如何使用UIVisualEffectView？ [英] How to use UIVisualEffectView?

问题描述

有人可以给出一个将模糊应用于图像的小例子吗？我一直试图弄清楚代码一段时间了:(在obj c仍然是新的！

Could someone give a small example of applying the blur to an image? I've been trying to figure out the code for a while now :( still new at obj c!

UIVisualEffectView 提供了对复杂的
视觉效果的简单抽象。根据所需的效果，结果可能
影响视图后面的内容或添加到视图$ b $的内容b contentView。

The UIVisualEffectView provides a simple abstraction over complex visual effects. Depending on the desired effect, the results may affect content layered behind the view or content added to the view’s contentView.

将 UIVisualEffectView 应用于现有视图以应用模糊或
活力效果退出视图。将
UIVisualEffectView添加到视图层次结构后，将任何子视图添加到 UIVisualEffectView 的
contentView。不要直接添加子视图到
UIVisualEffectView 本身。

Apply a UIVisualEffectView to an existing view to apply a blur or vibrancy effect to the exiting view. After you add the UIVisualEffectView to the view hierarchy, add any subviews to the contentView of the UIVisualEffectView. Do not add subviews directly to the UIVisualEffectView itself.

https://developer.apple.com/documentation/uikit/uivisualeffectview# // apple_ref / occ / instp / UIVisualEffectView / contentView

推荐答案

只需将此模糊视图放在imageView上即可。以下是Objective-C中的示例：

Just put this blur view on the imageView. Here is an example in Objective-C:

UIVisualEffect *blurEffect;
blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];

UIVisualEffectView *visualEffectView;
visualEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];

visualEffectView.frame = imageView.bounds;
[imageView addSubview:visualEffectView];

和Swift：

var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light))    

visualEffectView.frame = imageView.bounds

imageView.addSubview(visualEffectView)

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