oc调javascript方法，evaluateJavaScript:&&js给oc发通知
在ios8中引入了WKWebView控件，通过在头文件引用
#import <WebKit/WebKit.h>来使用该控件，
这个控件与oc的原生控件uiwebview很相似，它更方便oc与js的相互通讯。
1.oc调用js方法例子：
通过方法：
- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id,NSError*))completionHandler;
调用js中的方法，例如我们可以这样使用这个方法：
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
NSString *promptCode = [NSStringstringWithFormat:@"mymethd(\"%@\")",self.data];
[_theWebView evaluateJavaScript:promptCode completionHandler:^(id object,NSError *error) { }];
}
当wkwebview把html加载完之后，调用此方法，其中@"mymethd(\"%@\")"，是方法名和要传的参数
2.js给oc发送通知例子：
- (void)viewDidLoad {
NSString *path = [[NSBundlemainBundle]pathForResource:@"htmlname"ofType:@"html"];
NSURL *url = [NSURLfileURLWithPath:path];
NSURLRequest *request = [NSURLRequestrequestWithURL:url];
WKWebViewConfiguration *theConfiguration =
[[WKWebViewConfigurationalloc]init];
[theConfiguration.userContentController
addScriptMessageHandler:selfname:@"myName"];
_theWebView = [[WKWebViewalloc]initWithFrame:self.view.frame
configuration:theConfiguration];
_theWebView.navigationDelegate =self;
／／- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation方法代理
[_theWebViewloadRequest:request];
[self.viewaddSubview:_theWebView];
}
在js方法中这样给oc发送通知：
function postMyMessageA()
{
var message = {'message' :'You choose the A'};
window.webkit.messageHandlers.myName.postMessage(message);
}
这是oc中收到通知后回调的方法：
- (void)userContentController:(WKUserContentController *)userContentController
didReceiveScriptMessage:(WKScriptMessage *)message
{
NSDictionary * messageDic = [[NSDictionaryalloc]initWithDictionary:message.body];
NSString * messageStr = [messageDicobjectForKey:@"message"];
UIAlertView * messAlert = [[UIAlertViewalloc]initWithTitle:nilmessage:messageStrdelegate:nilcancelButtonTitle:@"yes"otherButtonTitles:nil,nil];
[messAlertshow];
}