewControllers)
}
let difference = Set(initialViewControllers).subtracting(newViewControllerOrder)
newViewControllerOrder.append(contentsOf: difference)
setViewControllers(newViewControllerOrder, animated: false)
}
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - UITabBarController，时不时消失最后一项，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/51113315/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/51113315/
</a>
</p>
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