Ios 是否有一种特殊的方式来布局WKWebView？

我对WKWebView有一个问题，我是这样开始的

    let configuration = WKWebViewConfiguration()
        configuration.applicationNameForUserAgent = "Browser"
        configuration.ignoresViewportScaleLimits = true
        configuration.allowsInlineMediaPlayback = true
        configuration.allowsAirPlayForMediaPlayback = true
        configuration.allowsPictureInPictureMediaPlayback = true
        configuration.mediaTypesRequiringUserActionForPlayback = WKAudiovisualMediaTypes.audio
        configuration.selectionGranularity = WKSelectionGranularity.character
        configuration.dataDetectorTypes = WKDataDetectorTypes.link
    let webview = WKWebView(frame: .zero, configuration: configuration)
        webview.allowsBackForwardNavigationGestures = true
        webview.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        webview.uiDelegate = self
        webview.navigationDelegate = self
    let url = URL(string: "https://www.google.com")!
    let request = URLRequest(url: url)
        webview.load(request)
        self.view = webview

每次我在网站上输入搜索框，例如“Google”，我都会在调试器中获得此日志。。。我似乎不明白为什么它抛出约束问题，而我没有设置任何。。。此视图包含在具有

UIToolbar

故事板截图

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@Miteshjadav WKWebview在故事板中支持iOS 11.0的部署目标。否则，无法在情节提要中设置WKWebview。您必须以编程方式设置框架或约束。@Miteshjadav这并不是关键。