快速-将约束添加到UIWebView滚动视图，以便周围距屏幕边缘的距离为0

let webView = UIWebView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))
view.addSubview(webView)

webView.translatesAutoresizingMaskIntoConstraints = false

// 添加顶部约束
let topConstraint = NSLayoutConstraint(item: webView, attribute: .top, relatedBy: .equal, toItem: view, attribute: .top, multiplier: 1.0, constant: 0)
view.addConstraint(topConstraint)

// 添加底部约束
let bottomConstraint = NSLayoutConstraint(item: webView, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1.0, constant: 0)
view.addConstraint(bottomConstraint)

// 添加左侧约束
let leadingConstraint = NSLayoutConstraint(item: webView, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1.0, constant: 0)
view.addConstraint(leadingConstraint)

// 添加右侧约束
let trailingConstraint = NSLayoutConstraint(item: webView, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1.0, constant: 0)
view.addConstraint(trailingConstraint)

if let url = URL(string: "https://www.example.com") {
    let request = URLRequest(url: url)
    webView.loadRequest(request)
}