- UIPageViewController的使用。练习中 PageViewController 的子视图是动态的，重复调用 WebViewController 每一页只是改变了 WKWebView 加载的url。在 PageViewController 中需要实现UIPageViewControllerDataSource的两个方法，返回当前页VC的前一个和后一个VC：
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
var index = (viewController as! WebViewController).index
index -= 1
return setViewController(index: index)
}
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
var index = (viewController as! WebViewController).index
index += 1
return setViewController(index: index)
}
在 setViewController 方法中为 WebViewController 设置相应的url和索引并返回
func setViewController(index: Int) -> WebViewController? {
if case 0..<urls.count = index {
let main = UIStoryboard.init(name: "Main", bundle: Bundle.main)
if let webVC = main.instantiateViewController(withIdentifier: "webView") as? WebViewController {
webVC.url = urls[index]
webVC.index = index
return webVC
}
}
return nil
}
- 练习中使用的url均选自简书-7日热门。简书网址使用HTTP协议所以需要在 Info.plist 文件中设置 App Transport Security Settings - Allow Arbitrary Loads 为 YES