按下按钮时滚动到特定 slide/website

Question

我有加载不同网站的设置幻灯片。基本上你可以左右滑动来查看不同的网站，但我不知道如何在单击按钮时转到某些 slide/website。

这里是加载网站的地方，scrollview 是设置的：

func loadWebsites() -> [Website] {
    let url1 = URL(string: "https://www.nike.com")
    let request1 = URLRequest(url: url1!)
    let url2 = URL(string: "https://www.finishline.com")
    let request2 = URLRequest(url: url2!)
    let url3 = URL(string: "https://www.eastbay.com")
    let request3 = URLRequest(url: url3!)
    let url4 = URL(string: "https://www.flightclub.com")
    let request4 = URLRequest(url: url4!)
    let url5 = URL(string: "https://www.footaction.com")
    let request5 = URLRequest(url: url5!)

    let website1:Website = Bundle.main.loadNibNamed("Website", owner: self, options: nil)?.first as! Website
    website1.webView.load(request1)
    website1.webView.navigationDelegate = self

    let website2:Website = Bundle.main.loadNibNamed("Website", owner: self, options: nil)?.first as! Website
    website2.webView.load(request2)
    website2.webView.navigationDelegate = self

    let website3:Website = Bundle.main.loadNibNamed("Website", owner: self, options: nil)?.first as! Website
    website3.webView.load(request3)
    website3.webView.navigationDelegate = self

    let website4:Website = Bundle.main.loadNibNamed("Website", owner: self, options: nil)?.first as! Website
    website4.webView.load(request4)
    website4.webView.navigationDelegate = self

    let website5:Website = Bundle.main.loadNibNamed("Website", owner: self, options: nil)?.first as! Website
    website5.webView.load(request5)
    website5.webView.navigationDelegate = self

    return [website1, website2, website3, website4, website5]
}

func setupWebsiteScrollView(websites : [Website]) {
    scrollView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
    scrollView.contentSize = CGSize(width: view.frame.width * CGFloat(websites.count), height: view.frame.height)
    scrollView.isPagingEnabled = true
    scrollView.contentInsetAdjustmentBehavior = .never

    for i in 0 ..< websites.count {
        websites[i].frame = CGRect(x: view.frame.width * CGFloat(i), y: 0, width: view.frame.width, height: view.frame.height)
        scrollView.addSubview(websites[i])
    }
}

不太明白具体到某个 slide/website 的代码。 "buttononeAction" 函数应将用户带到第一张幻灯片。

@objc func buttononeAction(_ sender: UIButton!) {
   //Code here
}

Answer 1

您需要跟踪正在加载特定网站的页面。那么你可以使用这个方法：

func scrollToPage(page: Int, animated: Bool) {
    var frame: CGRect = self.scrollView.frame
    frame.origin.x = frame.size.width * CGFloat(page)
    frame.origin.y = 0
    self.scrollView.scrollRectToVisible(frame, animated: animated)
}


@objc func buttononeAction(_ sender: UIButton!) {
   //Code here
   //Make sure you add some sort of validation to check if page exist. Otherwise, application will crash.
   self.scrollToPage(page: 1, animated: true)
}

Answer 2

首先，我建议您为此使用 UIPageViewController，但是使用 scrollview，您需要更改 scrollView 的 contentOffset：

let indexYouWantToScrollTo = 0
scrollView.setContentOffset(CGPoint(x: CGFloat(indexYouWantToScrollTo) * view.frame.width, y: 0), animated: true)

按下按钮时滚动到特定 slide/website

Scroll to specific slide/website when button is pressed

uiscrollview

ios

swift