在仅在最后一个 UIImageview 上可见的 PageViewController 上添加 UIButton

Question

我完成了一个基于送餐的项目 app.I 添加了我的 3 张图像，它们位于视图控制器及其页面视图控制器中，因为我希望我的图像水平滑动。

我问这个问题的主要目的是我需要在最后一张图片中有一个按钮 view.Please 为我提供添加仅在最后一张图片中可见的 UIButton 的完整代码。例如 - :

(Lets Go) 是一个按钮，在关于按钮放置的最后一张图片 view.Forget 中可用。

提前致谢....

我的代码是这样的-:

ViewController.swift

导入 UIKit

class ViewController: UIViewController , UIPageViewControllerDataSource{

var pageViewController : UIPageViewController?
let Contentimages = ["splash","up","viewpage_bg"]


override func viewDidLoad() {
    
   super.viewDidLoad()
    
   createpageViewController()
   setupPageControl()
    
}

override func didReceiveMemoryWarning() {
    
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


func createpageViewController(){

let pageController = self.storyboard?.instantiateViewController(withIdentifier: "pageController") as! UIPageViewController
    pageController.dataSource = self
    if Contentimages.count > 0 {
    
        let  firstController = getItemController(0)!
        let startingViewController = [firstController]
    
    
         pageController.setViewControllers(startingViewController, direction: UIPageViewControllerNavigationDirection.forward, animated: false, completion: nil)
    }
        

    pageViewController = pageController
    addChildViewController(pageViewController!)
    self.view.addSubview(pageViewController!.view)
    pageViewController?.didMove(toParentViewController: self)

}

func setupPageControl(){

    let appearance = UIPageControl.appearance()
    appearance.pageIndicatorTintColor=UIColor.gray
    appearance.currentPageIndicatorTintColor=UIColor.white
    appearance.backgroundColor=UIColor.darkGray


}

func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {

    let  itemController = viewController as! ItemViewController
    if itemController.itemIndex > 0
    {
        
        return getItemController(itemController.itemIndex-1)
        
    }

    return nil

}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
    let  itemController = viewController as! ItemViewController
    if itemController.itemIndex+1 < Contentimages.count
    {
        
        return getItemController(itemController.itemIndex+1)
        
    }
    
    return nil

}

func presentationCount(for pageViewController: UIPageViewController) -> Int {
    return Contentimages.count
}
func presentationIndex(for pageViewController: UIPageViewController) -> Int {
    return 0
}
func  currentControllerIndex() -> Int {
    let  pageItemController = self.currentController()
    if let controller = pageItemController as?ItemViewController{
        
        return controller.itemIndex
        
    }
    
    return -1
}

func currentController() -> UIViewController? {
    
    if (self.pageViewController?.viewControllers?.count)! > 0{
        
        return self.pageViewController?.viewControllers![0]
        
    }
    return nil
}
func getItemController(_ itemIndex: Int) -> ItemViewController? {
    
    if itemIndex < Contentimages.count {
        
        let pageItemController = self.storyboard?.instantiateViewController(withIdentifier: "ItemController") as! ItemViewController
        
        pageItemController.itemIndex = itemIndex
        pageItemController.imageName = Contentimages[itemIndex]
        return pageItemController
    }
    return nil
}

}

项目ViewController.swift

导入 UIKit

class 项目ViewController：UIViewController {

var itemIndex: Int = 0;
var imageName: String = ""{
    
    
    didSet{
        
        if let imageView = contentImageView{
            
            
            imageView.image = UIImage(named : imageName)
        }
                    
    }
    
   
}




@IBOutlet var contentImageView: UIImageView!
override func viewDidLoad() {
    super.viewDidLoad()
    
    contentImageView.image = UIImage(named : imageName)
           // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

}

Answer 1

您可以在 ItemViewController 上添加此按钮。然后根据当前页面使按钮隐藏或可见。像这样：

let  pageItemController = self.currentController()
let currentPage = self.currentControllerIndex()

if currentPage == Contentimages.count - 1 {
    pageItemController.button.isHidden = false 
} else {
    pageItemController.button.isHidden = true 
}

例如这里（如果我正确理解你的代码）：

func pageViewController(_ pageViewController: UIPageViewController, 
                          viewControllerAfter viewController: UIViewController) -> UIViewController? {

    let  itemController = viewController as! ItemViewController
    if itemController.itemIndex == Contentimages.count - 1 {
        itemController.button.isHidden = false 
    } else {
        itemController.button.isHidden = true 
    }
    if itemController.itemIndex+1 < Contentimages.count {
        return getItemController(itemController.itemIndex+1)    
    }    
    return nil


}

Answer 2

尝试使用 UICollectionView 来实现：

1. UIViewController 包含 UICollectionView

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout
{
    override func viewDidLoad()
    {
        super.viewDidLoad()
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    {
        return 3
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CustomCollectionCell
        if indexPath.row == collectionView.numberOfItems(inSection: indexPath.section) - 1
        {
            cell.letsGoButton.isHidden = false
        }
        else
        {
            cell.letsGoButton.isHidden = true
        }
        return cell
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
    {
        return CGSize(width: collectionView.bounds.width, height: collectionView.bounds.height)
    }
}

2。自定义 UICollectionViewCell

class CustomCollectionCell : UICollectionViewCell
{
    @IBOutlet weak var letsGoButton: UIButton!
}

3。查看层次结构

4.需要记住的事情

不要忘记设置 UICollectionView 的 dataSource 和 delegate。
在 Storyboard 中将 Collection View Flow Layout 设置为 Horizontal。

在仅在最后一个 UIImageview 上可见的 PageViewController 上添加 UIButton

Adding UIButton on PageViewController which is visible on the last UIImageview only

ios

swift

uiimageview

uipageviewcontroller

ViewController.swift

项目ViewController.swift