Is there a way to keep the navigation bar across multiple views? - ios

Question

So I have 2 views and when I click on "Go to second view", The navigation bar should be fixed and the only part that should be moving is the view below the Navigation Bar. Is there a possibility that swift allows this either with storyboards or programmatically?

Answer 1

Yes. There is.
1. Create PageViewController.swift and paste the code below there
//
// Copyright © 2018 fewlinesofcode.com All rights reserved.
//
import UIKit
class PageViewController: UIPageViewController {
fileprivate(set) var currentPageIndex: Int = 0
var pages = [UIViewController]()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let firstViewController = page(at: currentPageIndex) {
setViewControllers([firstViewController], direction: .forward, animated: false, completion: { completed in })
}
}
func resetIndex() { currentPageIndex = 0 }
func page(at index: Int) -> UIViewController? {
guard index >= 0 && index < pages.count else { return nil }
return pages[index]
}
}
extension PageViewController: UIPageViewControllerDataSource {
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let pageIndex = pages.index(of: viewController), currentPageIndex != 0 else {
return nil
}
currentPageIndex = pageIndex
currentPageIndex -= 1
return page(at: currentPageIndex)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let pageIndex = pages.index(of: viewController) else {
return nil
}
currentPageIndex = pageIndex + 1
if currentPageIndex == pages.count {
return nil
}
return page(at: currentPageIndex)
}
func presentationCount(for pageViewController: UIPageViewController) -> Int {
return pages.count
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
return currentPageIndex
}
}
extension PageViewController {
func showPrev(completion: ((Bool) -> Void)? = nil) {
guard currentPageIndex > 0 else { return }
currentPageIndex -= 1
setViewControllers([pages[currentPageIndex]], direction: .reverse, animated: true, completion: completion)
}
func showNext(completion: ((Bool) -> Void)? = nil) {
guard currentPageIndex < pages.count - 1 else { return }
currentPageIndex += 1
setViewControllers([pages[currentPageIndex]], direction: .forward, animated: true, completion: completion)
}
}
2. Subclass it like in the sample below:
class ViewController: PageViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
setupChildViewControllers()
}
private func setupChildViewControllers() {
let vc1 = <Instantiate your VC 1>
let vc2 = <Instantiate your VC 2>
pages = [
vc1, vc2
]
}
}
3. Setup navigation
Just embed ViewController in UINavigationController.

Answer 2

Each view controller has it's own navigation bar execution. The only way this would be possible is instead of moving to another view controller, you could create a subclass of UIView, and present a new UIView upon clicking that button by adding it to the subview of the base view controller.