Why does +[UIColor whiteColor] not equal another white?
cocoa-touch, equality, ios, uicolor, uikit
Solution
"`UIColor`" isn't always based on RGBA values.
There are different color spaces that UIColor works with, such as CMYK colors and, in the case of white color, you can get a white color via `[UIColor colorWithWhite:alpha:]`.
I suspect `[UIColor whiteColor]` in your case is going to equal `[UIColor colorWithWhite:1.0 alpha:1.0]`.
Problem
This is something really strange. Comparing `+[UIColor redColor]` with a red I create myself gives an equal result, but comparing `+[UIColor whiteColor]` to another white does not. ``` // This test passes. XCTAssertEqualObjects([UIColor redColor], [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0], @"Red should equal red."); // While this test fails! XCTAssertEqualObjects([UIColor whiteColor], [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0], @"White should equal white."); ``` While I'm extending `UIColor` with some useful additions, this fact can be really annoying. Can somebody shed a light on this for me?