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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| // | ||
| // UIView+Blur.swift | ||
| // Blur | ||
| // | ||
| // Created by Roman Sorochak <[email protected]> on 6/27/17. | ||
| // Copyright © 2017 MagicLab. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| extension UIView { | ||
|
|
||
| private struct AssociatedKeys { | ||
| static var descriptiveName = "AssociatedKeys.DescriptiveName.blurView" | ||
| } | ||
|
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| private (set) var blurView: BlurView { | ||
| get { | ||
| if let blurView = objc_getAssociatedObject( | ||
| self, | ||
| &AssociatedKeys.descriptiveName | ||
| ) as? BlurView { | ||
| return blurView | ||
| } | ||
| self.blurView = BlurView(to: self) | ||
| return self.blurView | ||
| } | ||
| set(blurView) { | ||
| objc_setAssociatedObject( | ||
| self, | ||
| &AssociatedKeys.descriptiveName, | ||
| blurView, | ||
| .OBJC_ASSOCIATION_RETAIN_NONATOMIC | ||
| ) | ||
| } | ||
| } | ||
|
|
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| class BlurView { | ||
|
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| private var superview: UIView | ||
| private var blur: UIVisualEffectView? | ||
| private var editing: Bool = false | ||
| private (set) var blurContentView: UIView? | ||
| private (set) var vibrancyContentView: UIView? | ||
|
|
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| var animationDuration: TimeInterval = 0.1 | ||
|
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| /** | ||
| * Blur style. After it is changed all subviews on | ||
| * blurContentView & vibrancyContentView will be deleted. | ||
| */ | ||
| var style: UIBlurEffectStyle = .light { | ||
| didSet { | ||
| guard oldValue != style, | ||
| !editing else { return } | ||
| applyBlurEffect() | ||
| } | ||
| } | ||
| /** | ||
| * Alpha component of view. It can be changed freely. | ||
| */ | ||
| var alpha: CGFloat = 0 { | ||
| didSet { | ||
| guard !editing else { return } | ||
| if blur == nil { | ||
| applyBlurEffect() | ||
| } | ||
| let alpha = self.alpha | ||
| UIView.animate(withDuration: animationDuration) { | ||
| self.blur?.alpha = alpha | ||
| } | ||
| } | ||
| } | ||
|
|
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| init(to view: UIView) { | ||
| self.superview = view | ||
| } | ||
|
|
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| func setup(style: UIBlurEffectStyle, alpha: CGFloat) -> Self { | ||
| self.editing = true | ||
|
|
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| self.style = style | ||
| self.alpha = alpha | ||
|
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| self.editing = false | ||
|
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| return self | ||
| } | ||
|
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| func enable(isHidden: Bool = false) { | ||
| if blur == nil { | ||
| applyBlurEffect() | ||
| } | ||
|
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| self.blur?.isHidden = isHidden | ||
| } | ||
|
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| private func applyBlurEffect() { | ||
| blur?.removeFromSuperview() | ||
|
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| applyBlurEffect( | ||
| style: style, | ||
| blurAlpha: alpha | ||
| ) | ||
| } | ||
|
|
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| private func applyBlurEffect(style: UIBlurEffectStyle, | ||
| blurAlpha: CGFloat) { | ||
| superview.backgroundColor = UIColor.clear | ||
|
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| let blurEffect = UIBlurEffect(style: style) | ||
| let blurEffectView = UIVisualEffectView(effect: blurEffect) | ||
|
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| let vibrancyEffect = UIVibrancyEffect(blurEffect: blurEffect) | ||
| let vibrancyView = UIVisualEffectView(effect: vibrancyEffect) | ||
| blurEffectView.contentView.addSubview(vibrancyView) | ||
|
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| blurEffectView.alpha = blurAlpha | ||
|
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| superview.insertSubview(blurEffectView, at: 0) | ||
|
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| blurEffectView.addAlignedConstrains() | ||
| vibrancyView.addAlignedConstrains() | ||
|
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| self.blur = blurEffectView | ||
| self.blurContentView = blurEffectView.contentView | ||
| self.vibrancyContentView = vibrancyView.contentView | ||
| } | ||
| } | ||
|
|
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| private func addAlignedConstrains() { | ||
| translatesAutoresizingMaskIntoConstraints = false | ||
| addAlignConstraintToSuperview(attribute: NSLayoutAttribute.top) | ||
| addAlignConstraintToSuperview(attribute: NSLayoutAttribute.leading) | ||
| addAlignConstraintToSuperview(attribute: NSLayoutAttribute.trailing) | ||
| addAlignConstraintToSuperview(attribute: NSLayoutAttribute.bottom) | ||
| } | ||
|
|
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| private func addAlignConstraintToSuperview(attribute: NSLayoutAttribute) { | ||
| superview?.addConstraint( | ||
| NSLayoutConstraint( | ||
| item: self, | ||
| attribute: attribute, | ||
| relatedBy: NSLayoutRelation.equal, | ||
| toItem: superview, | ||
| attribute: attribute, | ||
| multiplier: 1, | ||
| constant: 0 | ||
| ) | ||
| ) | ||
| } | ||
| } |
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