bug 漂流记一。

- (void)loadView
{   
//    mainWebView = [[UIWebView alloc] init];
    mainWebView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    mainWebView.delegate = self;
    mainWebView.scalesPageToFit = YES;
    mainWebView.opaque = NO;
    mainWebView.scrollView.scrollEnabled = NO;
    [mainWebView addSubview:self.closeButton];
    
    self.tapGes = [[UITapGestureRecognizer alloc] initWithTarget:self
                                                          action:@selector(tapAction:)];
    self.tapGes.delegate = self;
    [mainWebView addGestureRecognizer:self.tapGes];
//    self.view = mainWebView;
    [self.navigationController.view addSubview:mainWebView];
}