webView的使用

来源：互联网发布：淘宝木偶困境编辑：程序博客网时间：2024/06/16 14:35

1 加载WebView

@property (weak, nonatomic) IBOutlet UIWebView *webView;

- (void)viewDidLoad  {      [super viewDidLoad];      webView = [[UIWebView alloc] initWithFrame:CGRectMake(SCREEN_WIDTH/2.0-25, SCREEN_HEIGHT/2.0-25, 60, 60)];      NSURLRequest *request =[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];      [self.view addSubview: webView];      [webView loadRequest:request];  }

2、实现协议
UIWebView中几个重要的函数
1).- (void )webViewDidStartLoad:(UIWebView *)webView 网页开始加载的时候调用
2).- (void )webViewDidFinishLoad:(UIWebView *)webView 网页加载完成的时候调用
3).- (void)webView:(UIWebView )webView didFailLoadWithError:(NSError )error 网页加载错误的时候调用
3、加载等待loading界面

- (void) webViewDidStartLoad:(UIWebView *)webView  {      //创建UIActivityIndicatorView背底半透明View           UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)];        [view setTag:108];        [view setBackgroundColor:[UIColor blackColor]];        [view setAlpha:0.5];        [self.view addSubview:view];        activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)];        [activityIndicator setCenter:view.center];        [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];        [view addSubview:activityIndicator];        [activityIndicator startAnimating];    }

加载完成或失败时，去掉loading效果

- (void) webViewDidFinishLoad:(UIWebView *)webView  {      [activityIndicator stopAnimating];      UIView *view = (UIView*)[self.view viewWithTag:108];      [view removeFromSuperview];      NSLog(@"webViewDidFinishLoad");  }  - (void) webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error  {      [activityIndicator stopAnimating];      UIView *view = (UIView*)[self.view viewWithTag:108];      [view removeFromSuperview];      }

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