禁用的 UIButton 不褪色或变灰

问题描述

在我的 iPhone 应用程序中，我有一个在 Interface Builder 中创建的 UIButton.我可以像这样在我的代码中成功启用和禁用它...

In my iPhone app, I have a UIButton which I have created in Interface Builder. I can successfully enable and disable it like this in my code ...

sendButton.enabled = YES;

或

sendButton.enabled = NO;

但是，按钮的视觉外观始终相同！它不会褪色或变灰.如果我尝试单击它，它会按预期启用或禁用.我错过了什么吗?它不应该看起来褪色或变灰吗?

However, the visual look of the button is always the same! It is not faded or grey. If I attempt to click it though, it is enabled or disabled as expected. Am I missing something? Shouldn't it look faded or grey?

推荐答案

可以使用如下代码:

sendButton.enabled = YES;
sendButton.alpha = 1.0;

or

sendButton.enabled = NO;
sendButton.alpha = 0.5;

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