How to convert UIColor value to a named color string?

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The CIColor class contains color values and the color space for which the color values are valid.

https://developer.apple.com/documentation/coreimage/cicolor

// UIColor to NSString
CGColorRef colorRef = [UIColor grayColor].CGColor;  
NSString *colorString = [CIColor colorWithCGColor:colorRef].stringRepresentation;

// NSString to UIColor 
CIColor *coreColor = [CIColor colorWithString:@"0.5 0.5 0.5 1.0"];  
UIColor *color = [UIColor colorWithCIColor:coreColor];

—————–Warning———–

If You Want Support All Devices The Way Mentioned Above to Convert NSString to UIColor Will Not Work On All Devices.

stringRepresentation

Returns a formatted string that specifies the components of the color.

The string representation always has four components—red, green, blue, and alpha.

https://developer.apple.com/documentation/coreimage/cicolor/1437910-stringrepresentation

colorWithString:

Creates a color object using the RGBA color component values specified by a string.

https://developer.apple.com/documentation/coreimage/cicolor/1438059-colorwithstring

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