iOS UIWebView

//1. webView当网址没有http://会加载失败，解决方法

 if(![url hasPrefix:@"http://"]){

        url = [@"http://" stringByAppendingString:url];

    }

//2.有时候因为编码问题加载失败，使用

    NSString *urlString = [url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];