1. 代理

　UIWebViewDelegate

2. 创建

UIWebView myWebView=[[UIWebView alloc] initWithFrame:CGRectMake(, ,self.view.frame.size.width,self.view.frame.size.height)];
myWebView.delegate=self; 
NSURLRequest*request=[NSURLRequest requestWithURL:[NSURL URLWithString:urlStr]]; 

NSURLRequest*request = [NSURLRequest requestWithURL:[NSURL URLWithString:self.m_strUrl] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:5.0];

[myWebView loadRequest:request]; [self.view addSubview:myWebView]; 

3. 代理
 -(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{ 
     NSLog(@"erros is %@",error);
 } 

-(void)webViewDidFinishLoad:(UIWebView *)webView{ 
    NSLog(@"hello"); 
} 

- (void )webViewDidStartLoad:(UIWebView  *)webView{
}
4. 注意
如果 url字符串中如果包含了非法字符或者中文，要使用 
[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]