在 Swift 中为 PageViewController 创建 UICollectionView 数组
Creating an Array of UICollectionViews for PageViewController in Swift
我已经设置了一个 CollectionViewController，它将从数据源创建一个 CollectionView。现在我想使用 PageViewController 在 CollectionView 中滑动，但我不知道如何创建包含 CollectionView 的数组。
到目前为止，我仅通过以下方式展示了其中一个 CollectionView：
let CollectionVC = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! CollectionViewController
CollectionVC.itemStrings = matrixArray[0].makeString()
CollectionVC.columns = problem.columns
CollectionVC.rows = problem.rows
self.present(CollectionVC, animated: true, completion: nil)
呈现一个视图效果很好。
但是现在我需要创建一个可以被 PageViewController 读取的数组来生成 PageView，我该怎么做？我什至不确定 PageViewController 数据源所需的格式，据我从其他教程中可以看出，它应该是 UIViewController 的数组而不是 UICollection[ 类型的数组=62=] 正如我计划的那样，如果是这样的话，我怎样才能使它与 CollectionViews 一起工作？
关于如何创建可用作页面数据源的数组的任何建议ViewController？
更多说明
这是一张它应该如何看的图片：
每个屏幕基本上都是由集合ViewController创建的，页面ViewController组织它们，并可以按照分页指示在这些屏幕中滑动。
//编辑：
感谢 Puneet Sharma 的回答。我确信这已经非常接近我正在寻找的解决方案。但是由于我在编程方面完全是一个自学成才的菜鸟，所以我不太确定将所有这些信息放在哪里。
到目前为止我有 2 个控制器，一个 ViewController:
class ViewController: UIViewController {
//Initialize Variables:
var matrixArray = Array<Matrix>()
var basicArray = Array<Array<Int>>()
var maxArray = Array<Double>()
var currentSolutionArray = Array<Array<Double>>()
var isOptimal = false
var isCyceling = false
var CollectionViewArray: [UICollectionView] = []
//The outlets are for later
@IBOutlet weak var myObjectionFunction: UITextField!
@IBOutlet weak var myConstraint1: UITextField!
@IBOutlet weak var myConstraint1RightSide: UITextField!
@IBOutlet weak var myConstraint2: UITextField!
@IBOutlet weak var myConstraint2RightSide: UITextField!
@IBOutlet weak var myConstraint3: UITextField!
@IBOutlet weak var myConstraint3RightSide: UITextField!
//StartButton
@IBAction func startButton(_ sender: Any) {
//Initializing Objection Function
let objFunction = [-40.0,-30.0,0.0,0.0,0.0,0.0]
// Initializing Nr. of Rows and Columns of the Matrix
let rows = 4
let columns = 6
// Initializing constraints
let constraint0 = [1.0,1.0,1.0,0.0,0.0,8.0]
let constraint1 = [2.0,1.0,0.0,1.0,0.0,12.0]
let constraint2 = [2.0,3.0,0.0,0.0,1.0,18.0]
//Initalize an Array containing all constraints
let constraints = [constraint0, constraint1, constraint2]
//Alternative for use of UserData -> Delete objFuntion, rows, columns, constraint0..2, constraintsArray
//let problem = getData().0
//let constraints = getData.1
let problem = LinearProblem.createLP(rows: rows, columns: columns, objFunction: objFunction, constraints: constraints)
// Initializing Current solution (No need to change anything)
let currentSolution = Array(repeating: 0.0, count: constraints.count)
print("Initial Problem: ")
print(problem)
print("\n")
let solution = PrimalSimplex(problem: problem, currentSolution: currentSolution)
matrixArray = solution.0
basicArray = solution.1
maxArray = solution.2
currentSolutionArray = solution.3
isOptimal = solution.4
isCyceling = solution.5
let CollectionVC = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! CollectionViewController
CollectionVC.itemStrings = matrixArray[0].makeString()
CollectionVC.columns = problem.columns
CollectionVC.rows = problem.rows
self.present(CollectionVC, animated: true, completion: nil)
}
}
它基本上是一个带有开始按钮的屏幕，当它被按下时会启动算法并显示下一个视图。
然后是这个合集ViewController:
class CollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var myCollectionView: UICollectionView!
