+ (NSDictionary<id, id> *)llDarkTheme {
    return @{
             UIColor.whiteColor : kColorRGB(27, 27, 27),
             kColorRGB(240, 238, 245) : kColorRGB(39, 39, 39),
             [UIColor colorWithRed:14.0 / 255.0 green:255.0 / 255.0 blue:0.0 alpha:1.0] : [UIColor colorWithRed:0.0 green:14.0 / 255.0 blue:255.0 / 255.0 alpha:1.0],
             @"background_light" : @"background_dark",
             @"~/path/background_light.png" : @"~/path/background_dark.png",
    };
}

// UIColor
UIColor.redColor; // Previous usage
UIColor.redColor.themeColor(nil); // Current usage

// CGColor
UIColor.redColor.CGColor; // Previous usage
UIColor.redColor.themeCGColor(nil); // Current usage

// UIImage
[UIImage imageNamed:@"lightImageName"]; // Previous usage
[UIImage themeImage:@"lightImageName"]; // Current usage

1. If the parameter in themeColor() is a specific Color object, the dark theme will refresh with the specified Color object.
If it is nil, it will return to the dark color refresh configured in llDarkTheme,
If llDarkTheme is not configured, it will return the color under the light theme.

2. The function of the themeCGColor() parameter is the same as the function of the themeColor() parameter.

3. themeImage() has 2 parameters, the parameter can be the image name or the image address,
The first parameter represents the picture used under the light theme (required),
The second parameter represents the picture used under the dark theme (can be empty),
If the second parameter is empty, the treatment is the same as if themeColor() is empty.

4. appearanceBindUpdater，All objects inherited from UIView have this property,
It will be called when the object needs to be refreshed, and you can implement your own refresh logic here.
It is only called when a refresh is needed, and the theme change does not necessarily require refreshing the UI.

5. userInterfaceStyle，Similar to the overrideUserInterfaceStyle method of iOS13 system,
But the function is more powerful than overrideUserInterfaceStyle,
It supports all objects, such as CALayer.
It supports system usage below iOS13.

6. themeDidChange，All objects have this property, which is the same as ThemeDidChangeNotification.
themeDidChange will be released when the object is released,
Can be used in multiple places, the callback order is not guaranteed,
Unlike appearanceBindUpdater, themeDidChange is called whenever the theme changes.

7. systemThemeDidChange，All objects have this property, which is the same as SystemThemeDidChangeNotification.
The release timing is the same as themeDidChange,
Can be used in multiple places, the callback order is not guaranteed,
As long as the system theme changes, systemThemeDidChange will be called.

8. darkStyle，All UIImageView objects have this method to adapt to image objects without dark images, such as web images.
DarkStyle has 3 parameters. The first parameter determines how to adapt to the dark theme. There are currently two types: LLDarkStyleSaturation and LLDarkStyleMask.
LLDarkStyleMask uses mask adaptation, and LLDarkStyleSaturation adapts by reducing the saturation of the original image.
The second parameter determines the transparency/saturation value of the mask. For specific usage, please refer to the source code comments.
The third parameter can be nil. When using LLDarkStyleSaturation, you need to pass a unique string as an identifier, usually the url of the image.
Sample code:
UIImageView *imageView = [[UIImageView alloc] init];
NSString *url = @"Picture URL";
imageView.darkStyle(LLDarkStyleSaturation, 0.2, url);
// imageView.darkStyle(LLDarkStyleMask, 0.5, nil);

9. updateDarkTheme:，If you need to modify the dark theme configuration information at runtime, or need to obtain dark theme configuration information from the Internet, you can use updateDarkTheme: to achieve the goal.
Please ensure that the dark theme information is configured before the first UI object is loaded, otherwise it will be invalid.
Sample code:
NSDictionary *darkTheme = @{
    UIColor.whiteColor : kColorRGB(27, 27, 27),
    kColorRGB(240, 238, 245) : kColorRGB(39, 39, 39),
    [UIColor colorWithRed:14.0 / 255.0 green:255.0 / 255.0 blue:0.0 alpha:1.0] : [UIColor colorWithRed:0.0 green:14.0 / 255.0 blue:255.0 /  255.0 alpha:1.0],
    @"background_light" : @"background_dark",
    @"~/path/background_light.png" : @"~/path/background_dark.png",
};
[LLDarkSource updateDarkTheme:darkTheme];

10. thirdControlClassName，If you need to support the refresh method of the third-party control, you can implement the refresh logic separately in appearanceBindUpdater, or you can implement the refresh logic according to the following methods, and the following methods are more recommended.
First, you need to implement the thirdControlClassName class method and return an array containing the class name string of the third party control.
Then implement the refresh+class name string object method, and implement the refresh logic of the third-party control in the method. You can refer to the YYLabel refresh logic that has been implemented in the LLThird.m file.
For details, you can download the project and view the Demo to understand the specific implementation.

11. If you need to support the adaptation of the dark startup image in iOS13 or lower, please name the dark image according to the specified rules and place it in any directory of the project.
Naming rule: launchImage_<screen width>_<screen height>.
For example: launchImage_414_736, this dark launch image will appear after switching to dark mode on models with a screen width of 414×736 and systems below iOS13.
If you want to adapt the horizontal image, you only need to exchange the width and height positions, for example: launchImage_736_414.
The specific effect can be viewed by running Demo on the system below iOS13 and switching to dark mode.
For specific naming, please refer to the image naming method under the LaunchImage folder in the Demo project. It contains the dark launch image of all models below iOS 13 (including horizontal screen, excluding models before iPhone 6).

12. LLLaunchScreen provides some class methods, reasonable use of these class methods can perfectly replace any startup image of APP, including "dark vertical launch Image", "dark horizontal launch Image", "light vertical launch Image", "Light horizontal launch Image".
Please refer to the LLLaunchScreen.h file for specific methods.
For usage method, please refer to Demo.