WKWebView 缩放以适合

从 UIWebView 转移到 WKWebView，我无法弄清楚如何使用 WKWebView 大小上的 loadHTMLString 函数加载我正在加载的 HTML 以适应视图边界。我现在可以加载 html，但它超出了我视图的右侧和底部。如何缩放它以适合我的视图范围？

首先，查看容器视图故事板在其中您将添加 WKWebView 作为subview:

@IBOutlet var container: UIView!

然后导入WebKit并初始化它，然后添加为容器的子视图。为了保留边界，您必须根据其父视图为其赋予约束值。我就是这样做的：

        let webView = WKWebView(frame: .zero)
        container.addSubview(webView)

        webView.translatesAutoresizingMaskIntoConstraints = false
        let height = NSLayoutConstraint(item: webView, attribute: .height, relatedBy: .equal, toItem: container, attribute: .height, multiplier: 1, constant: 0)
        let width = NSLayoutConstraint(item: webView, attribute: .width, relatedBy: .equal, toItem: container, attribute: .width, multiplier: 1, constant: 0)
        let leftConstraint = NSLayoutConstraint(item: webView, attribute: .leftMargin, relatedBy: .equal, toItem: container, attribute: .leftMargin, multiplier: 1, constant: 0)
        let rightConstraint = NSLayoutConstraint(item: webView, attribute: .rightMargin, relatedBy: .equal, toItem: container, attribute: .rightMargin, multiplier: 1, constant: 0)
        let bottomContraint = NSLayoutConstraint(item: webView, attribute: .bottomMargin, relatedBy: .equal, toItem: container, attribute: .bottomMargin, multiplier: 1, constant: 0)
        container.addConstraints([height, width, leftConstraint, rightConstraint, bottomContraint])

        let myURL = URL(string: "")
        let myRequest = URLRequest(url: myURL!)
        webView.load(myRequest)

添加所需的网址即可完成。