如何重新加载 UIPageViewController 以在 Swift 中重新加载其视图
Posted
技术标签:
【中文标题】如何重新加载 UIPageViewController 以在 Swift 中重新加载其视图【英文标题】：How to reload UIPageViewController to reload its views in Swift 【发布时间】：2018-12-24 04:02:39 【问题描述】：我正在使用嵌入在表 VC 中的页面控制器。表 VC 显示了项目的详细信息，还包含嵌入的集合视图控制器 一。所以现在当我选择任何集合单元格时，它应该显示选定的单元格项目详细信息。 我能够显示新选定项目的所有内容，但 Page VC 没有根据选定项目图像重新加载，它仍然显示最后一个项目图像。 所以我被困在那里。我附上了 Page VC 和 Detail Table View 的代码 请让我知道这里处理它的方法。提前致谢！！
//-----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)
//-----------Tabel VIEW Controllers-----
import UIKit
class ProductDetailTVC: UITableViewController
@IBOutlet var productImagesHeaderView: ProductImagesHeaderView!
var product: Product!
var products: [Product]?
private var selectedProduct: Product?
struct Storyboard
static let productDetailCell = "ProductDetailCell"
static let buyButtonCell = "BuyButtonCell"
static let showProductDetailCell = "ShowProductDetailCell"
static let suggestionTableCell = "SuggestionTableCell"
static let showImagesPageVC = "ShowProductImagesPageVC"
static let showProductDetail = "ShowProductDetail"
override func viewDidLoad()
super.viewDidLoad()
title = product.name
fetchProducts()
tableView.estimatedRowHeight = tableView.rowHeight
tableView.rowHeight = UITableViewAutomaticDimension
func fetchProducts()
Product.fetchProducts (products) in
self.products = products
if let index = self.products?.index(where: $0 === self.product)
self.products?.remove(at: index)
self.tableView.reloadData()
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int
// #warning Incomplete implementation, return the number of sections
return 1
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
// #warning Incomplete implementation, return the number of rows
return 4
fileprivate func extractedFunc() -> UITableViewCell
return UITableViewCell()
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
if indexPath.row == 0
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.productDetailCell, for: indexPath) as! ProductDetailCell
cell.product = product
cell.selectionStyle = .none
return cell
else if indexPath.row == 1
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.buyButtonCell, for: indexPath) as! BuyButtonCell
cell.product = product
cell.selectionStyle = .none
return cell
else if indexPath.row == 2
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.showProductDetailCell, for: indexPath)
cell.selectionStyle = .none
return cell
else
let cell = tableView.dequeueReusableCell(withIdentifier: Storyboard.suggestionTableCell, for: indexPath) as! SuggestionTableCell
//cell.selectionStyle = .none
return cell
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
if indexPath.row == 3
return tableView.bounds.width + 68
else
return UITableViewAutomaticDimension
//Mark: - UITabeleViewDelegate
override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath)
if indexPath.row == 3
if let cell = cell as? SuggestionTableCell
cell.collectionView.delegate = self
cell.collectionView.dataSource = self
cell.collectionView.reloadData()
cell.collectionView.isScrollEnabled = false
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
if segue.identifier == Storyboard.showImagesPageVC
if let imagesPageVC = segue.destination as? ProductImagesPageVC
imagesPageVC.product = product
imagesPageVC.pageViewControllerDelegate = productImagesHeaderView
//MARK: - UICollectionViewDataSource
extension ProductDetailTVC : UICollectionViewDataSource
func numberOfSections(in collectionView: UICollectionView) -> Int
return 1
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
return 4
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "SuggestionCollectionViewCell", for: indexPath) as! SuggestionCollectionViewCell
guard let products = products else return cell
let randomProduct = Int(arc4random_uniform(UInt32(products.count)))
cell.product = products[randomProduct]
return cell
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
guard let selectedProduct = products?[indexPath.item] else return
self.selectedProduct = selectedProduct
self.product = selectedProduct
navigationItem.title = selectedProduct.name
self.tableView.reloadData()
collectionView.reloadData()
self.reloadInputViews()
//MARK: - UICollectionViewDelegate
extension ProductDetailTVC : UICollectionViewDelegate
//MARK: - UICOLLECTIONVIEWDELEGATEFLOWLAYOUT
extension ProductDetailTVC : UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
if let layout = collectionViewLayout as? UICollectionViewFlowLayout
layout.minimumLineSpacing = 5.0
layout.minimumInteritemSpacing = 2.5
let itemWidth = (collectionView.bounds.width - 5.0) / 2.0
return CGSize(width: itemWidth, height: itemWidth)
return CGSize.zero
【问题讨论】：
任何人都可以提出解决方案？ 【参考方案1】：我假设您希望在更新 product 属性时对其进行更改？
您需要将didSet 添加到更新当前显示的视图控制器的属性中。
【讨论】：
是的..我需要更改新产品vc页面上的图像 能否请您突出显示您所指修改的行的哪一部分代码 任何人都可以在这里提供帮助 你有什么建议吗？ @聪明以上是关于如何重新加载 UIPageViewController 以在 Swift 中重新加载其视图的主要内容，如果未能解决你的问题，请参考以下文章
如何在javascript中单击按钮重新加载网页，但在重新加载调用函数后