项目问题：在打开的UIWebView中有新的链接，点击打开后会出现空白现象。

解决办法：在点击新的链接时重现跳转到一个新的界面

声明两个属性：

@property (nonatomic,assign) BOOL isLoad;
@property (nonatomic,strong) NSString *loadedURL;

首先实现UIWebView的代理

webview.delegate = self;

在UIWebView的代理方法中实现：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    if (navigationType != UIWebViewNavigationTypeOther) {
        self.loadedURL = request.URL.absoluteString;
    }
    if (!_isLoad && [request.URL.absoluteString isEqualToString:self.loadedURL]) {
        [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
            if (connectionError || ([response respondsToSelector:@selector(statusCode)] && [((NSHTTPURLResponse *)response) statusCode] != 200 && [((NSHTTPURLResponse *)response) statusCode] != 302)) {
                //Show error message
                //[self showErrorMessage];
            } else {
                _isLoad = YES;
                [self showPage:self.loadedURL query:nil];
            }
        }];
        return NO;
    }
    _isLoad = NO;
    return YES;
}
//新开界面
-(void)showPage:(NSString *)url query:(NSString *)query
{
    NSString *newUrl = [NSString stringWithFormat:@"%@", url];
    if (query) {
        newUrl = [NSString stringWithFormat:@"%@?%@", url,query];
    }
    RootWebViewControl *webView = [[RootWebViewControl alloc]init];
    webView.url = newUrl;
    webView.isShowCloseBtn = YES;
    [self.navigationController pushViewController:webView animated:YES];
}
- (void)viewWillAppear:(BOOL)animated
{
    _isLoad = NO;
    [super viewWillAppear:animated];
}

done!