我想按特定顺序在标签栏上显示6个图标。为此，我在情节提要中拖动了一个选项卡控制器，并向其中添加了6个视图控制器。我还向每个选项卡栏添加了图像，并为每个选项卡栏制作了不同的视图控制器。
但是问题是图像/视图控制器未按照情节提要中指定的顺序显示。
我还有一个.swift文件用于tabbarcontroller。它具有一些用于配置标签栏的代码，如下所示...
class SampleTabBarController: UITabBarController, UIGestureRecognizerDelegate {
// MARK: - Shared Instance
static var shared: SampleTabBarController?
// MARK: - Public Properties
var homeTitle = "Home"
var connectionsTitle = "Connections"
var flightTitle = "Flights"
var messagesTitle = "Messages"
var companyProfileTitle = "Company Profile"
var myCalendarTitle = "My Calendar"
// MARK: - Private Properties
fileprivate var homeNavigation = "HomeNavigation"
fileprivate var home: HomeViewController? = nil
fileprivate var homeIndex = 0
fileprivate var connectionsNavigation = "ConnectionsNavigation"
fileprivate var connections: ConnectionsViewController? = nil
fileprivate var connectionsIndex = 1
fileprivate var flightsNavigation = "FlightsNavigation"
fileprivate var flights: FlightsViewController? = nil
fileprivate var flightsIndex = 2
fileprivate var messagesNavigation = "MessagesNavigation"
fileprivate var messages: MessagesViewController? = nil
fileprivate var messagesIndex = 3
fileprivate var companyProfileNavigation = "CompanyProfileNavigation"
fileprivate var compProfile: CompanyProfileViewController? = nil
fileprivate var compProfileIndex = 4
fileprivate var myCalendarNavigation = "MyCalendarNavigation"
fileprivate var myCalendar: MyCalendarViewController? = nil
fileprivate var myCalendarIndex = 5
fileprivate var previousIndex = 0
override func viewDidLoad() {
super.viewDidLoad()
SampleTabBarController.shared = self
initialConfiguration()
}
}
extension SampleTabBarController {
private func initialConfiguration() {
self.tabBarController(SampleTabBarController.shared!,
didEndCustomizing: SampleTabBarController.shared!.viewControllers!,
changed: true)
configureViewControllers()
}
fileprivate func configureViewControllers() {
// Home
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == homeNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let homeView = navigation.viewControllers[0] as? HomeViewController {
self.home = homeView
}
}
// Connections
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == connectionsNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let connectionView = navigation.viewControllers[0] as? ConnectionsViewController {
self.connections = connectionView
}
}
// Flight
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == flightsNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let flightView = navigation.viewControllers[0] as? FlightsViewController {
self.flights = flightView
}
}
// Messages
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == messagesNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let messagesView = navigation.viewControllers[0] as? MessagesViewController {
self.messages = messagesView
}
}
// Company Profile
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == companyProfileNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let companyProfileView = navigation.viewControllers[0] as? CompanyProfileViewController {
self.compProfile = companyProfileView
}
}
// My Calendar
if let viewControllers = self.viewControllers {
let navigationControllers = viewControllers.filter { $0.restorationIdentifier == myCalendarNavigation }
if let navigation = navigationControllers.first as? UINavigationController ,
let calendarView = navigation.viewControllers[0] as? MyCalendarViewController {
self.myCalendar = calendarView
}
}
}
}
// MARK: - UITabBarControllerDelegate
extension SampleTabBarController: UITabBarControllerDelegate {
func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
if previousIndex != tabBarController.selectedIndex {
previousIndex = tabBarController.selectedIndex
var elementText = ""
var elementValue = ""
switch previousIndex {
case homeIndex:
elementText = homeTitle
elementValue = BottomBarItems.home.rawValue
case connectionsIndex:
elementText = connectionsTitle
elementValue = BottomBarItems.connections.rawValue
case flightsIndex:
elementText = flightTitle
elementValue = BottomBarItems.flight.rawValue
case messagesIndex:
elementText = messagesTitle
elementValue = BottomBarItems.messages.rawValue
case compProfileIndex:
elementText = companyProfileTitle
elementValue = BottomBarItems.companyProfile.rawValue
case myCalendarIndex:
elementText = myCalendarTitle
elementValue = BottomBarItems.myCalendar.rawValue
default:
break
}
}
}
func tabBarController(_ tabBarController: UITabBarController, didEndCustomizing viewControllers: [UIViewController], changed: Bool) {
for (index, viewcontroller) in viewControllers.enumerated() {
// Home
if viewcontroller.restorationIdentifier == homeNavigation {
homeIndex = index
}
// Connections
if viewcontroller.restorationIdentifier == connectionsNavigation {
connectionsIndex = index
}
// Flight
if viewcontroller.restorationIdentifier == flightsNavigation {
flightsIndex = index
}
// Messages
if viewcontroller.restorationIdentifier == messagesNavigation {
messagesIndex = index
}
// Company Profile
if viewcontroller.restorationIdentifier == companyProfileNavigation {
compProfileIndex = index
}
// My Calendar
if viewcontroller.restorationIdentifier == myCalendarNavigation {
myCalendarIndex = index
}
}
}
}
但这似乎不起作用...我做错了什么...？