1.scalesPageToFit設置為YES，這樣web頁面會依據屏幕大小進行自己主動縮放。

2.UIWebView的狀態監視

//內容讀入開始前被調用。將UIWebView，返回no后UIWebView不進行讀入處理。假設想在單擊鏈接時進行獨自處理則處理

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

//內容讀入開始后被調用

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

//內容讀入結束后被調用

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

//內容讀入過程中發生錯誤后被調用。可多次調用

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

webViewController.h中的代碼。?

@interface webViewController : UIViewController<UIWebViewDelegate> {UIActivityIndicatorView *activityIndicatorView; } @property(nonatomic,strong) UIWebView * webView; @end webViewController.m中的代碼。 - (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.self.title = @"明白顯示通信狀態";//UIWebView的設置_webView =[[UIWebView alloc]init];_webView.delegate = self;_webView.frame = self.view.bounds;_webView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;_webView.scalesPageToFit = YES;[self.view addSubview:_webView];//工具條中加入活動指示器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];//顯示web頁面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:@"網絡問題" message:@"請檢查網絡" delegate:self cancelButtonTitle:@"刪除" otherButtonTitles:@"確定", nil];[self.view addSubview:alerView];[alerView show];}

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