UIWebView的使用详解手机开发

 
@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