ios中webview的高级用法（二）

 框架：

webview与js的通信框架

#import "MJViewController.h"
#import "MBProgressHUD+Add.h"

@interface MJViewController ()

@end

@implementation MJViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    [self loadRemoteHTML];
}

#pragma mark 加载远程的HTML页面
- (void)loadRemoteHTML {
    NSURL *url = [NSURL URLWithString:@"http://192.168.1.106:8080/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://192.168.1.106:8080/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:@"" 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];
}
@end

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