@interface ViewController ()<UIWebViewDelegate>
@property (weak, nonatomic) IBOutlet UIBarButtonItem *backItem;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *forwardItem;
@property(nonatomic,weak)UIWebView * webView;
- (IBAction)back;
- (IBAction)forward;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    //1.创建webView
    UIWebView * webView = [[UIWebView alloc]init];
    webView.frame = self.view.bounds;
    self.webView = webView;
    [self.view addSubview:webView];
    //设置代理
    webView.delegate = self;
    
    
    //2.加载请求
    //加载的三种方式，加载三种数据
    
    //《1》加载url请求
//        NSURL * url = [[NSBundle mainBundle]URLForResource:@"login" withExtension:@"html"];
//        NSURLRequest * request = [NSURLRequest requestWithURL:url];
//        [webView loadRequest:request];
    
    //《2》加载html（用于显示传递过来的内容，因为loadHTMLString传递的是什么，就显示什么）(这种方式加载的网页，不能回退)
//    NSString * path = [[NSBundle mainBundle]pathForResource:@"login.html" ofType:nil];
//    NSString * string = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
//    NSLog(@"----%@", string);
//    [webView loadHTMLString:string baseURL:nil];
    
    
    
    //《3》加载data数据（可以加载图片，word，pdf等）（这个方法加载的也不能回退）
    
    //获取路径
    NSString * path = [[NSBundle mainBundle]pathForResource:@"hell" ofType:@"pdf"];
    //获取mimetype
    NSURL * url = [NSURL fileURLWithPath:path];//不要使用urlWithString方法
    NSURLRequest * request = [NSURLRequest requestWithURL:url];
    NSURLResponse  * rest = nil;
    [NSURLConnection  sendSynchronousRequest:request returningResponse:&rest error:nil];//因为需要使用这个返回值，所以使用同步方法
    //加载
    NSData * data = [NSData dataWithContentsOfFile:path];
    [webView loadData:data MIMEType:rest.MIMEType textEncodingName:@"utf8"baseURL:nil];
    NSLog(@"MIMEType-----%@",rest.MIMEType);
    NSLog(@"%ld",data.length);
    
    
    
}


- (IBAction)back{
    [self.webView goBack];//不使用dismiss方法,因为跳转的不是控制器
    
}

- (IBAction)forward {
    [self.webView goForward];//前进
}



#pragma mark - UIWebViewDelegate(四个代理方法)
- (void)webViewDidStartLoad:(UIWebView *)webView{
//    NSLog(@"webViewDidStartLoad");
    
}
- (void)webViewDidFinishLoad:(UIWebView *)webView{
    //    if ([webView canGoBack]) {//先判断这个页面有没有返回功能
    //        self.backItem.enabled = YES;
    //    }else{
    //    self.backItem.enabled = NO;
    //    }
    
    //简便写法
    NSLog(@"########%i", [webView canGoBack]);
    self.backItem.enabled = [webView canGoBack];
    self.forwardItem.enabled = [webView canGoForward];
    
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
//    NSLog(@"didFailLoadWithError");
}


- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    //URL
    //"http://www.baidu.com/"
    //协议头://主机名//路径
    
    //过滤掉还有baidu的url
//    NSString * path = request.URL.absoluteString;//注意不是URL.path这个方法，这个方法返回的是“/”
//    NSInteger location = [path rangeOfString:@"baidu"].location;
//    if (location != NSNotFound) {
//        return NO;
//    }
    
    NSLog(@"%@", request.URL.absoluteString);
    return YES;
    
}

@end