删除导航栏下方的阴影线而不删除栏颜色？

Question

我尝试了许多类似问题中显示的答案，但没有一个对我有用。我正在尝试删除导航栏 1px 阴影，但我尝试的一切最终都删除了栏颜色并使其变为白色/一些浅色。知道如何删除它（在 App Delegate 中？）

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {


    let redPart: CGFloat = CGFloat(65) / 255
    let greenPart: CGFloat = CGFloat(107) / 255
    let bluePart: CGFloat = CGFloat(166) / 255
    UINavigationBar.appearance().shadowImage = UIImage()
    UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)

    UINavigationBar.appearance().barTintColor = UIColor(red: redPart, green: greenPart, blue: bluePart, alpha: 1.0)
    //Set the colors for bar button items and text
    UINavigationBar.appearance().tintColor = UIColor.whiteColor()
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whiteColor(), NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 22)!]



    // Override point for customization after application launch.
    NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(AppDelegate.checkForReachability(_:)), name: kReachabilityChangedNotification, object: nil);

    self.reachability = Reachability.reachabilityForInternetConnection();

    self.reachability!.startNotifier()


    return true
}

上面是我的代码，这是我尝试过的：

UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: .Default)

但是每次，无论它在哪条线上，栏都会开始看起来像这样，而不是我设置的蓝色......

Answer 1

你用来去除阴影的线条很好

UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: .Default)

但您还需要确保导航栏不是半透明的（默认情况下是半透明的），以显示您的实心 barTintColor

UINavigationBar.appearance().isTranslucent = false

Answer 2

在你的

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

放置这个：

  [[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init]
                                  forBarPosition:UIBarPositionAny
                                      barMetrics:UIBarMetricsDefault];

[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

斯威夫特：

放在下面的代码

UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarPosition: .Any, barMetrics: .Default)
UINavigationBar.appearance().shadowImage = UIImage()

下面的内部方法

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool

来源：https://stackoverflow.com/a/35151251/1585677