1、准备一个本地化的html网页,如jsIOS.html
<script type="text/javaScript">
function postStr(){
return document.getElementById("text1").value
//return "javaScript返回值啦"
}
</script>
2、将此html文件放到项目代码目录里面,如图:
3、拖一个UIWebView控件和UIButton控件到xxxViewController对应的.xib或.storyboard视图的UIView上;
在xxxViewController的.h文件中分别声明UIWebView类型变量和UIButton类型的变量,以及一个按钮点击事件(并且跟视图里面的控件连线),
并且添加一个UIWebViewDelegate类型的委托。<喎�"http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+eHh4Vmlld0NvbnRyb2xsZXIuaM7EvP7E2sjdyOfPwqO6PC9wPgo8cD48L3A+CjxwIGNsYXNzPQ=="p1">
#import
@interface ViewController : UIViewController
@property(nonatomic,retain) IBOutlet UIWebView *webview
@property(nonatomic,retain) IBOutlet UIButton *button
-(IBAction)IOS_JS:(id)sender
@end
4、在xxxViewController.m文件中实现通过点击事件,调用javaScript的方法并取得返回值。
代码如下:
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
@synthesize webview
- (void)viewDidLoad
{
[super viewDidLoad]
//设置webView
webview.backgroundColor = [UIColor clearColor]
//webview.scalesPageToFit =YES
webview.delegate =self
//找到jsIOS.html文件的路径
NSString *basePath = [[NSBundle mainBundle]bundlePath]
NSString *helpHtmlPath = [basePath stringByAppendingPathComponent:@"jsIOS.html"]
NSURL *url = [NSURL fileURLWithPath:helpHtmlPath]
//加载本地html文件
[webview loadRequest:[NSURLRequest requestWithURL:url]]
}
/*
* 点击事件
* 调用javaScript的方法postStr()并取得返回值
* 输出返回值到控制台
*/
-(IBAction)IOS_JS:(id)sender
{
NSString *str = [self.webview stringByEvaluatingJavaScriptFromString:@"postStr()"]
NSLog(@"JS返回值:%@",str)
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning]
}
@end
使用示例: 下面的示例代码将调用上面NativeOcClass的方法,在js层只需要这样调用: var ret = jsb.reflection.callStaticMethod("NativeOcClass", "callNativeUIWithTitle:andContent:", "cocos2d-js", "Yes! you call a Native UI from Reflect.基本流程:先看一下Web中,我们给h1标签添加一个onclick事件,让它在被点击之后,修改当前的url。
Web中的HTML代码:
<html>
<head>
<script>
function getInfo(name)
{
window.location = "/getInfo/"+name
}
</script>
</head>
<body>
<h1 onclick="getInfo('why')">Name</h1>
</body>
</html>
iOS中,先拖拽WebView,访问localhost,然后通过WebView的委托事件监听url跳转操作,并且把跳转截取下来。
也就是说,在onclick的时候,普通浏览器灰跳转到那个url,但是在iOS的这个WebView里面,这个跳转会被拦截,
用这种方式可以巧妙地实现JS调用iOS的原生代码:
//
// DWViewController.m
// DareWayApp
//
// Created by why on 14-6-3.
// Copyright (c) 2014年 DareWay. All rights reserved.
//
#import "DWViewController.h"
@interface DWViewController ()
@property (weak, nonatomic) IBOutlet UIWebView *myWebview // 主页面
@end
@implementation DWViewController
- (void)viewDidLoad
{
[super viewDidLoad]
// Do any additional setup after loading the view, typically from a nib.
// 适配iOS6的状态栏
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
_myWebview.frame = CGRectMake(0,20,self.view.frame.size.width,self.view.frame.size.height-20)
}
// 加载制定的URL
NSURL *url =[NSURL URLWithString:@"http://localhost"]
NSURLRequest *request =[NSURLRequest requestWithURL:url]
[_myWebview setDelegate:self]
[_myWebview loadRequest:request]
}
// 网页中的每一个请求都会被触发
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
// 每次跳转时候判断URL
if([request.mainDocumentURL.relativePath isEqualToString:@"/getInfo/why"])
{
NSLog(@"why")
return NO
}
return YES
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning]
// Dispose of any resources that can be recreated.
}
@end