IOS开发 UIWebView使用详解(2)

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一、UIWebView的基本使用

UIWebView 的四个代理方法：

#pragma mark UIWebViewDelegate//即将请求网页-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSLog(@"Request URL %@",request.URL);    return YES;}//开始加载网面-(void)webViewDidStartLoad:(UIWebView *)webView{    NSLog(@"webViewDidStartLoad");}//网页加载完成-(void)webViewDidFinishLoad:(UIWebView *)webView{    NSLog(@"webViewDidFinishLoad");}//网页加载出错-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{     NSLog(@"didFailLoadWithError");}

UIWebView常用方法

- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.    //加载URL    NSURL *url = [[NSURL alloc] initWithString:@"http://www.baidu.com"];    NSURLRequest *req = [[NSURLRequest alloc] initWithURL:url];      //加载本地HTML    NSString *localHTMLPageFilePath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];    NSURL *localHTMLPageFileURL = [NSURL fileURLWithPath:localHTMLPageFilePath];    req = [NSURLRequest requestWithURL:localHTMLPageFileURL];        //禁止webveiw滚动    //self.webView.scrollView.bounces = NO;        //设置webview的背景颜色    //[self.webView setBackgroundColor:[UIColor blueColor]];        //移除滚动后的外边阴影    UIScrollView *scrollView = self.webView.scrollView;    for (int i = 0; i < scrollView.subviews.count ; i++) {        UIView *view = [scrollView.subviews objectAtIndex:i];        if ([view isKindOfClass:[UIImageView class]]) {            view.hidden = YES ;        }    }        [self.webView loadRequest:req];}

js与oc交互

点击html中的按钮弹出原生的提示框，实现的代码如下，html页面

<!DOCTYPE html><html>    <head>        <title>html</title>        <meta charset="utf-8">        <script type="text/javascript">            function sendMsg(cmd,param){                var url = "JS2OC://"+cmd+":"+param;                document.location = url;            }        </script>    </head>    <body>               UserName <input type="text" id="input"><br/>        <input type="button" value="SendMsg" onclick="sendMsg('alert','hello')">    </body></html>

在ViewController.m文件中编写

#pragma mark UIWebViewDelegate//即将请求网页-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{    NSLog(@"Request URL %@",request.URL);    NSString *url =[[request URL] absoluteString];    if([url hasPrefix:@"JS2OC://"])    {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"JS调用OC" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];        [alert show];        }            return YES;}

实现的效果如下图

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