cNoob cNoob - 5 months ago 32
iOS Question

How to use UIVisualEffectView?

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!


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.

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/library/prerelease/ios/documentation/UIKit/Reference/UIVisualEffectView/index.html#//apple_ref/occ/instp/UIVisualEffectView/contentView

Answer

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];

and Swift:

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

visualEffectView.frame = imageView.bounds

imageView.addSubview(visualEffectView)
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