As we all know YYLabel is no longer update. If your project is using YYLabel and has to adapt iOS13 DarkMode, it's a hard thing to do now.

This repo is using FluentDarkModeKit for it's core code, all you need to do is just initialize YYLabel+DarkModeKit .

You can initialize in Appdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
  [YYLabel config];
 .... 
}

1. If you are using YYTextLayout, just config Dynamic Color in NSMutableAttributedString

    NSMutableAttributedString *demoStr = [[NSMutableAttributedString alloc] initWithString:@"lalala"];
    [demoStr addAttribute:NSForegroundColorAttributeName value:[UIColor dm_colorWithLightColor:[UIColor redColor] darkColor:[UIColor blueColor]] range:NSMakeRange(0, demoStr.length)];
    YYTextContainer *container = [YYTextContainer containerWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width, CGFLOAT_MAX)];
    YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:demoStr];

2. If you are using NSMutableAttributedString , you can code like above tips too

I'm using runtime swizzle method to monitor the textlayout and attributestring . When it is setted , find if there is Dynamic Color in AttributeString and mark it.

Adopted FluentDarkModeKit Delegate . When DarkMode change , reset AttributeString's NSForegroundColorAttributeName if it has Dynamic Color Mark

As we know , iOS CGColor is not support Darkmode . If you set AttributeString like this:

attributeString.color = [xxxx]
//NSAttributeString+YYText.m

it won't work because it using CGColor

If you Modify source code , delete CGColor in .m , it can work Again!