mastodon-ios/Mastodon/Scene/Share/View/Control/StripProgressView.swift

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Swift
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//
// StripProgressView.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-3-3.
//
import os.log
import UIKit
import Combine
private final class StripProgressLayer: CALayer {
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static let progressAnimationKey = "progressAnimationKey"
static let progressKey = "progress"
var tintColor: UIColor = .black
@NSManaged var progress: CGFloat
override class func needsDisplay(forKey key: String) -> Bool {
switch key {
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case StripProgressLayer.progressKey:
return true
default:
return super.needsDisplay(forKey: key)
}
}
override func display() {
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let progress: CGFloat = {
guard animation(forKey: StripProgressLayer.progressAnimationKey) != nil else {
return self.progress
}
return presentation()?.progress ?? self.progress
}()
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// os_log(.info, log: .debug, "%{public}s[%{public}ld], %{public}s: progress: %.2f", ((#file as NSString).lastPathComponent), #line, #function, progress)
UIGraphicsBeginImageContextWithOptions(bounds.size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else {
assertionFailure()
return
}
context.clear(bounds)
var rect = bounds
let newWidth = CGFloat(progress) * rect.width
let widthChanged = rect.width - newWidth
rect.size.width = newWidth
switch UIApplication.shared.userInterfaceLayoutDirection {
case .rightToLeft:
rect.origin.x += widthChanged
default:
break
}
let path = UIBezierPath(rect: rect)
context.setFillColor(tintColor.cgColor)
context.addPath(path.cgPath)
context.fillPath()
contents = UIGraphicsGetImageFromCurrentImageContext()?.cgImage
UIGraphicsEndImageContext()
}
}
final class StripProgressView: UIView {
var disposeBag = Set<AnyCancellable>()
private let stripProgressLayer: StripProgressLayer = {
let layer = StripProgressLayer()
return layer
}()
override var tintColor: UIColor! {
didSet {
stripProgressLayer.tintColor = tintColor
setNeedsDisplay()
}
}
func setProgress(_ progress: CGFloat, animated: Bool) {
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stripProgressLayer.removeAnimation(forKey: StripProgressLayer.progressAnimationKey)
if animated {
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let animation = CABasicAnimation(keyPath: StripProgressLayer.progressKey)
animation.fromValue = stripProgressLayer.presentation()?.progress ?? stripProgressLayer.progress
animation.toValue = progress
animation.duration = 0.33
animation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
animation.isRemovedOnCompletion = true
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stripProgressLayer.add(animation, forKey: StripProgressLayer.progressAnimationKey)
stripProgressLayer.progress = progress
} else {
stripProgressLayer.progress = progress
stripProgressLayer.setNeedsDisplay()
}
}
override init(frame: CGRect) {
super.init(frame: frame)
_init()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
_init()
}
}
extension StripProgressView {
private func _init() {
layer.addSublayer(stripProgressLayer)
updateLayerPath()
}
override func layoutSubviews() {
super.layoutSubviews()
updateLayerPath()
}
}
extension StripProgressView {
private func updateLayerPath() {
guard bounds != .zero else { return }
stripProgressLayer.frame = bounds
stripProgressLayer.tintColor = tintColor
stripProgressLayer.setNeedsDisplay()
}
}
#if DEBUG
import SwiftUI
struct VoteProgressStripView_Previews: PreviewProvider {
static var previews: some View {
Group {
UIViewPreview() {
StripProgressView()
}
.frame(width: 100, height: 44)
.padding()
.background(Color.black)
.previewLayout(.sizeThatFits)
UIViewPreview() {
let bar = StripProgressView()
bar.tintColor = .white
bar.setProgress(0.5, animated: false)
return bar
}
.frame(width: 100, height: 44)
.padding()
.background(Color.black)
.previewLayout(.sizeThatFits)
UIViewPreview() {
let bar = StripProgressView()
bar.tintColor = .white
bar.setProgress(1.0, animated: false)
return bar
}
.frame(width: 100, height: 44)
.padding()
.background(Color.black)
.previewLayout(.sizeThatFits)
}
}
}
#endif