Click on the Tint field in the interface builder (your color).
Click the RGB sliders. They will be in decimal format.
Convert each number to hexadecimal with Google.
For example, with the query: 255 in hexadecimal format.
The last two letters in this case FF is the color.
Your html color:
#RRGGBB
Where R is for red, G is for green and B is for blue.
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