faking it

crazy.swift

// MARK: UIPageViewControllerDataSource

extension PageViewController: UIPageViewControllerDataSource {
    
    func pageViewController(_ pageViewController: UIPageViewController,
        viewControllerBefore viewController: UIViewController) -> UIViewController? {
            guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
                return nil
            }
        
            self.swipeCount = self.swipeCount + 1
            print("swipe count = \(self.swipeCount)")

            let previousIndex = viewControllerIndex - 1
        
            if swipeMode {
                self.swipeMode = true
                print("swipe mode = \(self.swipeMode)")
        
                // User is on the first view controller and swiped left to loop to
                // the last view controller.
                if previousIndex >= 0 {
                    return orderedViewControllers[previousIndex]
                } else {
                    return orderedViewControllers.last
                }
            
            } else {
                self.swipeMode = true
                print("swipe mode = \(self.swipeMode)")
                
                let when = DispatchTime.now() + 1
                DispatchQueue.main.asyncAfter(deadline: when) {
                    
                    if self.swipeCount == 1 {
                        let when = DispatchTime.now() + 4
                        DispatchQueue.main.asyncAfter(deadline: when) {
                            self.swipeMode = false
                            print("swipe mode = \(self.swipeMode)")
                    
                            self.swipeCount = 0
                            print("swipe count = \(self.swipeCount)")
                    
                            self.scrollToViewController(viewController, direction: .forward)
                        }
                 } else {
                    let when = DispatchTime.now() + 4
                    DispatchQueue.main.asyncAfter(deadline: when) {
                        
                        self.swipeMode = false
                        print("swipe mode = \(self.swipeMode)")
                        
                        self.swipeCount = 0
                        print("complete swipe count = \(self.swipeCount)")
                        
                        }
                    }
                }
            }
        
        if orderedViewControllers.count > previousIndex {
            return nil
        } else {
            return orderedViewControllers[previousIndex]
        }
    }

    func pageViewController(_ pageViewController: UIPageViewController,
        viewControllerAfter viewController: UIViewController) -> UIViewController? {
            guard let viewControllerIndex = orderedViewControllers.index(of: viewController) else {
                return nil
            }
        
            self.swipeCount = self.swipeCount + 1
            print("swipe count = \(self.swipeCount)")
        
            let nextIndex = viewControllerIndex + 1
            let orderedViewControllersCount = orderedViewControllers.count

            if swipeMode {
                self.swipeMode = true
                print("swipe mode = \(self.swipeMode)")
                
                // User is on the last view controller and swiped right to loop to
                // the first view controller.
                
                if orderedViewControllersCount != nextIndex {
                    return orderedViewControllers[nextIndex]
                } else {
                
                    return orderedViewControllers.first
                }
            } else {
                self.swipeMode = true
                print("swipe mode = \(self.swipeMode)")
                
                let when = DispatchTime.now() + 1
                DispatchQueue.main.asyncAfter(deadline: when) {
                    if self.swipeCount == 1 {
                        let when = DispatchTime.now() + 4
                        DispatchQueue.main.asyncAfter(deadline: when) {
                    
                            self.swipeMode = false
                            print("swipe mode = \(self.swipeMode)")
                    
                            self.swipeCount = 0
                            print("complete swipe count = \(self.swipeCount)")
                    
                            self.scrollToViewController(viewController, direction: .reverse)
                        }
                    } else {
                        let when = DispatchTime.now() + 4
                        DispatchQueue.main.asyncAfter(deadline: when) {
                            self.swipeMode = false
                            print("swipe mode = \(self.swipeMode)")
                        
                            self.swipeCount = 0
                            print("complete swipe count = \(self.swipeCount)")
                        }
                    }
                }
            }
        
        if orderedViewControllersCount > nextIndex {
            return nil
        } else {
            return orderedViewControllers[nextIndex]
        }
        
        
    }
    
    
}