ios UIWebView

UIWebView的使用说明：
**1、显示网页： **

// 1.创建webview，并设置大小，"20"为状态栏高度
    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建请求
    NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.cnblogs.com/mddblog/"]];
    // 3.加载网页
    [webView loadRequest:request];

    // 最后将webView添加到界面
    [self.view addSubview:webView];

2、UIWebView不仅可以加载HTML页面，还支持pdf、word、txt、各种图片等等的显示。下面以加载mac桌面上的png图片

3、 代理协议使用：UIWebViewDelegate

/// 是否允许加载网页，也可获取js要打开的url，通过截取此url可与js交互
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {

    NSString *urlString = [[request URL] absoluteString];
    urlString = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSArray *urlComps = [urlString componentsSeparatedByString:@"://"];
    NSLog(@"urlString=%@---urlComps=%@",urlString,urlComps);
    return YES;
}
/// 开始加载网页
- (void)webViewDidStartLoad:(UIWebView *)webView {
    NSURLRequest *request = webView.request;
    NSLog(@"webViewDidStartLoad-url=%@--%@",[request URL],[request HTTPBody]);
}
/// 网页加载完成
- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSURLRequest *request = webView.request;
    NSURL *url = [request URL];
    if ([url.path isEqualToString:@"/normal.html"]) {
        NSLog(@"isEqualToString");
    }
    NSLog(@"webViewDidFinishLoad-url=%@--%@",[request URL],[request HTTPBody]);
    NSLog(@"%@",[self.webView stringByEvaluatingJavaScriptFromString:@"document.title"]);
}
/// 网页加载错误
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    NSURLRequest *request = webView.request;
    NSLog(@"didFailLoadWithError-url=%@--%@",[request URL],[request HTTPBody]);

}