Swift UIWebView约束全屏

Question

我的UIWebView有这些限制：

 let horizontalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0)
        view.addConstraint(horizontalConstraint)

        let verticalConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0)
        view.addConstraint(verticalConstraint)

        let widthConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100)
        view.addConstraint(widthConstraint)

        let heightConstraint = NSLayoutConstraint(item: webview, attribute: NSLayoutAttribute.Height, relatedBy: NSLayoutRelation.Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: 100)
        view.addConstraint(heightConstraint)

我的问题是，如何获得整个设备屏幕的宽度和高度限制？我必须以编程方式执行此操作

Answer 1

将此约束用于全屏模式：

let topConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.top, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.top, multiplier: 1, constant: 0)
let botConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.bottom, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.bottom, multiplier: 1, constant: 0)
let leftConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.leading, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.leading, multiplier: 1, constant: 0)
let rigthConst = NSLayoutConstraint(item: self.webView, attribute: NSLayoutAttribute.trailing, relatedBy: NSLayoutRelation.equal, toItem: self.view, attribute: NSLayoutAttribute.trailing, multiplier: 1, constant: 0)

NSLayoutConstraint.activate([topConst,botConst,leftConst,rigthConst])

self.webView.translatesAutoresizingMaskIntoConstraints = false

webview是我希望全屏显示的视图。激活约束后，不要忘记将translatesAutoresizingMaskIntoConstraints设置为false。