ios - 滑动方向 PageViewController
<p><p>我的问题是使用 pageViewController 实现时的滑动 Action 。我希望它从右向左移动，但它是从左向右移动的，这对 UI 体验来说不是天生的!</p>
<p>当我使用 Xcode 7 和 Swift 2.2 时，它工作得很好......
因此，由于我复制/粘贴了我的代码并使用 Xcode 8 建议进行了修改，所以它出现了这种奇怪的行为。</p>
<pre><code>import UIKit
class FirstEventViewController: UIViewController {
// FIXME: - The swipe gesture has to be from right to left when the view appears (PageControl not showing)
var pageViewController: UIPageViewController!
var titleEvents = ()
var pageImages: NSArray!
override func viewDidLoad() {
super.viewDidLoad()
pageImages = NSArray(objects: "supersmashbros","spiritodjsession","thomasdelortrio")
titleEvents = ["supersmashbros","spiritodjsession","thomasdelortrio"]
initiatePgVC()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//TODO: CODE HERE
}
// MARK: - Private functions
/**
Function initializing the logic of the pageviewController
*/
func initiatePgVC() {
pageViewController = UIStoryboard(name:"Main", bundle:nil).instantiateViewController(withIdentifier: "PageViewController") as! UIPageViewController
pageViewController.dataSource = self
let startVC = viewControllerAtIndex(index: 0)
let viewControllers = NSArray(object: startVC) as!
pageViewController.setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
//pageViewController.view.frame = CGRect(x:0, y:65, width:self.view.frame.width, height:self.view.frame.size.height - 140)
pageViewController.view.frame = self.view.bounds
addChildViewController(pageViewController)
view.addSubview(pageViewController.view)
pageViewController.didMove(toParentViewController: self)
}
/**
Function associating the viewControllers
*/
func viewControllerAtIndex(index: Int)->SecondEventViewController{
if ((titleEvents.count == 0) || (index >= titleEvents.count)){
return SecondEventViewController()
}
let vc:SecondEventViewController = storyboard?.instantiateViewController(withIdentifier: "SecondEventViewController") as! SecondEventViewController
vc.imageFile = pageImages as! String
vc.labelTitle = titleEvents
vc.pageIndex = index
return vc
}
}
extension FirstEventViewController:UINavigationBarDelegate{
func position(for bar: UIBarPositioning) -> UIBarPosition {
return .topAttached
}
}
extension FirstEventViewController:UIPageViewControllerDataSource{
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let vc = viewController as! SecondEventViewController
var index = vc.pageIndex as Int
if (index == 0 || index == NSNotFound){
return nil
}
index = index-1
return viewControllerAtIndex(index: index)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let vc = viewController as! SecondEventViewController
var index = vc.pageIndex as Int
if (index == NSNotFound){
return nil
}
index = index+1
if (index == titleEvents.count){
return nil
}
return viewControllerAtIndex(index: index)
}
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return titleEvents.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return 0
}
}
</code></pre>
<p>我曾经怀疑 <code>pageViewController.setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)</code> 因为它实现了方向，但即使我用 reverse 改变，也没有任何反应。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您是否以错误的方式改变了索引？</p>
<p>对于 after controller，我希望索引会增加，但你正在减少它，反之亦然。 </p>
<p>尝试交换它们，所以之后应该是 + 1，之前应该是 -1</p>
<pre><code>index = index+1
</code></pre></p>
<p style="font-size: 20px;">关于ios - 滑动方向 PageViewController，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/40420727/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/40420727/
</a>
</p>
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