//Is also set in Storyboard
let reuseIdentifier = "cell"
var itemStrings: Array<String?> = []
var rows: Int = 0
var columns: Int = 0
//
//Setup CollectionView: Table to display LPs including Datasource
//
// MARK: - UICollectionViewDelegate protocol
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
// handle tap events
let newPath = indexPath.item + 1
print("You selected cell #\(newPath)")
}
// calculate height and width of cell
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.bounds.width
let gaps = columns-1
let tmpWidth = width - CGFloat(gaps)
let itemWidth = tmpWidth / CGFloat(columns)
let height = collectionView.bounds.height
let tmpHeight = height - CGFloat(gaps)
let itemHeight = tmpHeight / CGFloat(rows)
return CGSize(width: itemWidth, height: itemHeight)
}
// CellSpacing vertical
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(3)
}
// CellSpacing horizontal
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(1)
}
// change background color when user touches cell
func collectionView(_ collectionView: UICollectionView, didHighlightItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
//Change color
if cell?.backgroundColor == UIColor(red:0.96, green:0.40, blue:0.40, alpha:1.0) {
cell?.backgroundColor = UIColor(red:0.94, green:0.94, blue:0.94, alpha:1.0)
}
else{
cell?.backgroundColor = UIColor(red:0.96, green:0.40, blue:0.40, alpha:1.0)
}
}
// MARK: - UICollectionViewDataSource protocol
// tell the collection view how many cells to make
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
let numberOfItems = rows*columns
return numberOfItems
}
// make a cell for each cell index path
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// get a reference to our storyboard cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
// Use the outlet in our custom class to get a reference to the UILabel in the cel
cell.myLabel.text = itemStrings[indexPath.item]
cell.backgroundColor = UIColor(red:0.94, green:0.94, blue:0.94, alpha:1.0)
// Change shape of cells
cell.layer.cornerRadius = 8
return cell
}
}
这些也是目前我故事板中仅有的元素。
我想我需要在 Storyboard 中添加 PageViewController 并用你的 HomeViewController 代码填充它。然后将 Storyboard 中的 segue 从开始按钮更改为 HomeViewController.
我不明白的部分是将要创建的ChildVC。我需要将该部分添加到我的 ViewController 吗？那么 IndexedCollectionViewController class 呢？我是否需要为此创建一个额外的文件，或者我是否可以将其放入我的 collectionView 某处？
那么这个函数呢
private func viewController(atIndex index:Int) -> IndexedCollectionViewController
那去哪儿了？我认为在我的情况下会在 ViewController class 中，我只是调用开始按钮中的方法 ?
很抱歉提出所有这些非常简单的问题，但作为一个自学成才的编码员，有时很难掌握事物背后的概念 ^^
在我看来，UIPageViewController 文档有点含糊。
争论的焦点是一种方法的存在：
func setViewControllers(_ viewControllers: [UIViewController]?,
direction: UIPageViewControllerNavigationDirection,
animated: Bool,
completion: ((Bool) -> Void)? = nil)
所有教程都在这个数组中传递一个视图控制器，它们是正确的of-course。但是因为这个方法的存在，我假设我可以把所有需要显示的视图控制器放在一个数组中到 pageviewcontroller.
但是，实际上需要这个方法来传递需要在动画之后显示的视图控制器。如果我们需要在屏幕上显示多个视图（视图控制器），我们可以将这些视图传递到数组中。但这种情况很少见，因此所有教程都显示在数组中传递单个 VC。
UIPageViewControllerDatasource用于提供额外的视图控制器。
您可以用这种方式实现您的 viewcontroller 页面viewcontroller。
// Extension on UIViewController to insert child view controller
extension UIViewController {
func insertChildController(_ childController: UIViewController, intoParentView parentView: UIView) {
childController.willMove(toParentViewController: self)
self.addChildViewController(childController)
childController.view.frame = parentView.bounds
parentView.addSubview(childController.view)
childController.didMove(toParentViewController: self)
}
}
// Subclass of UICollectionViewController to create IndexedCollectionViewController. This is done to introduce an integer property to index collectionview controllers
class IndexedCollectionViewController:UICollectionViewController {
var index:Int = 0
}
class HomeViewController: UIViewController {
var pageViewController:UIPageViewController!
