最近项目中要用到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。
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//
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// ViewController.h
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// OC_And_JS
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//
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// Created by 张杰 on 15/7/9.
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// Copyright 2015年 张杰. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@interface ViewController : UIViewController <UIWebViewDelegate>
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@property (weak, nonatomic) IBOutlet UIButton *oc_call_js_no_params;
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@property (weak, nonatomic) IBOutlet UIButton *oc_call_js_has_params;
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@property (weak, nonatomic) IBOutlet UIWebView *mWebView;
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@property (weak, nonatomic) IBOutlet UILabel *js_call_oc_show;
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- (IBAction)ocCallJsNoParams:(id)sender;
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- (IBAction)ocCallJsHasParams:(id)sender;
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@end
[objc] view plain copy
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//
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// ViewController.m
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// OC_And_JS
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//
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// Created by 张杰 on 15/7/9.
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// Copyright 2015年 张杰. All rights reserved.
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//
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#import "ViewController.h"
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@interface ViewController ()
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@end
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@implementation ViewController
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- (void)viewDidLoad {
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[super viewDidLoad];
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_mWebView.delegate = self;
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//打开URL
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NSString *path = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];
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[self.mWebView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath: path]]];
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}
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- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
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NSString *urlstr = request.URL.absoluteString;
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NSRange range = [urlstr rangeOfString:@"ios://jwzhangjie"];
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if (range.length!=0) {
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_js_call_oc_show.text = [NSString stringWithFormat:@"请访问地址：%@", urlstr];
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}
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return YES;
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}
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-(void)webView:(nonnull UIWebView *)webView didFailLoadWithError:(nullable NSError *)error{
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NSLog(@"加载失败");
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}
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-(void)webViewDidStartLoad:(nonnull UIWebView *)webView{
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NSLog(@"开始加载");
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}
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-(void)webViewDidFinishLoad:(nonnull UIWebView *)webView{
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NSLog(@"开始结束");
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// 对于调用js的时候最好这个方法里面或者之后
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}
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- (void)didReceiveMemoryWarning {
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[super didReceiveMemoryWarning];
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// Dispose of any resources that can be recreated.
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}
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- (IBAction)ocCallJsNoParams:(id)sender {
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NSString *js = [NSString stringWithFormat:@"ocCallJsNoParamsFunction();"];
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[self.mWebView stringByEvaluatingJavaScriptFromString:js];
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}
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- (IBAction)ocCallJsHasParams:(id)sender {
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NSString *js = [NSString stringWithFormat:@"ocCallJsHasParamsFunction('%@','%@');",@"jwzhangjie",@"http://jwzhangjie.cn"];
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[self.mWebView stringByEvaluatingJavaScriptFromString:js];
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}
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@end
[javascript] view plain copy
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function ocCallJsNoParamsFunction()
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{
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alert("OC调用JS中的无参方法");
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var e = document.getElementById("js_shouw_text");
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e.options.add(new Option("OC调用JS中的无参方法", 2));
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}
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function ocCallJsHasParamsFunction(name, url)
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{
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alert(name+"的博客地址为："+url);
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var e = document.getElementById("js_shouw_text");
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e.options.add(new Option("OC调用JS中的有参方法", 2));
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}
[html] view plain copy
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<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="utf-8">
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<title>OC与JS互相调用</title>
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</head>
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<body>
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<div >
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<select id="js_shouw_text">
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<option>
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展示OC调用JS无参数
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</option>
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</select>
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</div>
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<div>
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<BR/>
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<input type="button" value="JS调用OC方法" onclick="js_call_oc()"/>
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</div>
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<!-- 这里要清楚，虽然test.js跟index.html不同及目录，实际安装到程序里面后，是在同级目录的，所以这里src不能加目录，同样css也是一样的 -->
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<script type="text/javascript" src="test.js" charset="UTF-8"></script>
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<script type="text/javascript">
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function js_call_oc()
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{
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var iFrame;
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iFrame = document.createElement("iframe");
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iFrame.setAttribute("src", "ios://jwzhangjie");
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iFrame.setAttribute("style", "display:none;");
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iFrame.setAttribute("height", "0px");
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iFrame.setAttribute("width", "0px");
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iFrame.setAttribute("frameborder", "0");
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document.body.appendChild(iFrame);
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// 发起请求后这个iFrame就没用了，所以把它从dom上移除掉
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iFrame.parentNode.removeChild(iFrame);
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iFrame = null;
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}
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</script>
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</body>
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</html>
规避1：对于OC去调用JS内容最好在webViewDidFinishLoad方法里或者之后
规避2：在html里面引用js或者css的时候src不要带有路径，因为安装后文件都在同级目录下面
规避3：OC调用JS的规范
[objc] view plain copy
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NSString *js = [NSString stringWithFormat:@"ocCallJsHasParamsFunction('%@','%@');",@"jwzhangjie",@"http://jwzhangjie.cn"];
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[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，根据请求url的不同进行处理。
[javascript] view plain copy
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function js_call_oc()
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{
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var iFrame;
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iFrame = document.createElement("iframe");
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iFrame.setAttribute("src", "ios://jwzhangjie");
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iFrame.setAttribute("style", "display:none;");
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iFrame.setAttribute("height", "0px");
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iFrame.setAttribute("width", "0px");
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iFrame.setAttribute("frameborder", "0");
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document.body.appendChild(iFrame);
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// 发起请求后这个iFrame就没用了，所以把它从dom上移除掉
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iFrame.parentNode.removeChild(iFrame);
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iFrame = null;
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}
[objc] view plain copy
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- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
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NSString *urlstr = request.URL.absoluteString;
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NSRange range = [urlstr rangeOfString:@"ios://jwzhangjie"];
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if (range.length!=0) {
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_js_call_oc_show.text = [NSString stringWithFormat:@"请访问地址：%@", urlstr];
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}
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return YES;
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}
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