webView的使用

最新推荐文章于 2023-02-13 15:41:50 发布

原创最新推荐文章于 2023-02-13 15:41:50 发布 · 204 阅读

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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];  
    }