1、初始化方法
- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration2、简单介绍一下configuration,WKWebViewConfiguration里面有个userContentController。可通过它为webview注入javaScript代码。并且可以添加监听javaScript的回调。
(1)初始化configuration
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc]init];(2)获取javaScript代码,我把javaScript代码写在了一个文件中
NSString *jsStr = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"WKWebViewJS" ofType:@"js"] encoding:NSUTF8StringEncoding error:nil];
(3)初始化script对象
/*@abstract 初始script对象 @param source javaScript代码 @param injectionTime 注入javaScript代码的时机 @param forMainFrameOnly 是不是仅为MainFrame注入 */ WKUserScript *userScript = [[WKUserScript alloc]initWithSource:jsStr injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
(4)添加script对象
[configuration.userContentController addUserScript:userScript];(5)添加scriptMessage回调 window.webkit.messageHandlers..postMessage() 在JS中实现这个方法,系统会调用这个方法- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
[configuration.userContentController addScriptMessageHandler:self name:@"imageClick"]; [configuration.userContentController addScriptMessageHandler:self name:@"popToPreviousVC"];
3、WKWebView 执行javaScript代码
self.webview evaluateJavaScript:@"changeFontSize(12)" completionHandler:^(id _Nullable result, NSError * _Nullable error) { }];
4、WKWebView的一些简单属性的介绍
backForwardList 浏览历史 title 网页标题 支持KVO URL 正在显示的URL 支持KVO loading 是否正在加载 支持KVO estimatedProgress 加载进度 支持KVO canGoBack canGoForward 能否后退 前进 支持KVO reload 重新加载 stopLoading 停止加载 allowsBackForwardNavigationGestures 是否允许侧滑返回上一页
5、WKWebView的加载方法跟UIWebView基本一样
- (nullable WKNavigation *)loadRequest:(NSURLRequest *)request; - (nullable WKNavigation *)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL; - (nullable WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL;
#二 WKWebViewUIDelegate
//当需要打开一个新窗口的时候的调用,如a标签的target='_blank',需要返回一个新的Webview - (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures 以下三个类似alert的代理,一定要调用completionHandler(),这个回调,告诉webview结果 //webview上需要弹出alert的时候调用此方法,如果不实现此方法,则webview的alert是显示不出来,alert类似于只有确定按钮的UIAlertView - (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler //webview上需要弹出confirm的时候调用此方法,如果不实现此方法,则webview的confirm是显示不出来,confirm类似于有确定按钮和取消按钮的UIAlertView - (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler //webview上需要弹出prompt的时候调用此方法,如果不实现此方法,则webview的prompt是显示不出来,prompt类似于带一个textField的UIAlertView。defaultText相当于textField的placeholed - (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler //window.close() 的时候调用 - (void)webViewDidClose:(WKWebView *)webView
#三 WKWebViewNavigationDelegate
//决定是否允许发起这个请求 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler //在webview有响应之后,再次决定是否允许这个请求 - (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandle //webview开始加载的时候调用 - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation //webview内容已经加载结束,但是上面的某些资源比如图片加载之前调用 - (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation //webview加载结束的时候调用 - (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation //webview加载失败的时候调用 - (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error //webview在commit过程中失败的时候调用,例如在didCommitNavigation这个代理方法中调用webview的stopLoading方法 - (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
#四 WKScriptMessageHandler
//收到JavaScript回调的时候调用 - (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
#五 接下来用一下做个小demo。 功能如下: 1、点击按钮可以控制webView上的字体的大小和颜色 2、点击webView上的返回,能pop到上一个VC 3、点击webView图片,弹出alert告诉我弹出的是第几张图片,和图片的大小和位置以及所有的图片的地址 4、验证代理方法 效果如下:
(1)首先为webview注入JS代码,JS代码里主要实现的是:当window加载之后,为img标签添加click事件,定义改变字体颜色和大小的函数
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc]init]; NSString *jsStr = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"WKWebViewJS" ofType:@"js"] encoding:NSUTF8StringEncoding error:nil]; WKUserScript *userScript = [[WKUserScript alloc]initWithSource:jsStr injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO]; [configuration.userContentController addUserScript:userScript]; [configuration.userContentController addScriptMessageHandler:self name:@"imageClick"]; [configuration.userContentController addScriptMessageHandler:self name:@"popToPreviousVC"];
(2)调用JS代码,实现改变字体颜色和大小
- (void)runJavaAcript:(UIButton *)button{ if (button.tag == 0) { [self.webview evaluateJavaScript:@"changeTextColor('#f00')" completionHandler:^(id _Nullable result, NSError * _Nullable error) { }]; }else if (button.tag == 1){ [self.webview evaluateJavaScript:@"changeTextColor('#666')" completionHandler:^(id _Nullable result, NSError * _Nullable error) { }]; }else if (button.tag == 2){ [self.webview evaluateJavaScript:@"changeFontSize(38)" completionHandler:^(id _Nullable result, NSError * _Nullable error) { }]; }else if (button.tag == 3){ [self.webview evaluateJavaScript:@"changeFontSize(12)" completionHandler:^(id _Nullable result, NSError * _Nullable error) { }]; } }
(3)点击webview上的返回按钮pop到上一个VC 1)在html中的定义
//返回标签的定义
返回
//函数实现
function popToPreviousVC(){
webkit.messageHandlers.popToPreviousVC.postMessage(true);
}
2)webview收到回调的处理
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{ if ([message.name isEqualToString:@"imageClick"]) { NSInteger current = [message.body[@"current"] integerValue]; UIAlertView *alert = [[UIAlertView alloc]initWithTitle:[NSString stringWithFormat:@"你点击了第%ld张图片,该图片的坐标是%@",(long)current,message.body[@"rect"]] message:[NSString stringWithFormat:@"图片的地址分别是:%@",message.body[@"srcs"]] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alert show]; }else if([message.name isEqualToString:@"popToPreviousVC"]){ [self.navigationController popViewControllerAnimated:YES]; } }
1、要想接收到回调,一定要先在先添加回调 [configuration.userContentController addScriptMessageHandler:self name:@"popToPreviousVC"]; 2、添加的名字一定要和发送的名字一致
(4)点击webView图片,弹出alert告诉我弹出的是第几张图片,和图片的大小和位置以及所有的图片的地址,回调的信息如上,下面展示js代码
function initImageClick(obj,index) { obj.onclick = function imgOnclick() { //获取image的位置 var rect = obj.getBoundingClientRect(); //获取所有的img标签 var imgs = document.getElementsByTagName('img'); var srcs = new Array(); for(var i in imgs){ //判断img的src是否为未定义,加入srcs数组 if(imgs[i].src != undefined) srcs.push(imgs[i].src); } //由于OC不识别rect这个对象,在这把rect转成了符合CGRect格式的字符串 var message = {'rect':'{{'+rect.left+', '+rect.top+'}, {'+rect.width+', '+rect.height+'}}}'}; //为message这个js对象的属性赋值 message.current = index; message.srcs = srcs; //发送消息 webkit.messageHandlers.imageClick.postMessage(message); } }
代理方法的验证具体看代码