打开以http开头但不以www开头的链接

我想打开以 www 开头的链接，但他们打不开。我的代码仅适用于http。请帮助 > 我是 iOS 新手。我将非常感激。

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

    if (navigationType == UIWebViewNavigationTypeLinkClicked) {
        NSLog("User tapped a link.");
    }

    if ([request.URL.absoluteString rangeOfString:@"iosscrollposition:"].location != NSNotFound) {
        NSString *positionString=[[[request URL]absoluteString] stringByReplacingOccurrencesOfString:@"iosscrollposition:" withString:@""];
        NSArray *positionArray=[NSArray arrayWithArray:[positionString componentsSeparatedByString:@","]];
        NSInteger x=[[positionArray objectAtIndex:0] integerValue];
        NSInteger y=[[positionArray objectAtIndex:1] integerValue];
        if (initialYPosition != y || y==0) {
            if (initialYPosition!=0 ||x==0) {
                [myScrollView setContentOffset:CGPointMake(myScrollView.contentOffset.x,myScrollView.contentOffset.y+20) animated:NO];
            }
            initialYPosition=y;
        }
        if (x>320) {
            [webViewScrollView setContentOffset:CGPointMake(x-300,webViewScrollView.contentOffset.y) animated:NO];
        } else if(x<320) {
            [webViewScrollView setContentOffset:CGPointMake(0,webViewScrollView.contentOffset.y) animated:NO];
        }
        return NO;
    } else if([request.URL.absoluteString rangeOfString:@"http://"].location == NSNotFound) {
        return YES;
    } else {
        return NO;
    }
}

NSURL *url=[NSURL URLWithString:@"http://"];

[self.myWebView loadHTMLString:tempString baseURL:url];