转换后，UIPageViewController viewController消失
我在UIPageViewController中嵌入了UINavigationController，而UITabBarController又嵌入了import UIKit
final internal class TabBarController: UITabBarController, ApplicationLoginDelegate {
private let newsFeedTableViewController: NewsFeedTableViewController = NewsFeedTableViewController(style: UITableViewStyle.grouped)
private let substitutionPlanTableViewController: SubstitutionPlanTableViewController = SubstitutionPlanTableViewController(style: UITableViewStyle.grouped)
private let loginTableViewController: LoginTableViewController = LoginTableViewController(style: UITableViewStyle.grouped)
private let timeTableViewController: TimeTablePageViewController = TimeTablePageViewController(transitionStyle: UIPageViewControllerTransitionStyle.scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.horizontal, options: nil)
private let moreTableViewController: MoreTableViewController = MoreTableViewController(style: UITableViewStyle.grouped)
//
// MARK: - Override point
//
/**
Called after the controller's view is loaded into memory.
This method is called after the view controller has loaded its view hierarchy into memory. This method is called regardless of whether the view hierarchy was loaded from a nib file or created programmatically in the loadView() method. You usually override this method to perform additional initialization on views that were loaded from nib files.
*/
override func viewDidLoad() {
super.viewDidLoad()
self.setUpTabBar()
}
/**
Notifies the view controller that its view is about to be added to a view hierarchy.
This method is called before the view controller's view is about to be added to a view hierarchy and before any animations are configured for showing the view. You can override this method to perform custom tasks associated with displaying the view. For example, you might use this method to change the orientation or style of the status bar to coordinate with the orientation or style of the view being presented. If you override this method, you must call super at some point in your implementation.
For more information about the how views are added to view hierarchies by a view controller, and the sequence of messages that occur, see Supporting Accessibility.
*/
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if UIApplication.boolForKey(UserDefaultKey.openSubstitutionPlanOnStartup) == true {
self.selectedViewController = self.viewControllers?[1]
}
}
//
// MARK: - Functions
//
private func setUpTabBar() {
// General
self.tabBar.tintColor = UIColor.applicationBaseColor
self.tabBar.unselectedItemTintColor = UIColor.lightGray
self.tabBar.backgroundColor = UIColor.white
// Create tab bar items
let newsFeedTabBarItem: UITabBarItem = UITabBarItem(title: "Aktuelles", image: #imageLiteral(resourceName: "News"), tag: 0)
let substitutionTabBarItem: UITabBarItem = UITabBarItem(title: "Vertretungen", image: #imageLiteral(resourceName: "SubstitutionPlan"), tag: 1)
let timeTableTabBarItem: UITabBarItem = UITabBarItem(title: "Stundenplan", image: #imageLiteral(resourceName: "TimeTable"), tag: 2)
let moreTabBarItem: UITabBarItem = UITabBarItem(title: "Entdecken", image: #imageLiteral(resourceName: "MoreMenu"), tag: 3)
// Link items and controllers
self.newsFeedTableViewController.tabBarItem = newsFeedTabBarItem
self.substitutionPlanTableViewController.tabBarItem = substitutionTabBarItem
self.loginTableViewController.tabBarItem = substitutionTabBarItem
self.timeTableViewController.tabBarItem = timeTableTabBarItem
self.moreTableViewController.tabBarItem = moreTabBarItem
// Set delegates
self.loginTableViewController.delegate = self
// Set tab bar view controllers
var viewControllers: [UIViewController] = []
if UIApplication.boolForKey(UserDefaultKey.isUserLoggedIn) == true {
viewControllers = [newsFeedTableViewController, substitutionPlanTableViewController, timeTableViewController, moreTableViewController]
} else {
viewControllers = [newsFeedTableViewController, timeTableViewController, moreTableViewController]
}
self.viewControllers = viewControllers.map({ (controller) -> UIViewController in
controller.navigationItem.largeTitleDisplayMode = .always
let navigationController = UINavigationController(rootViewController: controller)
navigationController.navigationBar.prefersLargeTitles = true
return navigationController
})
if UIApplication.boolForKey(UserDefaultKey.isUserLoggedIn) == false {
self.viewControllers?.insert(self.loginTableViewController, at: 1)
}
}
}
。我只是想做到这一点，以便pageViewController循环遍历存储在数组中的viewControllers。但是每当我尝试移动到下一页时，第一个viewController会在消失之前快速回到原位。
我已经将第一个viewController设置为红色，第二个设置为蓝色且非常奇怪，当我在第二个viewController中显示它时加载它们。
这个gif显示了我的意思
我尝试在新项目中以相同的方式设置pageViewController，一切都按预期工作，所以我看不出问题所在。
UITabBarController UIPageViewController和class TimeTablePageViewController: UIPageViewController, UIPageViewControllerDataSource {
private var timeTableViewControllers: [UIViewController]!
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.timeTableViewControllers = Array.init(repeating: UIViewController(), count: 2)
self.timeTableViewControllers[0].view.backgroundColor = .red
self.timeTableViewControllers[1].view.backgroundColor = .blue
self.setViewControllers([self.timeTableViewControllers[0]], direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if let index = self.timeTableViewControllers.index(of: viewController) {
if viewController == self.timeTableViewControllers.first {
return self.timeTableViewControllers.last
} else {
return self.timeTableViewControllers[index - 1]
}
} else {
return nil
}
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if let index = self.timeTableViewControllers.index(of: viewController) {
if viewController == self.timeTableViewControllers.last {
return self.timeTableViewControllers.first
} else {
return self.timeTableViewControllers[index + 1]
}
} else {
return nil
}
}
}
：
Input1 个答案:
答案 0 :(得分：1)
def factors(start, end):
factors = {}
for number in range(start, end + 1):
for i in range(2, number+1):
if number % i == 0:
factors[number] = []
factors[number].append(i)
的{{1}}参数不是闭包。它是用于填充数组的单个对象。
代码不会为其创建的每个元素调用repeatedValue。您正在创建一个包含相同Array.init(repeating repeatedValue: Array.Element, count: Int)实例两次的数组。视图不能有两个superView，因此当您滚动到第二个页面时，UIPageViewController会将唯一的viewController视图添加到其视图中，这意味着它也将从视图中删除。
替换
UIViewController()带
UIViewController- presentModalViewController - ViewController在呈现后自动消失
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