磨砂玻璃（iOS 7模糊）效果 [英] Frosted Glass (iOS 7 Blur) Effect
问题描述
我正在尝试在UIImageView中应用磨砂玻璃效果。
我尝试实现我发现的
更新1
因此，经过一些研究，我最终发现，与OS X版本的iOS相比，iOS的Core Image仍不完整。图书馆。因此，我在Google上进行了很多搜索，发现了两个解决方案，其中一个更简单，另一个更广泛和复杂的库。
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简单而简短的解决方案： https://github.com/esilverberg/ios-image-过滤器
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这个令人惊叹的编辑价值库，用于使用OpenGL处理图像和视频的库，GPUa 布拉德·拉森。它比Core Image更快，更高效。简介： http://www.sunsetlakesoftware.com/2012/02/ 12 / gpuimage-framework简介。 GitHub： GPUImage
例如，在几行中我可以得到想要的结果（其中originalImage是要应用效果的UIImage）：
GPUImageGaussianBlurFilter * blurFilter = [[GPUImageGaussianBlurFilter alloc] init];
blurFilter.blurSize = 2;
UIImage * blurImage = [blurFilter imageByFilteringImage：resizedImage];
UPDATE 2
在Apple发布iOS 7之后，一些开发人员发现了一种解决方法，可以与Apple在默认iOS应用程序中进行的操作相同，因为Apple没有为此提供API。 在我看来，最简单，更好的解决方案就是这个。为什么我认为这是最好的？因为即使它后面的某些视图发生了移动，模糊仍然可以在更新效果下很好地发挥作用，正如我们期望的那样。但是，请记住，它必须依靠iOS 7 SDK才能起作用，并且如果苹果更改了UIToolbar，可能会有风险。
UPDATE 3
Apple提到了，在WWDC 2013（会议226-在iOS上实现Engaging UI）上，他们将在UIImage上提供一个类别类，称为 UIImage + ImageEffects （我在Google上进行了查询， / iGriever / TWSReleaseNotesView / blob / master / TWSReleaseNotesView / rel = nofollow noreferrer>在此处找到，但可在开发人员门户-在搜索框中搜索UIImageEffects ）。使用此类别，您可以使用多种方法（浅色，深色，具有特定颜色等）在静态UIImage中应用模糊。另外，昨天我看到了此组件，并发现它非常有趣，因为您可以应用效果（
UPDATE 4
最后，在iOS 8上，Apple发布了可以轻松进行实时模糊处理的新类。使用 UIVisualEffect 和 UIVisualEffectView ，您可以快速向应用程序添加实时模糊。 这是Ryan Nystrom撰写的有关如何使用这些类（以及总体上是模糊的）：
I am trying to apply a frosted glass effect in a UIImageView.
I tried to implement what I've found in this question, but the result wasn't acceptable. I wanted something like this:
Also, we can see that iOS 7 uses this kind of effect in a lot of places. How can we reproduce it?
A good tutorial about CoreImage is here, showing how to apply filters and more:
http://www.raywenderlich.com/5689/beginning-core-image-in-ios-5
UPDATE 1
So after a little bit of research, I ended up discovering that the Core Image for the iOS is still incomplete, when comparing to the OS X version of the library. So I googled a lot, and I find two solutions, one of them more simple, and the other much wider and complex library.
The simple and short solution: https://github.com/esilverberg/ios-image-filters
The amazing and this edit worth, library for processing images and videos with OpenGL, GPUImage by Brad Larson. It is much faster and efficient than Core Image. Introduction: http://www.sunsetlakesoftware.com/2012/02/12/introducing-gpuimage-framework. GitHub: GPUImage
So, for example, in a few lines I can get the result I want (where originalImage is the UIImage to apply the effect):
GPUImageGaussianBlurFilter *blurFilter = [[GPUImageGaussianBlurFilter alloc] init];
blurFilter.blurSize = 2;
UIImage *blurImage = [blurFilter imageByFilteringImage:resizedImage];
UPDATE 2
After Apple announced iOS 7, some developers found a workaround to do the same that Apple did in the default iOS apps, as Apple didn't provide an API for that. The simplest and better solution, in my opinion, is this one. Why I think it's the best? Because even if some view behind it moves, the blur still works great with the updated effect, as we expect it should work. However, bear in mind that it depends on the iOS 7 SDK in order to work, and it can be risky if Apple changes UIToolbar.
UPDATE 3
Apple mentioned, at WWDC 2013 (Session 226 - Implementing Engaging UI on iOS) they would provide a category class on UIImage, called UIImage+ImageEffects (I googled it, and found here, but it's available in Developer Portal - search for UIImageEffects in the search box). With this category, you can apply the blur in a static UIImage, using several methods (light, dark, with a specific color, etc.). Also, yesterday I saw this component and found it pretty interesting, as you can apply the effect (based on the above mentioned category) in a frame.
UPDATE 4
Finally, on iOS 8, Apple released new classes that can do live blur easily. With UIVisualEffect and UIVisualEffectView, you can quickly add live blur to your apps. Here is a good tutorial from Ryan Nystrom on how to use those classes (and in blur in general):
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