覆盖变量后，状态栏样式是否会发生变化？

Question

我将以下代码添加到我的UITableViewController类中：

override var preferredStatusBarStyle: UIStatusBarStyle {
    return .lightContent
}

但是在我重新运行应用程序后，没有任何变化，状态栏仍然是黑暗的：

输出：

ProjectNavigator：

界面生成器：

RestaurantTableViewController中的代码：

我希望它是白色，我应该添加什么？

Answer 1

你应该致电

self.setNeedsStatusBarAppearanceUpdate()

然后状态栏样式将更新

另外，在info.plist中你应该设置

<key>UIViewControllerBasedStatusBarAppearance</key>
<true/>

编辑：

我认为你的UITableViewController不是rootViewController。如果上述解决方案无效，请尝试为rootViewController设置preferredStatusBarStyle。 UINavigationController看起来像是基于屏幕截图的根控制器

Answer 2

我宁愿在AppDelegate中这样做（application.statusBarStyle = .lightContent） - ：

Error: spawn EACCES
at exports._errnoException (util.js:1026:11)
at ChildProcess.spawn (internal/child_process.js:313:11)
at exports.spawn (child_process.js:392:9)
at /Users/myusername/.atom/packages/atom-beautify/src/beautifiers/beautifier.coffee:349:13
at Promise._execute (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/debuggability.js:300:9)
at Promise._resolveFromExecutor (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:483:18)
at new Promise (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:79:10)
at PHPCSFixer.module.exports.Beautifier.spawn (/Users/myusername/.atom/packages/atom-beautify/src/beautifiers/beautifier.coffee:346:16)
at /Users/myusername/.atom/packages/atom-beautify/src/beautifiers/beautifier.coffee:308:10
at tryCatcher (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:512:31)
at Promise._settlePromise (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:569:18)
at Promise._settlePromise0 (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:614:10)
at Promise._settlePromises (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:693:18)
at Promise._fulfill (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:638:18)
at PromiseArray._resolve (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise_array.js:126:19)
at PromiseArray._promiseFulfilled (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise_array.js:144:14)
at Promise._settlePromise (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:574:26)
at Promise._settlePromise0 (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:614:10)
at Promise._settlePromises (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/promise.js:693:18)
at Async._drainQueue (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/async.js:133:16)
at Async._drainQueues (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/async.js:143:10)
at Async.drainQueues (/Users/myusername/.atom/packages/atom-beautify/node_modules/bluebird/js/release/async.js:17:14)

Answer 3

如果您还想知道如何为每个子控制器设置状态栏样式：

1. 确保在 info.plist 中设置<key>UIViewControllerBasedStatusBarAppearance</key> <true/>。

2. 确保您已经为根控制器（入口点控制器）编写了一个控制器类，我在编写问题帖子时没有创建一个控制器类，正如您在图片中看到的那样我的问题。

3. 在根控制器类（刚刚创建）中添加以下内容：

   override var preferredStatusBarStyle: UIStatusBarStyle {
       return .lightContent
   }
   
   override var childViewControllerForStatusBarStyle: UIViewController? {
       return self.topViewController
   }
   

   我选择.lightContent作为我需要的内容，但您可以根据需要将其更改为.default。

4. 现在对于每个特定的视图控制器类，在我的例子中是 RestaurantTableViewController 和 RestaurantDetailViewController ，你可以添加：

   override var preferredStatusBarStyle: UIStatusBarStyle {
       return .theStyleYouLike
   }
   

   .theStyleYouLike可以是.default或.lightContent。