Status Bar Dark Content Not Working On iOS 13 Dark Mode

Status Bar Dark Content Not Working On iOS 13 Dark Mode

> I solved the problem.
> 
> Apple has added a new constant to the status bar with the latest update, so dark-content doesn't work. (in dark-mode)
> 
> https://developer.apple.com/documentation/uikit/uistatusbarstyle?language=objc
> 
> New Constant: UIStatusBarStyleDarkContent - A dark status bar, intended for use on light backgrounds.
> 
> * Open XCode
> * Search: RCTStatusBarManager.m
> * Pods/Development Pods/React-Core/Modules/RCTStatusBarManager.m (xCode)
> * Other Editor
>   node_modules/react-native/React/RCTStatusBarManager.m
> 
> ```
> RCT_ENUM_CONVERTER(UIStatusBarStyle, (@{
>   @"default": @(UIStatusBarStyleDefault),
>   @"light-content": @(UIStatusBarStyleLightContent),
>   @"dark-content": @(UIStatusBarStyleDefault),
> }), UIStatusBarStyleDefault, integerValue);
> ```
> 
> To Change:
> 
> ```
> #pragma clang diagnostic push
> #pragma clang diagnostic ignored "-Wunguarded-availability"
> 
> RCT_ENUM_CONVERTER(UIStatusBarStyle, (@{
>   @"default": @(UIStatusBarStyleDefault),
>   @"light-content": @(UIStatusBarStyleLightContent),
>   @"dark-content": (@available(iOS 13.0, *)) ? @(UIStatusBarStyleDarkContent) : @(UIStatusBarStyleDefault),
> }), UIStatusBarStyleDefault, integerValue);
> 
> #pragma clang diagnostic pop
> ```
https://github.com/facebook/react-native/issues/26619#issuecomment-536191518


> I tried both the self.window and rootView overrides and neither worked for me. I finally discovered a workaround that works in 13.1.2.
> Add this to your plist file:
> 
> ```
> <key>UIUserInterfaceStyle</key>
> <string>Light</string>
> ```

https://github.com/facebook/react-native/issues/26299#issuecomment-540261084