UILabel文本颜色透明度和适当的图层阴影？ [英] UILabel text color transparency with layer shadows in place?

问题描述

我有一个 UILabel ，我正在尝试向其应用半透明渐变作为颜色。例如，在我的 UILabel 子类中，我尝试通过以下方式设置渐变颜色：

I have a UILabel to which I am attempting to apply a semi-transparent gradient as a color onto. For example, in my UILabel subclass I'm trying to set the gradient color this way:

self.textColor = [UIColor colorWithPatternImage:someTransparentGradient];

尽管搞砸了，但我发现 UILabel 当图层阴影到位时，似乎无法透明地绘制code>。我试图将文本颜色设置为清除：

While messing around with this, however, I discovered that a UILabel doesn't seem to be able to draw with transparency when layer shadows are in place. I attempted to set the text color to clear:

self.textColor = [UIColor clearColor];

但文本最终变成白色。

but the text ended up being white. Ideas?

如果您将文字颜色设置为清除，然后将层阴影应用于文本视图，则可以自己复制问题。

推荐答案

我通常不接受自己的答案，但是在这种情况下，我必须接受。这似乎是一个错误。每当将图层阴影应用于 UILabel 时，就不再支持文本透明性。我会提出雷达。

I don't normally accept my own answers, but in this case I must. This seems to be a bug. Whenever layer shadows are applied to a UILabel, text transparency is no longer supported. I will file a radar.

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