网上google搜到的, 关于"不使用暗黑模式"的解决办法都是：这是写法确实是有效的，但是上传appstore提交审核，会报错App Store Connect Operation Error ERROR ITMS-90785：
App Store Connect Operation Error ERROR ITMS-90785: “UIUserInterfaceStyle can’t be ‘UIUserInterfaceStyleLight’. It can only be ‘Light’, ‘Dark’, or ‘Automatic’. Learn more (https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW44).”
从字面上意思是UIUserInterfaceStyle不能为UIUserInterfaceStyleLight模式，应该为Light或者Dark，或者Automatic模式
解决办法： 值改为"Light"、“Dark”、"Automatic"即可：