文章主要是介绍oc如何调用js 以及js的代码调用oc的方法
先上代码后做解释
//oc的.m 的代码
//ps接下来有js的代码一并解析,最后会附上demo
// ViewController.m
// JSAndOC
//
// Created by dongqiangfei on 16/7/21.
// Copyright © 2016年 dongqiangfei. All rights reserved.
//
#import "ViewController.h"
#import <JavaScriptCore/JavaScriptCore.h>
@interface ViewController ()<UIWebViewDelegate>
@property(nonatomic,strong)UIWebView *webView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self makeBtn];
[self makeWeb];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)makeBtn
{
UIButton *thisBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
thisBtn.frame = CGRectMake(100, 100, 140, 40);
[thisBtn addTarget:self action:@selector(ocCallJS) forControlEvents:UIControlEventTouchUpInside];
[thisBtn setTitle:@"点击oc调用js" forState:UIControlStateNormal];
[self.view addSubview:thisBtn];
}
-(void)ocCallJS
{
[self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"showTitleMessage('%@')",@"oc调用了js的内容"]];
}
-(void)makeWeb
{
self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 200, self.view.frame.size.width, self.view.frame.size.height - 200)];
self.webView.backgroundColor = [UIColor whiteColor];
self.webView.scalesPageToFit = YES;
self.webView.delegate = self;
NSString *webPath = [[NSBundle mainBundle] pathForResource:@"ocandjs" ofType:@"html"];
NSURL *webURL = [NSURL fileURLWithPath:webPath];
NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:webURL];
[self.webView loadRequest:URLRequest];
[self.view addSubview:self.webView];
JSContext *content = [self.webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
content[@"bdgt"] = ^() {
NSLog(@"js调用oc---------begin--------");
NSArray *thisArr = [JSContext currentArguments];
for (JSValue *jsValue in thisArr) {
NSLog(@"=======%@",jsValue);
}
//JSValue *this = [JSContext currentThis];
//NSLog(@"this: %@",this);
NSLog(@"js调用oc---------The End-------");
[self.webView stringByEvaluatingJavaScriptFromString:@"show();"];
};
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
//js的代码
<html>
<!--描述网页信息-->
<head>
<meta charset="UTF-8"/>
<title>iOS上webView与JS交互的之oc调用js的demo</title>
<script>
function show()
{
alert('js调用了oc的代码');
}
function showTitle()
{
alert(document.title);
}
function showTitleMessage(message)
{
alert(message);
}
function repost()
{
location.href = "http://www.iosxxx.com";
}
function sum()
{
return 1 + 1;
}
function btnClick()
{
bdgt("hello world");
<!--xmg://sendMessageWithNumber_andContent_?10086&love-->
location.href = "xmg://callWithNumber_?15830654880";
}
</script>
</head>
<!--网页具体内容-->
<body>
<br>下面是网页</br><br/>
<button style = "background: yellow; height: 150px; width: 350px;" onclick = "btnClick();">点击按钮js调用oc</button>
</body>
</html>
解析oc调用js的方法
知道的这么一种方法如下:
[self.webView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"showTitleMessage('%@')",@"oc调用了js的内容"]];
对应
function showTitleMessage(message)
或者
[self.webView stringByEvaluatingJavaScriptFromString:@"show();"];
对应
function show()
这个方法都对应js的相应的方法.如上
使用oc调动js 注意写法如:
[NSString stringWithFormat:@"showTitleMessage('%@')",@"oc调用了js的内容"]不能写成
[NSString stringWithFormat:@"showTitleMessage(%@)",@"oc调用了js的内容"],否则调不起.
js调用 oc 的方法
这个主要是指的点击网页上的特定的方法调用原生的的特定方法 这个有一种简单粗暴地方法,不懂得名字, 就是直接吊起的如
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
if ([[NSString stringWithFormat:@"%@",request.URL] isEqualToString:@"特定的连接"]) {
NSLog(@"吊起oc的方法");
}
return NO;//不加载网页
return YES;//加载网页
}
直接在点击网页的某个方法加载网页之前,在代理中拿到将要加载的网页,去做相应的判断.最早就是这样做,也有局限性吧,但是这样感觉比单纯的js调用原生效率要高点.
接下来言归正传介绍正宗的js如何调用oc
如下核心方法也就这么点
JSContext *content = [self.webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];
content[@"bdgt"] = ^() {
NSLog(@"js调用oc---------begin--------");
NSArray *thisArr = [JSContext currentArguments];
for (JSValue *jsValue in thisArr) {
NSLog(@"=======%@",jsValue);
}
//JSValue *this = [JSContext currentThis];
//NSLog(@"this: %@",this);
NSLog(@"js调用oc---------The End-------");
[self.webView stringByEvaluatingJavaScriptFromString:@"show();"];
};
本文摘自iOS攻城狮：