OC与JS互相调用

发布时间：2020-08-09 08:23:48 作者：卓行天下
来源：网络阅读：455

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。

//
// ViewController.h
// OC_And_JS
//
// Created by 张杰 on 15/7/9.
// Copyright 2015年张杰. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController <UIWebViewDelegate>
@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

[objc] view plain copy

//
// 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:@"请访问地址：%@", urlstr];
}
return YES;
}
-(void)webView:(nonnull UIWebView *)webView didFailLoadWithError:(nullable NSError *)error{
NSLog(@"加载失败");
}
-(void)webViewDidStartLoad:(nonnull UIWebView *)webView{
NSLog(@"开始加载");
}
-(void)webViewDidFinishLoad:(nonnull UIWebView *)webView{
NSLog(@"开始结束");
// 对于调用js的时候最好这个方法里面或者之后
}
- (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

[javascript] view plain copy

function ocCallJsNoParamsFunction()
{
alert("OC调用JS中的无参方法");
var e = document.getElementById("js_shouw_text");
e.options.add(new Option("OC调用JS中的无参方法", 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中的有参方法", 2));
}

[html] view plain copy

<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>OC与JS互相调用</title>
</head>
<body>
<div >
<select id="js_shouw_text">
<option>
展示OC调用JS无参数
</option>
</select>
</div>
<div>
<BR/>
<input type="button" value="JS调用OC方法" onclick="js_call_oc()"/>
</div>
<script type="text/javascript" src="test.js" charset="UTF-8"></script>
<script type="text/javascript">
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;
}
</script>
</body>
</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

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，根据请求url的不同进行处理。

[javascript] view plain copy

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;
}

[objc] view plain copy

- (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:@"请访问地址：%@", urlstr];
}
return YES;
}

OC与JS互相调用

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