在UIPageViewController中更改页面自动使用swift 3中的计时器? [英] change pages in UIPageViewController Automatically with timer in swift 3?
问题描述
我有 UIPageViewController
包含4个视图控制器
I have UIPageViewController
that Contains 4 view Controllers
我设置了自动更改视图控制器的计时器(进行中)到下一个视图控制器) - 这个计时器和方法将工作但问题是,它的工作原理只是第一个幻灯片,当应用程序将运行,并在5秒后, UIPageViewController
将显示第二张幻灯片但之后什么都不会发生!
这是我使用的代码
I set the timer for changing view controllers automatically(going to the next view controllers) - This timer and method will work But the problem is that It works Just for first Slide and when the app will run and after 5 seconds the UIPageViewController
will show the second slide But after that nothing will happen !
This Is the Code That I used
lazy var VCArr : [UIViewController] = {
return [self.VCInstance(name : "VC1"),
self.VCInstance(name : "VC2"),
self.VCInstance(name :"VC3"),
self.VCInstance(name :"VC4")]
}()
func changeSlide() {
print("Slide Change!")
guard let currentViewController = self.VCArr.first else { return }
guard let nextViewController = dataSource?.pageViewController( self, viewControllerAfter: currentViewController ) else { return }
setViewControllers([nextViewController], direction: .forward, animated: true, completion: nil)
}
var tTime: Timer!
override func viewDidLoad() {
super.viewDidLoad()
tTime = Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(changeSlide), userInfo: nil, repeats: true)
}
我认为问题出在这一行
guard let currentViewController = self.VCArr.first else { return }
但我不知道如何更改此行以正常工作
But I don't know how to change this line to work fine
推荐答案
试试这个:
您可以按VCArr的索引更改视图控制器。
You can change view controller by index of VCArr.
var index = 0
func changeSlide() {
index + 1
if index < self.VCArr.count {
setViewControllers([VCArr[index]], direction: .forward, animated: true, completion: nil)
}
else {
index = 0
setViewControllers([VCArr[0]], direction: .forward, animated: true, completion: nil)
}
}
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