IOS-WKWebView的使用以及Cookie的处理
其实和UIWebView的用法没什么区别，但是WKWebView相对于UIWebView强大了很多，内存的消耗相对少了，所提供的接口也丰富了。
WKWebView的代理方法：
WKNavigationDelegate代理的使用：
该代理提供的方法，可以用来追踪加载过程（页面开始加载、加载完成、加载失败）、决定是否执行跳转。
// 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;页面跳转的代理方法有三种，分为（收到跳转与决定是否跳转两种）
// 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;
// 在发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
代理方法的展开：
#pragma mark - WKNavigationDelegate -
/**
* 页面开始加载时调用
*
* @param webView 实现该代理的webview
* @param navigation 当前navigation
*/
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
NSLog(@"%s", __FUNCTION__);
}
/**
* 当内容开始返回时调用
*
* @param webView 实现该代理的webview
* @param navigation 当前navigation
*/
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
NSLog(@"%s", __FUNCTION__);
}
/**
* 页面加载完成之后调用
*
* @param webView 实现该代理的webview
* @param navigation 当前navigation
*/
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
self.progressView.alpha = 0;
NSLog(@"%s", __FUNCTION__);
}
/**
* 加载失败时调用
*
* @param webView 实现该代理的webview
* @param navigation 当前navigation
* @param error 错误
*/
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error
{
NSLog(@"%s", __FUNCTION__);
}
/**
* 接收到服务器跳转请求之后调用
*
* @param webView 实现该代理的webview
* @param navigation 当前navigation
*/
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
NSLog(@"%s", __FUNCTION__);
}
/**
* 在收到响应后，决定是否跳转
*
* @param webView 实现该代理的webview
* @param navigationResponse 当前navigation
* @param decisionHandler 是否跳转block
*/
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
NSString *clickUrl = [navigationResponse.response.URL absoluteString];
self.barView.addressLabel.text = clickUrl;
NSLog(@"%@", navigationResponse.response.URL);
decisionHandler(WKNavigationResponsePolicyAllow);
}
/**
* 在发送请求之前，决定是否跳转
*
* @param webView 实现该代理的webview
* @param navigationAction 当前navigation
* @param decisionHandler 是否调转block
*/
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
decisionHandler(WKNavigationActionPolicyAllow);
}WKUIDelegate代理的使用：
// 创建一个新的WebView
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
剩下三个代理方法全都是与界面弹出提示框相关的，针对于web界面的三种提示框（警告框、确认框、输入框）分别对应三种代理方法。下面只举了警告框的例子。
#pragma mark - WKUIDelegate
/**
* web界面中有弹出警告框时调用
*
* @param webView 实现该代理的webview
* @param message 警告框中的内容
* @param frame 主窗口
* @param completionHandler 警告框消失调用
*/
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"温馨提示" message:message preferredStyle:(UIAlertControllerStyleAlert)];
UIAlertAction *trueAction = [UIAlertAction actionWithTitle:@"确定" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action) {
}];
[alertController addAction:trueAction];
[self presentViewController:alertController animated:YES completion:nil];
completionHandler(YES);
}
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler {
} WKScriptMessageHandler代理的使用：
这个协议中包含一个必须实现的方法，这个方法是提高App与web端交互的关键，它可以直接将接收到的JS脚本转为OC或Swift对象。（当然，在UIWebView也可以通过“曲线救国”的方式与web进行交互，著名的Cordova框架就是这种机制）。
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
NSLog(@"%@", message);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}WKWebView加载JS：
// 图片缩放的js代码
NSString *js = @"var count = document.images.length;for (var i = 0; i < count; i++) {var image = document.images[i];image.style.width=320;};window.alert('找到' + count + '张图');";
// 根据JS字符串初始化WKUserScript对象
WKUserScript *script = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
// 根据生成的WKUserScript对象，初始化WKWebViewConfiguration
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
[config.userContentController addUserScript:script];
_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
[_webView loadHTMLString:@""baseURL:nil];
[self.view addSubview:_webView];WKWebView的Cookie问题：
<参考链接如下几个>
WKWebView从入门到趟坑：
http://www.jianshu.com/p/90a90bd13aac
iOS开发WKWebView Cookie的读取与写入,与UIWebView的Cookie共享：
http://www.skyfox.org/ios-wkwebview-cookie-opration.html