在屏幕外动画UInavigationBar会留下黑色矩形

Question

当模态UIView出现时,我想将UINavigationBar放到屏幕上,就像在Reeder中一样.

我正在使用优秀的SVWebViewController(https://github.com/samvermette/SVWebViewController)来处理从shouldStartLoadWithRequest创建Web浏览器

动画代码来自http://www.theappcodeblog.com/2011/06/02/iphone-app-animation-tutorial-animate-a-uiview-frame/

一切正常,因为导航栏被放置在屏幕外,但留下的空间(我想将其设置为动画)是黑色的.视图/ webview的其余部分是WHITE.

如何将空间分配给导航栏白色,即视图的背景为白色？没有xib.

我在SVWebViewController中找不到任何提示导航栏(只添加一个工具栏)

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSLog(@"They clicked: %@", request);

    NSURL *requestURL = [request URL];

    if ([[requestURL scheme ] isEqualToString: @"http"] || [[requestURL scheme] isEqualToString: @"https"]) {


            NSLog(@"Web link %@",requestURL);

            SVModalWebViewController *webViewController = [[SVModalWebViewController alloc] initWithURL:requestURL];
            webViewController.modalPresentationStyle = UIModalPresentationFullScreen;
            webViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

            webViewController.availableActions = SVWebViewControllerAvailableActionsOpenInSafari | SVWebViewControllerAvailableActionsCopyLink | SVWebViewControllerAvailableActionsMailLink;

            // ios5

            if ([[UINavigationBar class]respondsToSelector:@selector(appearance)]) {

                // Create image for navigation background - portrait
                UIImage *NavigationPortraitBackground = [[UIImage imageNamed:@"navbar_bg_portrait~iPad"]
                                                         resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];

                // Create image for navigation background - landscape
                UIImage *NavigationLandscapeBackground = [[UIImage imageNamed:@"navbar_bg_portrait~iPad"]
                                                          resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];

                // Set the background image all UINavigationBars
                [[UINavigationBar appearance] setBackgroundImage:NavigationPortraitBackground forBarMetrics:UIBarMetricsDefault];
                [[UINavigationBar appearance] setBackgroundImage:NavigationLandscapeBackground forBarMetrics:UIBarMetricsLandscapePhone];

                [[UINavigationBar appearance] setBackgroundColor:[UIColor whiteColor]];

                // The tintcolor affects the button colour
                UIColor* col = OPAQUE_HEXCOLOR(0xdb536a);
                [[UIBarButtonItem appearance] setTintColor:col];

            } else {

                // Style the Nav Bar ios4
                [webViewController.navigationBar applyCustomTintColor];

            }
            [self presentModalViewController:webViewController animated:YES];


            // -> This code hides the UINavigationBar before animation

            CGRect navBarFrame = webViewController.navigationBar.frame;

            navBarFrame.origin.y = -navBarFrame.size.height;

            // set the position of the bar
            webViewController.navigationBar.frame = navBarFrame;

            // <- end Hide code


            return NO;

        }

    return YES;
}

TIA

Answer 1

如果为UINavigationBar设置动画,则更改留下区域颜色的答案是

self.navigationController.view.backgroundColor = [UIColor redColor];