import UIKitimport WebKitimport SnapKitclass CMWebVC:UIViewController, WKNavigationDelegate {
var webUrl: String? var webView: WKWebView =WKWebView() var progressView:UIProgressView = UIProgressView() var closeBtn: UIButton! override func initVC() {
webView.addObserver(self, forKeyPath:"estimatedProgress", options: NSKeyValueObservingOptions.new, context:nil) webView.navigationDelegate =self }
deinit {
webView.removeObserver(self, forKeyPath:"estimatedProgress") webView.navigationDelegate =nil }
override func viewDidLoad() {
super.viewDidLoad() // webview view.addSubview(webView) webView.snp.makeConstraints {
(make)in make.width.height.equalToSuperview() }
// progressview view.addSubview(progressView) progressView.snp.makeConstraints {
(make)in make.width.equalToSuperview() make.height.equalTo(3) make.top.equalToSuperview() }
progressView.tintColor =UIColor.ColorBgTheme() progressView.isHidden =true // load url if webUrl !=nil {
webView.load(URLRequest(url:URL(string: webUrl!)!)) }
// shear self.showRightItem(image:"nav_share") {
}
}
override func viewWillAppear(_ animated:Bool) {
super.viewWillAppear(animated) self.closeButton() }
override func viewWillDisappear(_ animated:Bool) {
self.closeBtn.removeFromSuperview() }
func closeButton() {
if self.closeBtn ==nil {
self.closeBtn =UIButton(frame: CGRect(x:44, y: 0, width:44, height: 44)) self.closeBtn.setTitle("关闭", for: .normal) self.closeBtn.setTitleColor(UIColor.black, for: .normal) self.closeBtn.addAction({
(button)in self.navigationController!.popViewController(animated:true) }
) self.navigationController?.navigationBar.addSubview(self.closeBtn) }
}
override func observeValue(forKeyPath keyPath:String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
// 加载进度 if keyPath == "estimatedProgress" {
let newprogress = change?[.newKey]!as! Float let oldprogress = change?[.oldKey]as? Float ??0.0 //不要让进度条倒着走...有时候goback会出现这种情况 if newprogress < oldprogress {
return }
if newprogress == 1 {
progressView.isHidden =true progressView.setProgress(0, animated:false) }
else {
progressView.isHidden =false progressView.setProgress(newprogress, animated:true) }
}
}
func webView(_ webView:WKWebView, didFinish navigation: WKNavigation!) {
progressView.isHidden =true progressView.setProgress(0, animated:false) }
func webView(_ webView:WKWebView, didFail navigation: WKNavigation!, withError error: Error) {
progressView.isHidden =true progressView.setProgress(0, animated:false) }
override func navigateBack() {
if webView.canGoBack {
webView.goBack() }
else {
super.navigateBack() }
}
}