-
-
Save darrarski/29a2a4515508e385c90b3ffe6f975df7 to your computer and use it in GitHub Desktop.
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? | |
} |
@orakay thanks for reporting. I have updated the gist, and it should now work correctly on iOS 14.2. I am not sure about the performance, though, as it recreates the
UIViewPropertyAnimator
every time the view is drawn. However, I used this approach in SwiftUI and didn't notice any performance issues.
Thanks for such a quick solution. It works without any performance issue.
cool
great
ios 14.5 from background - effect reset
In order to solve the foreground/background issues try setting animator?.pausesOnCompletion = true
inside func draw(_ rect: CGRect)
after animator = UIViewPropertyAnimator(.....
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
:
Changing the value of this property on an inactive animator moves it to the active state.
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
.
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
@orakay thanks for reporting. I have updated the gist, and it should now work correctly on iOS 14.2. I am not sure about the performance, though, as it recreates the
UIViewPropertyAnimator
every time the view is drawn. However, I used this approach in SwiftUI and didn't notice any performance issues.