标准iOS 7模糊实现 [英] Standard iOS 7 blur implementation

问题描述

我已经阅读了几十个关于在iOS早期版本中模仿iOS 7模糊效果的问题。但是这里出现的基本问题是iOS 7的 UIKit 真的有一个很好的和方便的方法来使任何 UIView 模糊？这对我来说似乎很合理。任何帮助感谢。

I have read dozens of questions about mimicking iOS 7 blur effect in earlier versions of iOS. But the fundamental question that arises here is does iOS 7's UIKit really have a nice and convenient way to make any UIView blurred? That seems quite logical to me. Any help appreciated.

推荐答案

UPDATE

从iOS 8.0 不是 iOS 7），UIKit提供 UIVisualEffectView 和 UIBlurEffect 。您可以观看 WWDC 2014会话419iOS应用的高级图形和动画 （或仅下载幻灯片）

UPDATE

As of iOS 8.0 (not iOS 7), UIKit provides UIVisualEffectView and UIBlurEffect. You can watch WWDC 2014 Session 419 "Advanced Graphics and Animations for iOS Apps" (or just download the slides) for an introduction to these classes.

不，它没有。苹果没有暴露一个接口这样做方便。例如，如果您通读此次讨论，Rincewind的回复应该明确表示，苹果不为此提供公共API，并且他们使用的私有API有严格的限制，可能会改变。

No, it doesn't. Apple has not exposed an interface for doing this conveniently. For example, if you read through this discussion, Rincewind's responses should make it clear that Apple doesn't provide a public API for this, and that the private APIs they use have serious limits and are likely to change.

您必须实现模糊效果自己。您可能想要使用新的 - [UIView drawViewHierarchyInRect：afterScreenUpdates：] 方法捕获背景视图的外观，然后应用 CIFilter 来执行模糊处理。

You must implement the blur effect yourself. You'll probably want to use the new -[UIView drawViewHierarchyInRect:afterScreenUpdates:] method to capture the appearance of the background view, and then apply a CIFilter to it to perform the blur.

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