[英]page view controller hide indicator dots and stop in the last page (can't come back)
I have a page control in my project and I want to do two things : 1. I want to hide indicator dots in the last page 2. I want to lock the last page in the (page VC(my class)) that I can't come back to the first page here is my code 我的项目中有一个页面控件,我想做两件事:1.我想在最后一页中隐藏指示器点2.我想锁定我可以在(page VC(my class))中的最后一页回到第一页这是我的代码
class pageVC : UIPageViewController , UIPageViewControllerDataSource , UIPageViewControllerDelegate {
lazy var VCArr : [UIViewController] = {
return [self.VCInstance(name : "FirtsVC"),
self.VCInstance(name : "SecondVC"),
self.VCInstance(name :"ThirdVC"),
self.VCInstance(name :"FourthVC"),
self.VCInstance(name :"FivethVC")]
}()
private func VCInstance(name : String) -> UIViewController {
return UIStoryboard(name : "Main" , bundle : nil).instantiateViewController(withIdentifier: name)
}
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.delegate = self
if VCArr.last != nil {
print("first Page Reached!")
}
if let firstVC = VCArr.first {
setViewControllers([firstVC] , direction: .forward , animated: true, completion: nil)
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let pageVC = UIPageControl()
for view in self.view.subviews {
if view is UIScrollView {
view.frame = UIScreen.main.bounds
}else if view is UIPageControl{
view.backgroundColor = UIColor.clear
pageVC.numberOfPages = 5
pageVC.center = self.view.center
pageVC.layer.position.y = self.view.frame.height - 180 ;
}
}
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController?{
guard let viewControllerIndex = VCArr.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex-1
guard previousIndex >= 0 else {
return VCArr.last
}
guard VCArr.count > previousIndex else {
return nil
}
return VCArr[previousIndex]
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController?{
guard let viewControllerIndex = VCArr.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex+1
guard nextIndex < VCArr.count
else {
return VCArr.first
}
guard VCArr.count > nextIndex else {
return nil
}
return VCArr[nextIndex]
}
public func presentationCount(for pageViewController: UIPageViewController) -> Int{
return VCArr.count
}
public func presentationIndex(for pageViewController: UIPageViewController) -> Int{
guard let firstViewController = viewControllers?.first , let firstViewControllerIndex = VCArr.index(of: firstViewController) else {
return 0
}
return firstViewControllerIndex
}
public func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
if (VCArr.last!.isViewLoaded)
{
print("It is Done!!!")
}
}
Change this, which is making the page view to return to the first one when it is in the last one: 更改此项,使页面视图在最后一个时返回到第一个:
let nextIndex = viewControllerIndex+1
guard nextIndex < VCArr.count
else {
return nil //was VCArr.first
}
And to make it hidden, first move the let pageVC = UIPageControl()
below the class pageVC : UIPageViewController , UIPageViewControllerDataSource , UIPageViewControllerDelegate {
to make it public within the class. 要使其隐藏,请首先将
let pageVC = UIPageControl()
移动到class pageVC : UIPageViewController , UIPageViewControllerDataSource , UIPageViewControllerDelegate {
下面class pageVC : UIPageViewController , UIPageViewControllerDataSource , UIPageViewControllerDelegate {
使其在类中公开。 Then add: 然后加:
if nextIndex == VCArr.count{
pageVC.isHidden = true
}
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