webview使用

#pragma mark 加载远程的HTML页面
- (void)loadRemoteHTML {
    NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/"];

    self.webView.delegate = self;
    [self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

#pragma mark 加载其他文件
- (void)loadRemoteTxt {
    NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/abc.txt"];

    self.webView.delegate = self;
    [self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

#pragma mark 加载PDF文件
- (void)loadLocalPDF {
    //[self.webView loadData:<#(NSData *)#> MIMEType:<#(NSString *)#> textEncodingName:<#(NSString *)#> baseURL:<#(NSURL *)#>];

    NSURL *url = [NSURL fileURLWithPath:@"/Users/apple/Desktop/第10章-网络.pdf"];

    self.webView.delegate = self;
    [self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

#pragma mark 加载HTML字符串
- (void)loadHTMLString {
    NSURL *url = [NSURL fileURLWithPath:@"/Users/apple/Pictures"];
    [self.webView loadHTMLString:@"<html><body><img src='lufy.png'></body></html>" baseURL:url];
}

#pragma mark - webview代理方法
- (void)webViewDidStartLoad:(UIWebView *)webView {
    NSLog(@"开始加载页面");
    [MBProgressHUD showMessag:@"哥正在帮你加载..." toView:self.view];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSLog(@"页面加载完毕");
    [MBProgressHUD hideHUDForView:self.view animated:YES];

    self.backItem.enabled = self.webView.canGoBack;
    self.forawrdItem.enabled = self.webView.canGoForward;

    self.titleItem.title = [self.webView stringByEvaluatingJavaScriptFromString:@"document.title"];

    //[self.webView stringByEvaluatingJavaScriptFromString:@"fn();"];
}

#pragma mark webview每次加载之前都会调用这个方法
// 如果返回NO，代表不允许加载这个请求
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    // 说明协议头是ios
    if ([@"ios" isEqualToString:request.URL.scheme]) {
        NSString *url = request.URL.absoluteString;
        NSRange range = [url rangeOfString:@":"];
        NSString *method = [request.URL.absoluteString substringFromIndex:range.location + 1];

        SEL selector = NSSelectorFromString(method);

        if ([self respondsToSelector:selector]) {
            [self performSelector:selector];
        }

        return NO;
    }

    return YES;
}

#pragma mark - 提供一个接口方法给JS调用
- (void)openCamera {
    NSLog(@"打开了照相机");
}

- (void)call {
    NSLog(@"打电话");
}

#pragma mark - 按钮方法
#pragma mark 前进
- (void)forawrd {
    [self.webView goForward];
}
#pragma mark 后退
- (void)back {
    [self.webView goBack];
}