EVERYTHING ABOUT PAGEVIEWCONTROLLERS.

PART 1

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Background

This repository documents Part 1 of the multi-part series that implements exhaustive and in-depth concepts about PageViewControllers in iOS.

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Repository Specification

Details about UIPageViewController for this Part

• Transition Style is Page Curl (Interface builder)
• Double sided propery is false (Interface builder)
• Spine location can be min or max (Interface builder)
• Delegate and Data Source are nil
• Gesture based navigation is not included
• Total of 6 View Controllers for this example
• Storyboard IDs in Interface Builder

How to Use

The document has useful content in Main storyboard file and in MainPageViewController.swift file.
Below is the implementation that is used to provide content to PageViewController.

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import UIKit

class MainPageViewController: UIPageViewController {
    
    var currentPageIndexForMinMaxSpine = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        setupMinMaxSpinePageSet()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

/**** ****                                  **** ****
 *  If spine location setting is Min or Max and double sided property is set to false
 *  The above mentioned properties can be setup from Interface Builder. UIPageViewController object's Attributes inspector
 **** ****                                 **** ****/
extension MainPageViewController {
    
    fileprivate func setupMinMaxSpinePageSet() {
        setupViewControllersMinMaxSpine(pageIndex: currentPageIndexForMinMaxSpine)
        
        let minmaxSpineTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(minmaxSpinePageTapped))
        self.view.addGestureRecognizer(minmaxSpineTapGestureRecognizer)
    }
    
    fileprivate func setupViewControllersMinMaxSpine(pageIndex: Int) {
        self.view.isUserInteractionEnabled = false
        
        if pageIndex == GlobalSetup.contentViewControllers.count {
            self.currentPageIndexForMinMaxSpine = 0
            setViewControllers([GlobalSetup.contentViewControllers[0]], direction: .forward, animated: true, completion: {
                print("The success status is: \($0), We are on Page number \(self.currentPageIndexForMinMaxSpine + 1)")
                self.view.isUserInteractionEnabled = true
            })
        } else {
            setViewControllers([GlobalSetup.contentViewControllers[pageIndex]], direction: .forward, animated: true, completion: {
                print("The success status is: \($0), We are on Page number \(pageIndex + 1)")
                self.view.isUserInteractionEnabled = true
            })
        }
    }
    
    @objc func minmaxSpinePageTapped() {
        currentPageIndexForMinMaxSpine += 1
        setupViewControllersMinMaxSpine(pageIndex: currentPageIndexForMinMaxSpine)
    }
    
}


struct GlobalSetup {
    
    static func getViewController(id: String) -> UIViewController! {
        return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: id)
    }
    
    static var contentViewControllers = {
        return ["MyFirstViewController", "MySecondViewController", "MyThirdViewController", "MyFourthViewController", "MyFifthViewController", "MySixthViewController"].map({getViewController(id: $0)!})
    }()
    
}

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Note

The implementation and content providing using dataSource will be implemented in future part of this series.

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