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];

}