iOS中WKWebView的应用

WKWebView的优势

• 在性能、稳定性、功能方面有很大提升（最直观的体现就是加载网页是占用的内存，模拟器加载百度与开源中国网站时，WKWebView占用23M，而UIWebView占用85M）
• 更多的支持HTML5的特性
• 允许JavaScript的Nitro库加载并使用（UIWebView中限制）；
• 高达60fps的滚动刷新率以及内置手势；
• 将UIWebViewDelegate与UIWebView重构成了14类与3个协议（查看苹果官方文档）；

基本使用方法

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WKWebView有两个delegate,WKUIDelegate 和 WKNavigationDelegate。WKNavigationDelegate主要处理一些跳转、加载处理操作，WKUIDelegate主要处理JS脚本，确认框，警告框等。因此WKNavigationDelegate更加常用。

比较常用的方法

- (void)viewDidLoad {    [super viewDidLoad];    webView = [[WKWebView alloc]init];    [self.view addSubview:webView];    [webView mas_makeConstraints:^(MASConstraintMaker *make) {        make.left.equalTo(self.view);        make.right.equalTo(self.view);        make.top.equalTo(self.view);        make.bottom.equalTo(self.view);    }];    webView.UIDelegate = self;    webView.navigationDelegate = self;    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];}#pragma mark - WKNavigationDelegate// 页面开始加载时调用- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{}// 当内容开始返回时调用- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation{}// 页面加载完成之后调用- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{}// 页面加载失败时调用- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation{}// 接收到服务器跳转请求之后调用- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{}// 在收到响应后，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{    NSLog(@"%@",navigationResponse.response.URL.absoluteString);    //允许跳转    decisionHandler(WKNavigationResponsePolicyAllow);    //不允许跳转    //decisionHandler(WKNavigationResponsePolicyCancel);}// 在发送请求之前，决定是否跳转- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{     NSLog(@"%@",navigationAction.request.URL.absoluteString);    //允许跳转    decisionHandler(WKNavigationActionPolicyAllow);    //不允许跳转    //decisionHandler(WKNavigationActionPolicyCancel);}#pragma mark - WKUIDelegate// 创建一个新的WebView- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures{    return [[WKWebView alloc]init];}// 输入框- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler{    completionHandler(@"http");}// 确认框- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler{    completionHandler(YES);}// 警告框- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{    NSLog(@"%@",message);    completionHandler();}

本来打算自己写的，参考了一些别人的博客，觉得他们写的简直太好了，所以直接粘链接吧

简书WKWebView的使用