override func viewDidLoad() {
super.viewDidLoad()
addPageViewController()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
// MARK:- PageView
extension HomeViewController:UIPageViewControllerDataSource, UIPageViewControllerDelegate {
fileprivate func addPageViewController() {
if !self.isViewLoaded {
return
}
self.pageViewController = UIPageViewController(transitionStyle: UIPageViewControllerTransitionStyle.scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.horizontal, options: nil)
let firstVC = self.viewController(atIndex: 0)
pageViewController.setViewControllers([firstVC], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
pageViewController.dataSource = self
pageViewController.delegate = self
self.insertChildController(pageViewController, intoParentView: self.view)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
var index = (viewController as! IndexedCollectionViewController).index
index = index+1
return self.viewController(atIndex: index)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
var index = (viewController as! IndexedCollectionViewController).index
if(index == 0){return nil}
index = index-1
return self.viewController(atIndex: index)
}
// Method that creates viewcontroller
private func viewController(atIndex index:Int) -> IndexedCollectionViewController {
// This method will work only if you change the Class of CollectionViewController to IndexedCollectionViewController in your storyboard
let vc = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! IndexedCollectionViewController
vc.itemStrings = matrixArray[index].makeString()
vc.index = index
vc.columns = problem.columns
vc.rows = problem.rows
return vc
}
}
在我看来，您的视图布局应如下所示。
VC1 :-> 具有开始按钮的视图控制器，并将显示 vc2。
VC2 :-> 显示页面浏览量的视图控制器。
它可以是一个 PageViewController 本身（因为 UIPageViewController 是 UIViewController 的子类）或者一个简单的 ViewController 添加了 PageViewController 作为 child VC.
页面ViewController，本质上是以页面的形式显示其他ViewController的内容。在您的案例中，这些其他 viecontroller 是 CollectionViewController。
我已经设置了一个 CollectionViewController，它将从数据源创建一个 CollectionView。现在我想使用 PageViewController 在 CollectionView 中滑动，但我不知道如何创建包含 CollectionView 的数组。
到目前为止，我仅通过以下方式展示了其中一个 CollectionView：
let CollectionVC = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! CollectionViewController
CollectionVC.itemStrings = matrixArray[0].makeString()
CollectionVC.columns = problem.columns
CollectionVC.rows = problem.rows
self.present(CollectionVC, animated: true, completion: nil)
呈现一个视图效果很好。
但是现在我需要创建一个可以被 PageViewController 读取的数组来生成 PageView，我该怎么做？我什至不确定 PageViewController 数据源所需的格式，据我从其他教程中可以看出，它应该是 UIViewController 的数组而不是 UICollection[ 类型的数组=62=] 正如我计划的那样，如果是这样的话，我怎样才能使它与 CollectionViews 一起工作？
关于如何创建可用作页面数据源的数组的任何建议ViewController？
更多说明
这是一张它应该如何看的图片：
每个屏幕基本上都是由集合ViewController创建的，页面ViewController组织它们，并可以按照分页指示在这些屏幕中滑动。
//编辑：
感谢 Puneet Sharma 的回答。我确信这已经非常接近我正在寻找的解决方案。但是由于我在编程方面完全是一个自学成才的菜鸟，所以我不太确定将所有这些信息放在哪里。
到目前为止我有 2 个控制器，一个 ViewController:
class ViewController: UIViewController {
//Initialize Variables:
var matrixArray = Array<Matrix>()
var basicArray = Array<Array<Int>>()
var maxArray = Array<Double>()
var currentSolutionArray = Array<Array<Double>>()
var isOptimal = false
var isCyceling = false
var CollectionViewArray: [UICollectionView] = []
//The outlets are for later
@IBOutlet weak var myObjectionFunction: UITextField!
@IBOutlet weak var myConstraint1: UITextField!
@IBOutlet weak var myConstraint1RightSide: UITextField!
