Swift中WKWebview的详细用法：
class ViewController: UIViewController, WKNavigationDelegate, WKScriptMessageHandler, WKUIDelegate {
// wkWebView
lazy var webView: WKWebView = {
// 创建WKPreferences
let preferences = WKPreferences()
// 开启js
preferences.javaScriptEnabled = true
// 创建WKWebViewConfiguration
let configuration = WKWebViewConfiguration()
// 设置WKWebViewConfiguration的WKPreferences
configuration.preferences = preferences
// 创建WKUserContentController
let userContentController = WKUserContentController()
// 配置WKWebViewConfiguration的WKUserContentController
configuration.userContentController = userContentController
// 给WKWebView与Swift交互起一个名字：callbackHandler，WKWebView给Swift发消息的时候会用到
// 此句要求实现WKScriptMessageHandler协议
configuration.userContentController.add(self, name: "callbackHandler")
// 创建WKWebView
var webView = WKWebView(frame:CGRect.zero, configuration: configuration)
// 让webview翻动有回弹效果
webView.scrollView.bounces = true
// 只允许webview上下滚动
webView.scrollView.alwaysBounceVertical = true
// 此句要求实现WKNavigationDelegate协议
webView.navigationDelegate = self webView.evaluateJavaScript("document.documentElement.style.webkitTouchCallout='none';document.documentElement.style.webkitUserSelect='none';", completionHandler: nil)
return webView
}()
// 进度条
lazy var progressView: UIProgressView = {
var progressView = UIProgressView()
progressView.progressTintColor = UIColor.red
progressView.trackTintColor = UIColor.clear
return progressView
}()
override func viewWillDisappear(_ animated: Bool) {
self.webView.removeObserver(self, forKeyPath: "estimatedProgress")
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.view.backgroundColor = UIColor.white
initInterface()
}
func initInterface() -> () {
self.view.addSubview(self.webView);
self.webView.snp.makeConstraints { (make) in
make.edges.equalTo(self.view).inset(UIEdgeInsets.init(top: 0, left: 0, bottom: 0, right: 0));
}
self.webView.sizeToFit();
//创建网址
let url = NSURL(string: "http://www.baidu.com")
//创建请求
let request = NSURLRequest(url: url! as URL)
//加载请求
self.webView.load(request as URLRequest)
self.view .addSubview(progressView);
self.progressView.snp.makeConstraints { (make) in
make.top.equalTo(self.view).offset(0)
make.left.equalTo(self.view).offset(0)
make.right.equalTo(self.view).offset(0)
make.height.equalTo(5.0);
}
//进度条的进度监听
self.webView.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)
}
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if keyPath == "estimatedProgress" {
self.progressView.alpha = 1.0
self.progressView.setProgress(Float(webView.estimatedProgress), animated: true)
//进度条的值最大为1.0
if(self.webView.estimatedProgress >= 1.0) {
UIView.animate(withDuration: 0.3, delay: 0.1, options: .curveEaseInOut, animations: { () -> Void in
self.progressView.alpha = 0.0
}, completion: { (finished:Bool) -> Void in
self.progressView.progress = 0
})
}
}
}
func userContentController(_ userContentController: WKUserContentController, didReceive message: WKScriptMessage) { }
// 加载完毕以后执行，自适应屏幕宽度，有的屏幕不自适应，需要自适应屏幕宽度
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
webView.evaluateJavaScript("""
var oMeta = document.createElement('meta');
oMeta.content = 'width=device-width, initial-scale=1, user-scalable=0';
oMeta.name = 'viewport';
document.getElementsByTagName('head')[0].appendChild(oMeta);
""",completionHandler: nil)
}
// 处理网页加载失败
private func webView(webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: NSError){
self.progressView.progress = 0
}
//处理网页加载完成
func webView(webView: WKWebView, didFinishNavigation navigation: WKNavigation!){ }
func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error){
self.progressView.progress = 0
}
}
在xcode14.3以下编译工具上加载wkwebview，都会报错，不管是新建的swift项目还是oc项目，
报错信息：This method should not be called on the main thread as it may lead to UI unresponsiveness.
反复查了很多博客，这是xcode的版本和运行的系统版本16.0有冲突导致，你可以选择低于16.0的版本的系统，或者升级xcode到14.3版本以上就可以解决这个问题！
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