在plist文件里添加
<key>UIUserInterfaceStyle</key>
<string>UIUserInterfaceStyleLight</string>
iOS12以后UIUserInterfaceStyle添加了dark模式，上传appstore提交审核，报错App Store Connect Operation Error ERROR ITMS-90785；
具体报错信息：
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：
<key>UIUserInterfaceStyle</key>
<string>Light</string>
