无法更改导航栏的不透明度 [英] Unable to change navigation bar opacity

问题描述

我正在尝试通过以下方式设置应用样式，但是我无法使导航栏达到这种不透明级别

I am trying to style my app in the following way, however i am unable to get my navigation bar to reach this level of opacity

我使用以下代码来设置导航栏的样式:

I use the following code to style the navigation bar:

unc application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    UINavigationBar.appearance().barTintColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.1)
    UINavigationBar.appearance().tintColor = UIColor.whiteColor()
    UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whiteColor()]
}

即使将alpha设置为0.1，我仍然只能得到以下结果:

Even with the alpha set to 0.1, i still only get the following result:

是否可以实现如此低的不透明度?

Is it possible to achieve such a low opacity?

推荐答案

这是我找到的最好方法.您可以将其粘贴到appDelegate的didFinishLaunchingWithOptions方法中:

This is the best way that I've found. You can just paste it into your appDelegate's didFinishLaunchingWithOptions method:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    // Sets background to a blank/empty image
    UINavigationBar.appearance().setBackgroundImage(UIImage(), forBarMetrics: .Default)
    // Sets shadow (line below the bar) to a blank image
    UINavigationBar.appearance().shadowImage = UIImage()
    // Sets the translucent background color
    UINavigationBar.appearance().backgroundColor = UIColor(red: 0.0, green: 0.0, blue: 0.0, alpha: 0.0)
    // Set translucent. (Default value is already true, so this can be removed if desired.)
    UINavigationBar.appearance().translucent = true

    return true
}

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