近期项目中要用到html5来实现。涉及到OC调用JS，以及JS调用OC的方法。这里把遇到的问题以及实现方法介绍一下。
//// ViewController.h// OC_And_JS//// Created by 张杰 on 15/7/9.// Copyright © 2015年 张杰. All rights reserved.//#import@interface ViewController : UIViewController @property (weak, nonatomic) IBOutlet UIButton *oc_call_js_no_params;@property (weak, nonatomic) IBOutlet UIButton *oc_call_js_has_params;@property (weak, nonatomic) IBOutlet UIWebView *mWebView;@property (weak, nonatomic) IBOutlet UILabel *js_call_oc_show;- (IBAction)ocCallJsNoParams:(id)sender;- (IBAction)ocCallJsHasParams:(id)sender;@end
//// ViewController.m// OC_And_JS//// Created by 张杰 on 15/7/9.// Copyright © 2015年 张杰. All rights reserved.//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; _mWebView.delegate = self; //打开URL NSString *path = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"]; [self.mWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath: path]]];}- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ NSString *urlstr = request.URL.absoluteString; NSRange range = [urlstr rangeOfString:@"ios://jwzhangjie"]; if (range.length!=0) { _js_call_oc_show.text = [NSString stringWithFormat:@"请訪问地址：%@", urlstr]; } return YES;}-(void)webView:(nonnull UIWebView *)webView didFailLoadWithError:(nullable NSError *)error{ NSLog(@"载入失败");}-(void)webViewDidStartLoad:(nonnull UIWebView *)webView{ NSLog(@"開始载入");}-(void)webViewDidFinishLoad:(nonnull UIWebView *)webView{ NSLog(@"開始结束");// 对于调用js的时候最好这种方法里面或者之后}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}- (IBAction)ocCallJsNoParams:(id)sender { NSString *js = [NSString stringWithFormat:@"ocCallJsNoParamsFunction();"]; [self.mWebView stringByEvaluatingJavaScriptFromString:js];}- (IBAction)ocCallJsHasParams:(id)sender { NSString *js = [NSString stringWithFormat:@"ocCallJsHasParamsFunction('%@','%@');",@"jwzhangjie",@"http://jwzhangjie.cn"]; [self.mWebView stringByEvaluatingJavaScriptFromString:js];}@end function ocCallJsNoParamsFunction(){ alert("OC调用JS中的无參方法"); var e = document.getElementById("js_shouw_text"); e.options.add(new Option("OC调用JS中的无參方法", 2));}function ocCallJsHasParamsFunction(name, url){ alert(name+"的博客地址为："+url); var e = document.getElementById("js_shouw_text"); e.options.add(new Option("OC调用JS中的有參方法", 2));} 规避1：对于OC去调用JS内容最好在 webViewDidFinishLoad方法里或者之后OC与JS互相调用
规避2：在html里面引用js或者css的时候src不要带有路径，由于安装后文件都在同级文件夹以下
规避3：OC调用JS的规范
NSString *js = [NSString stringWithFormat:@"ocCallJsHasParamsFunction('%@','%@');",@"jwzhangjie",@"http://jwzhangjie.cn"]; [self.mWebView stringByEvaluatingJavaScriptFromString:js];规避4：JS调用OC。这里通过html里面发送一个请求，然后在ios中使用 shouldStartLoadWithRequest拦截请求。依据请求url的不同进行处理。
function js_call_oc() { var iFrame; iFrame = document.createElement("iframe"); iFrame.setAttribute("src", "ios://jwzhangjie"); iFrame.setAttribute("style", "display:none;"); iFrame.setAttribute("height", "0px"); iFrame.setAttribute("width", "0px"); iFrame.setAttribute("frameborder", "0"); document.body.appendChild(iFrame); // 发起请求后这个iFrame就没用了。所以把它从dom上移除掉 iFrame.parentNode.removeChild(iFrame); iFrame = null; } - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{ NSString *urlstr = request.URL.absoluteString; NSRange range = [urlstr rangeOfString:@"ios://jwzhangjie"]; if (range.length!=0) { _js_call_oc_show.text = [NSString stringWithFormat:@"请訪问地址：%@", urlstr]; } return YES;} 源代码地址： http://jwzhangjie.cn/forum.php?mod=viewthread&tid=3&page=1&extra=#pid3