网页显示UIWebView（一个）

1.scalesPageToFit设置为YES，这样web页面会依据屏幕大小进行自己主动缩放。

2.UIWebView的状态监视

//内容读入開始前被调用。将UIWebView，返回no后UIWebView不进行读入处理。假设想在单击链接时进行独自处理则处理

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;

//内容读入開始后被调用

- (void)webViewDidStartLoad:(UIWebView *)webView;

//内容读入结束后被调用

- (void)webViewDidFinishLoad:(UIWebView *)webView;

//内容读入过程中发生错误后被调用。可多次调用

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;

webViewController.h中的代码。 

@interface webViewController : UIViewController<UIWebViewDelegate>
{
    UIActivityIndicatorView *activityIndicatorView;
}
@property(nonatomic,strong) UIWebView * webView;
@end

webViewController.m中的代码。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.title = @"明白显示通信状态";
    //UIWebView的设置
    _webView =[[UIWebView alloc]init];
    _webView.delegate = self;
    _webView.frame = self.view.bounds;
    _webView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
    _webView.scalesPageToFit = YES;
    [self.view addSubview:_webView];
    
    //工具条中加入活动指示器
    activityIndicatorView = [[UIActivityIndicatorView alloc]init];
    activityIndicatorView.frame = CGRectMake(0, 0, 20, 20);
    UIBarButtonItem *indicator = [[UIBarButtonItem alloc]initWithCustomView:activityIndicatorView];
    UIBarButtonItem *adjustment = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
    NSArray *buttons = [NSArray arrayWithObjects:adjustment,indicator,adjustment, nil];
    [self setToolbarItems:buttons animated:YES];

}

-(void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    //显示web页面
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];
    [_webView loadRequest:request];
}

-(void)webViewDidStartLoad:(UIWebView *)webView
{
    [activityIndicatorView startAnimating];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
    [activityIndicatorView stopAnimating];
    
}
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    [activityIndicatorView stopAnimating];
    UIAlertView * alerView = [[UIAlertView alloc]initWithTitle:@"网络问题" message:@"请检查网络" delegate:self cancelButtonTitle:@"删除" otherButtonTitles:@"确定", nil];
    [self.view addSubview:alerView];
    [alerView show];
    
}

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