为什么我不能为UINavigationBar设置自定义色调? [英] Why can't I set a custom color-tint for the UINavigationBar?

问题描述

我想更改导航栏上的颜色，并且文档指出不要尝试更改'alpha'值.那么，如果所有构造函数都提供一个alpha值，我该如何设置不是SDK定义值的颜色(例如[UIColor redColor]，brownColor等)?我尝试获取当前的alpha值，但这没有帮助.当我使用自定义颜色时，它会使导航栏看起来像X射线(粗cra的黑底白字).

I want to change the color on the navigation bar and the documentation states not to attempt to change the 'alpha' value. So, how can I set a color that is not the SDK defined values (e.g., [UIColor redColor], brownColor, etc.) if all the constructors provide an alpha value? I tried getting the current alpha value but that did not help. When I use a custom color, it causes the navigation bar to look like an x-ray (a scraggy, black-on-white).

[self.navigationController.navigationBar setTintColor: [UIColor brownColor]];

推荐答案

我可以成为一个白痴……几个月了，我假设这些值的范围是0..255(即HTML颜色值)，但是它们在[0.0 .. 1.0]范围内.现在，我设置了0..255的值并将其标准化为0..1，它可以按预期工作.我写了一个简单的彩色滑块应用程序，当我调试它时，就是我意识到自己的错误.

I can be such an idiot ... for months now, I assumed the values ranged from 0..255 (i.e., HTML color values), but they are in the range [0.0 .. 1.0]. Now that I set my 0..255 value and normalize it to 0..1 it works as expected. I wrote a simple color-slider application and when I was debugging it, is when I realized my mistake.

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