我的UIPageViewController一直崩溃

Question

我花了几个小时尝试使用仪器和StackOverFlow进行调试，但没有找到解决方案。 我的UIPageViewController一直崩溃，我真的认为这是因为CPU达到100％，内存可以达到高水平。 但是，我找不到任何阻止以前未显示的View Controller取消分配的变量或任何强引用。 我认为这是PageViewController中的内存问题，但我不确定100％。 我对Swift来说还很陌生，我真的很难尝试首次亮相，因此对您的帮助将不胜感激。 这是我的UIPageViewControllerDataSource的代码。

import UIKit

class HarishIntroduction: UIViewController, UIPageViewControllerDataSource {

var pageViewController: UIPageViewController!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    self.pageViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPageViewController") as! UIPageViewController
    self.pageViewController.dataSource = self
    weak var initialViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishIntroduction") as? HarishIntroduction
    let viewController = NSArray(object: initialViewController!)
    dispatch_async(dispatch_get_main_queue(), {
        self.pageViewController.setViewControllers(viewController as? [UIViewController], direction: .Forward, animated: false, completion: nil)
    })
    self.pageViewController.view.frame = self.view.bounds
    self.addChildViewController(pageViewController)
    self.view.addSubview(self.pageViewController.view)
    self.pageViewController.didMoveToParentViewController(self)
}

func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
    if viewController.isKindOfClass(HarishIntroduction) {
        return nil
    }
    if viewController.isKindOfClass(HarishPlaces) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishIntroduction") as? HarishIntroduction
        return correctViewController
    }
    if viewController.isKindOfClass(WyomingSeminary) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPlaces") as? HarishPlaces
        return correctViewController
    }
    if viewController.isKindOfClass(AppleTree) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("WyomingSeminary") as? WyomingSeminary
        return correctViewController
    }
    if viewController.isKindOfClass(KearneyHighSchool) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("AppleTree") as? AppleTree
        return correctViewController
    }
    if viewController.isKindOfClass(MosconeCenter) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("KearneyHighSchool") as? KearneyHighSchool
        return correctViewController
    }
    else {
        return nil
    }
}

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    if viewController.isKindOfClass(HarishIntroduction) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPlaces") as? HarishPlaces
        return correctViewController
    }
    if viewController.isKindOfClass(HarishPlaces) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("WyomingSeminary") as? WyomingSeminary
        return correctViewController
    }
    if viewController.isKindOfClass(WyomingSeminary) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("AppleTree") as? AppleTree
        return correctViewController
    }
    if viewController.isKindOfClass(AppleTree) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("KearneyHighSchool") as? KearneyHighSchool
        return correctViewController
    }
    if viewController.isKindOfClass(KearneyHighSchool) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("MosconeCenter") as? MosconeCenter
        return correctViewController
    }
    if viewController.isKindOfClass(MosconeCenter) {
        return nil
    }
    else {
        return nil
    }
}

更新：初始视图控制器是“ HarishIntroduction”。

Answer 1

您正在做的事情不是正确的方法，您试图实例化一个UIPageViewController并将初始视图控制器作为视图控制器，而后者又是UIPageViewController的父级。

我在一个单独的类上执行此操作，并且一切正常，尽管在页面控制器层次结构中，我仅创建了两个视图控制器。 您可以添加更多，没有问题。

并且无需在viewDidLoad的main_queue上执行dispatch_async，因为您已经在使用viewDidLoad的main_queue中了，请删除该代码。

import UIKit

class ViewController: UIViewController, UIPageViewControllerDataSource {

var pageViewController: UIPageViewController!
var harishStoryboard:UIStoryboard!

override func viewDidLoad() {
    super.viewDidLoad()

    self.harishStoryboard = self.storyboard

    // Do any additional setup after loading the view.
    self.pageViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPageViewController") as! UIPageViewController
    self.pageViewController.dataSource = self
    let initialViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishIntroduction") as! HarishIntroduction
    let viewController = NSArray(object: initialViewController)

    self.pageViewController.setViewControllers(viewController as? [UIViewController], direction: .Forward, animated: false, completion: nil)
    self.pageViewController.view.frame = self.view.bounds
    self.addChildViewController(pageViewController)
    self.view.addSubview(self.pageViewController.view)
    self.pageViewController.didMoveToParentViewController(self)
}

func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
    if viewController.isKindOfClass(HarishIntroduction) {
        return nil
    }
    if viewController.isKindOfClass(HarishPlaces) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishIntroduction") as? HarishIntroduction
        return correctViewController
    }
    /*if viewController.isKindOfClass(WyomingSeminary) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPlaces") as? HarishPlaces
        return correctViewController
    }
    if viewController.isKindOfClass(AppleTree) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("WyomingSeminary") as? WyomingSeminary
        return correctViewController
    }
    if viewController.isKindOfClass(KearneyHighSchool) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("AppleTree") as? AppleTree
        return correctViewController
    }
    if viewController.isKindOfClass(MosconeCenter) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("KearneyHighSchool") as? KearneyHighSchool
        return correctViewController
    }*/
    else {
        return nil
    }
}

func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
    if viewController.isKindOfClass(HarishIntroduction) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("HarishPlaces") as? HarishPlaces
        return correctViewController
    }
    /*if viewController.isKindOfClass(HarishPlaces) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("WyomingSeminary") as? WyomingSeminary
        return correctViewController
    }
    if viewController.isKindOfClass(WyomingSeminary) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("AppleTree") as? AppleTree
        return correctViewController
    }
    if viewController.isKindOfClass(AppleTree) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("KearneyHighSchool") as? KearneyHighSchool
        return correctViewController
    }
    if viewController.isKindOfClass(KearneyHighSchool) {
        let correctViewController = harishStoryboard.instantiateViewControllerWithIdentifier("MosconeCenter") as? MosconeCenter
        return correctViewController
    }
    if viewController.isKindOfClass(MosconeCenter) {
        return nil
    }*/
    else {
        return nil
    }
}
}

上面的代码对我来说效果很好，如果需要，我可以为您上传项目。