如何使用 UIVisualEffectView 来模糊图像? [英] How to use UIVisualEffectView to Blur Image?

问题描述

有人可以举一个将模糊应用于图像的小例子吗?我一直在尝试弄清楚代码有一段时间了:(在 obj c 上仍然是新的！

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 提供了对复杂的简单抽象视觉效果.根据所需的效果，结果可能影响分层在视图后面的内容或添加到视图的内容内容视图.

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 应用到现有视图以应用模糊或现有视图的活力效果.添加后UIVisualEffectView 到视图层次结构，将任何子视图添加到UIVisualEffectView 的 contentView.不要直接添加子视图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.这是Objective-C中的一个例子:

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];

和斯威夫特:

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

visualEffectView.frame = imageView.bounds

imageView.addSubview(visualEffectView)

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