透明UILabel textColor on superview.superview（sort of） [英] Transparent UILabel textColor on superview.superview (sort of)

问题描述

我想实现与iOS 7的新远程更新为 UILabel 相同的效果。

I would like to achieve the same effect as in the new iTunes remote update for iOS 7 for my UILabel.

如果您查看此屏幕：

（右侧的一个），您会注意到 UILabel 文本颜色是没有黑色面具的背景模糊相册封面。

(The one on the right) you'll notice that the UILabel text color is the background blurred album cover without the black mask.

目前我有透明 UILabel textColor（ http://cl.ly/SInK ），我的代码类似于 https://github.com/robinsenior/RSMaskedLabel

At the moment I have transparent UILabel textColor (http://cl.ly/SInK), my code is similar to https://github.com/robinsenior/RSMaskedLabel

我的第一个假设是拥有像

My first assumption is to have a view hierarchy like that

UIImageView (Light blurred image)
    |
UIImageView/UIView (Dark blurred image or just a dark mask for the superview)
    |
UILabel (And all my other view). 

我想让 UILabel 透明文本颜色在第一个UIImageView，忽略第二个/ Mask）。

I would like the UILabel to have a transparent text color on the first UIImageView, ignoring the second one/Mask).

我无法围绕解决方案来实现这种效果。

I can't wrap my head around a solution to achieve this effect.

推荐答案

由于iOS 8苹果提供了一个新类UIVibrancyEffect，可以添加到UIVisualEffectView。这与UIBlurEffect结合可以实现与我上面的截图完全相同的结果。

Since iOS 8 Apple offer a new class, UIVibrancyEffect, which can be added to a UIVisualEffectView. This combined with a UIBlurEffect can achieve the exact same result as my screenshot above.

资料来源： https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UIVibrancyEffect/index.html

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