在计时器的帮助下，Swift 4 在页面视图控制器中自动滑动

Posted 2023-03-13

【中文标题】在计时器的帮助下，Swift 4 在页面视图控制器中自动滑动

【英文标题】：Swift 4 auto slide in page view controller with help of timer

【发布时间】：2018-10-06 07:12:35

【问题描述】：

我正在尝试使用swift 4 在page view controller 中创建auto sliding。在这里，我尝试了下面的代码，但我得到了结果，它首先重复图像的index。我需要知道，如何实现下一个索引的移动？

// Image array
var name = ["one.png","two.png","three.png","four.png"]

// Timer in viewdidload()
tTime = Timer.scheduledTimer(timeInterval: 4, target: self, selector: #selector(changeSlide), userInfo: nil, repeats: true)

// Timer function call (The problem is here...)
@objc func changeSlide()  
        let pageContentViewController = self.viewControllerAtIndex(index: 0)
        self.pageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)
 

【问题讨论】：

在 viewdidload() 中添加 timer.starttimer() 方法

【参考方案1】：

    // Image array
    var name = ["one.png","two.png","three.png","four.png"]
    var currentIndex = -1

    // Timer in viewdidload()
    tTime = Timer.scheduledTimer(timeInterval: 4, target: self, selector: #selector(changeSlide), userInfo: nil, repeats: true)


    // Timer function call
    @objc func changeSlide() 
   
    currentIndex = (currentIndex == name.count - 1) ? 0 : currentIndex + 1

    let pageContentViewController = self.viewControllerAtIndex(index: currentIndex)
    self.pageViewController.setViewControllers([pageContentViewController!], direction: UIPageViewControllerNavigationDirection.forward, animated: true, completion: nil)

【讨论】：

或者你可以这样做：currentIndex = (currentIndex == name.count - 1) ? 0 : currentIndex + 1 ;)