所以我有 2 个 View ,当我单击“转到第二个 View ”时,导航栏应该是固定的,唯一应该移动的部分是导航栏下方的 View 。 swift 是否有可能通过 Storyboard或以编程方式允许这样做?
最佳答案
是的。有。
1。创建 PageViewController.swift
并将代码粘贴到下面
//
// 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。像下面的示例一样对其进行子类化:
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。设置导航
只需将 ViewController
嵌入到 UINavigationController
中。
关于ios - 有没有办法让导航栏跨多个 View ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52934910/