Theme Mode
Global IM UIKit supports three global themes: light, dark, and system default. You can set the theme mode using the themeType property in RCIMKitConfig:
/// Theme type
typedef NS_ENUM(NSUInteger, RCThemeType) {
RCThemeTypeAny = 0, /// Follow system
RCThemeTypeLight = 1, /// Light
RCThemeTypeDark = 2, /// Dark
};
The default theme mode for Global IM UIKit is RCThemeTypeAny (follow system).
Light Theme
Set the global theme to light mode.
[RCIMKitConfig shared].themeType = RCThemeTypeLight;

Dark Theme
Set the global theme to dark mode.
[RCIMKitConfig shared].themeType = RCThemeTypeDark;