@IBOutlet weak var myConstraint2: UITextField!
@IBOutlet weak var myConstraint2RightSide: UITextField!
@IBOutlet weak var myConstraint3: UITextField!
@IBOutlet weak var myConstraint3RightSide: UITextField!
//StartButton
@IBAction func startButton(_ sender: Any) {
//Initializing Objection Function
let objFunction = [-40.0,-30.0,0.0,0.0,0.0,0.0]
// Initializing Nr. of Rows and Columns of the Matrix
let rows = 4
let columns = 6
// Initializing constraints
let constraint0 = [1.0,1.0,1.0,0.0,0.0,8.0]
let constraint1 = [2.0,1.0,0.0,1.0,0.0,12.0]
let constraint2 = [2.0,3.0,0.0,0.0,1.0,18.0]
//Initalize an Array containing all constraints
let constraints = [constraint0, constraint1, constraint2]
//Alternative for use of UserData -> Delete objFuntion, rows, columns, constraint0..2, constraintsArray
//let problem = getData().0
//let constraints = getData.1
let problem = LinearProblem.createLP(rows: rows, columns: columns, objFunction: objFunction, constraints: constraints)
// Initializing Current solution (No need to change anything)
let currentSolution = Array(repeating: 0.0, count: constraints.count)
print("Initial Problem: ")
print(problem)
print("\n")
let solution = PrimalSimplex(problem: problem, currentSolution: currentSolution)
matrixArray = solution.0
basicArray = solution.1
maxArray = solution.2
currentSolutionArray = solution.3
isOptimal = solution.4
isCyceling = solution.5
let CollectionVC = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! CollectionViewController
CollectionVC.itemStrings = matrixArray[0].makeString()
CollectionVC.columns = problem.columns
CollectionVC.rows = problem.rows
self.present(CollectionVC, animated: true, completion: nil)
}
}
它基本上是一个带有开始按钮的屏幕，当它被按下时会启动算法并显示下一个视图。
然后是这个合集ViewController:
class CollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var myCollectionView: UICollectionView!
//Is also set in Storyboard
let reuseIdentifier = "cell"
var itemStrings: Array<String?> = []
var rows: Int = 0
var columns: Int = 0
//
//Setup CollectionView: Table to display LPs including Datasource
//
// MARK: - UICollectionViewDelegate protocol
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
// handle tap events
let newPath = indexPath.item + 1
print("You selected cell #\(newPath)")
}
// calculate height and width of cell
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.bounds.width
let gaps = columns-1
let tmpWidth = width - CGFloat(gaps)
let itemWidth = tmpWidth / CGFloat(columns)
let height = collectionView.bounds.height
let tmpHeight = height - CGFloat(gaps)
let itemHeight = tmpHeight / CGFloat(rows)
return CGSize(width: itemWidth, height: itemHeight)
}
// CellSpacing vertical
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(3)
}
// CellSpacing horizontal
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return CGFloat(1)
}
// change background color when user touches cell
func collectionView(_ collectionView: UICollectionView, didHighlightItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
//Change color
if cell?.backgroundColor == UIColor(red:0.96, green:0.40, blue:0.40, alpha:1.0) {
cell?.backgroundColor = UIColor(red:0.94, green:0.94, blue:0.94, alpha:1.0)
}
else{
cell?.backgroundColor = UIColor(red:0.96, green:0.40, blue:0.40, alpha:1.0)
}
}
// MARK: - UICollectionViewDataSource protocol
// tell the collection view how many cells to make
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
let numberOfItems = rows*columns
return numberOfItems
}
// make a cell for each cell index path
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// get a reference to our storyboard cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
// Use the outlet in our custom class to get a reference to the UILabel in the cel
cell.myLabel.text = itemStrings[indexPath.item]
cell.backgroundColor = UIColor(red:0.94, green:0.94, blue:0.94, alpha:1.0)
// Change shape of cells
cell.layer.cornerRadius = 8
return cell
}
}
这些也是目前我故事板中仅有的元素。
我想我需要在 Storyboard 中添加 PageViewController 并用你的 HomeViewController 代码填充它。然后将 Storyboard 中的 segue 从开始按钮更改为 HomeViewController.
