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UIVisualEffectView subclass that allows to customise effect intensity
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import UIKit | |
final class CustomIntensityVisualEffectView: UIVisualEffectView { | |
/// Create visual effect view with given effect and its intensity | |
/// | |
/// - Parameters: | |
/// - effect: visual effect, eg UIBlurEffect(style: .dark) | |
/// - intensity: custom intensity from 0.0 (no effect) to 1.0 (full effect) using linear scale | |
init(effect: UIVisualEffect, intensity: CGFloat) { | |
theEffect = effect | |
customIntensity = intensity | |
super.init(effect: nil) | |
} | |
required init?(coder aDecoder: NSCoder) { nil } | |
deinit { | |
animator?.stopAnimation(true) | |
} | |
override func draw(_ rect: CGRect) { | |
super.draw(rect) | |
effect = nil | |
animator?.stopAnimation(true) | |
animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [unowned self] in | |
self.effect = theEffect | |
} | |
animator?.fractionComplete = customIntensity | |
} | |
private let theEffect: UIVisualEffect | |
private let customIntensity: CGFloat | |
private var animator: UIViewPropertyAnimator? | |
} |
override func draw(_ rect: CGRect) {
super.draw(rect)
effect = nil
animator?.stopAnimation(true)
animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [unowned self] in
self.effect = theEffect
}
animator?.fractionComplete = customIntensity
DispatchQueue.main.async { [weak self] in
self?.animator.stopAnimation(true)
self?.animator.finishAnimation(at: .current)
}
}
for cells and view states, you can finish animation
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Just as a heads up, this code has trouble with UITests.
Setting
fractionComplete
on an animator and not stopping the animation essentially indicates to the test runner that animations haven't settled, which results in tests hanging for long periods of time, showing the following message in the console:Wait for <myAppIdentifier> to idle
From the docs on
fractionComplete
:There's a bit more info on this here that I found helpful in solving this code's behavior with UITests:
https://diggingdeveloper.blog/2022/01/21/xcode-ui-tests-infinite-wait-for-app-to-idle/
As a workaround, you could choose to disable this code with a custom environment variable like
isUITesting
.