【发布时间】：2018-07-22 17:31:30
【问题描述】：
我正在寻找如何重新加载 UI 页面控制器。 在表 VC 上，我添加了 UIHeaderView 并嵌入了 UIPage VC。 Page VC 正在从 firebase 动态加载图像。 第一次加载正确的图像集，但是当我在表 VC 上选择其他 cel 时，Page VC 需要刷新其数据。 如何实现这个功能 这是我为 PAGE VC 写的 coed
//-----PAGE VC CODE------
import UIKit
import Firebase
protocol ProductImagesPageVCDelegate: class
{
func setupPageController(numberOfPages: Int)
func turnPageController(to index: Int)
}
class ProductImagesPageVC: UIPageViewController {
var product: Product!
weak var pageViewControllerDelegate: ProductImagesPageVCDelegate?
struct StoryBoard {
static let productImageVC = "ProductImageVC"
}
lazy var controllers: [UIViewController] = {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
var controllers = [UIViewController]()
if let imageLinks = self.product.imageLinks
{
for imageLink in imageLinks
{
let productImageVC = storyboard.instantiateViewController(withIdentifier: StoryBoard.productImageVC)
controllers.append(productImageVC)
}
}
self.pageViewControllerDelegate?.setupPageController(numberOfPages: controllers.count)
return controllers
}()
override func viewDidLoad() {
super.viewDidLoad()
// if #available(iOS 11.0, *) {
// contentInsetAdjustmentBehavior = .never
// } else {
// automaticallyAdjustsScrollViewInsets = false
// }
automaticallyAdjustsScrollViewInsets = false
dataSource = self
delegate = self
self.turnToPage(index: 0)
}
func turnToPage(index: Int)
{
let controller = controllers[index]
var direction = UIPageViewControllerNavigationDirection.forward
if let currentVC = viewControllers?.first
{
guard let currentIndex = controllers.index(of: currentVC) else {return}
if currentIndex > index
{
direction = .reverse
}
}
self.configuewDisplaying(viewController: controller)
setViewControllers([controller], direction: direction, animated: true, completion: nil)
}
func configuewDisplaying(viewController: UIViewController)
{
for (index, vc) in controllers.enumerated()
{
if viewController === vc {
if let productImageVC = viewController as? ProductImageVC
{
productImageVC.imageLink = self.product.imageLinks?[index]
self.pageViewControllerDelegate?.turnPageController(to: index)
}
}
}
}
}
extension ProductImagesPageVC: UIPageViewControllerDataSource
{
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
if let index = controllers.index(of: viewController)
{
if index < controllers.count - 1
{
return controllers[index + 1]
}
}
return controllers.first
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
if let index = controllers.index(of: viewController)
{
if index > 0
{
return controllers[index - 1]
}
}
return controllers.last
}
}
extension ProductImagesPageVC: UIPageViewControllerDelegate
{
func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController]) {
self.configuewDisplaying(viewController: pendingViewControllers.first as! ProductImageVC)
}
func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
if !completed
{
self.configuewDisplaying(viewController: previousViewControllers.first as! ProductImageVC)
}
}
}
【问题讨论】：
-
我已经尝试了一切都不起作用。因为它们被称为目标 c 或旧的 swift 版本
标签： ios swift uipageviewcontroller