+ [UIColor whiteColor]为什么不等于另一种白色？

问题描述

这真的很奇怪。将 + [UIColor redColor] 与我创建的红色进行比较，得出的结果相同，但是将 + [UIColor whiteColor] 进行比较

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.");

在扩展 UIColor 的同时

有人可以帮我一下吗？

推荐答案

UIColor 并不总是基于RGBA值。

"UIColor" isn't always based on RGBA values.

UIColor处理不同的颜色空间，例如CMYK颜色；对于白色，您可以通过。

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:].

我怀疑 [UIColor whiteColor] 在您的情况下等于 [UIColor colorWithWhite ：1.0 alpha：1.0] 。

I suspect [UIColor whiteColor] in your case is going to equal [UIColor colorWithWhite:1.0 alpha:1.0].

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