我不明白的部分是将要创建的ChildVC。我需要将该部分添加到我的 ViewController 吗？那么 IndexedCollectionViewController class 呢？我是否需要为此创建一个额外的文件，或者我是否可以将其放入我的 collectionView 某处？
那么这个函数呢
private func viewController(atIndex index:Int) -> IndexedCollectionViewController
那去哪儿了？我认为在我的情况下会在 ViewController class 中，我只是调用开始按钮中的方法 ?
很抱歉提出所有这些非常简单的问题，但作为一个自学成才的编码员，有时很难掌握事物背后的概念 ^^
在我看来，UIPageViewController 文档有点含糊。 争论的焦点是一种方法的存在：
func setViewControllers(_ viewControllers: [UIViewController]?,
direction: UIPageViewControllerNavigationDirection,
animated: Bool,
completion: ((Bool) -> Void)? = nil)
所有教程都在这个数组中传递一个视图控制器，它们是正确的of-course。但是因为这个方法的存在，我假设我可以把所有需要显示的视图控制器放在一个数组中到 pageviewcontroller.
但是，实际上需要这个方法来传递需要在动画之后显示的视图控制器。如果我们需要在屏幕上显示多个视图（视图控制器），我们可以将这些视图传递到数组中。但这种情况很少见，因此所有教程都显示在数组中传递单个 VC。
UIPageViewControllerDatasource用于提供额外的视图控制器。
您可以用这种方式实现您的 viewcontroller 页面viewcontroller。
// Extension on UIViewController to insert child view controller
extension UIViewController {
func insertChildController(_ childController: UIViewController, intoParentView parentView: UIView) {
childController.willMove(toParentViewController: self)
self.addChildViewController(childController)
childController.view.frame = parentView.bounds
parentView.addSubview(childController.view)
childController.didMove(toParentViewController: self)
}
}
// Subclass of UICollectionViewController to create IndexedCollectionViewController. This is done to introduce an integer property to index collectionview controllers
class IndexedCollectionViewController:UICollectionViewController {
var index:Int = 0
}
class HomeViewController: UIViewController {
var pageViewController:UIPageViewController!
override func viewDidLoad() {
super.viewDidLoad()
addPageViewController()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
// MARK:- PageView
extension HomeViewController:UIPageViewControllerDataSource, UIPageViewControllerDelegate {
fileprivate func addPageViewController() {
if !self.isViewLoaded {
return
}
self.pageViewController = UIPageViewController(transitionStyle: UIPageViewControllerTransitionStyle.scroll, navigationOrientation: UIPageViewControllerNavigationOrientation.horizontal, options: nil)
let firstVC = self.viewController(atIndex: 0)
pageViewController.setViewControllers([firstVC], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
pageViewController.dataSource = self
pageViewController.delegate = self
self.insertChildController(pageViewController, intoParentView: self.view)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
var index = (viewController as! IndexedCollectionViewController).index
index = index+1
return self.viewController(atIndex: index)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
var index = (viewController as! IndexedCollectionViewController).index
if(index == 0){return nil}
index = index-1
return self.viewController(atIndex: index)
}
// Method that creates viewcontroller
private func viewController(atIndex index:Int) -> IndexedCollectionViewController {
// This method will work only if you change the Class of CollectionViewController to IndexedCollectionViewController in your storyboard
let vc = storyboard?.instantiateViewController(withIdentifier: "CollectionView") as! IndexedCollectionViewController
vc.itemStrings = matrixArray[index].makeString()
vc.index = index
vc.columns = problem.columns
vc.rows = problem.rows
return vc
}
}
在我看来，您的视图布局应如下所示。
VC1 :-> 具有开始按钮的视图控制器，并将显示 vc2。
VC2 :-> 显示页面浏览量的视图控制器。
它可以是一个 PageViewController 本身（因为 UIPageViewController 是 UIViewController 的子类）或者一个简单的 ViewController 添加了 PageViewController 作为 child VC.
页面ViewController，本质上是以页面的形式显示其他ViewController的内容。在您的案例中，这些其他 viecontroller 是 CollectionViewController。