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Fix a crash that could happen when laying out the progress view while it’s not in the view hierarchy. Fix #1764.

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This commit is contained in:
Brent Simmons 2020-02-01 12:19:39 -08:00
parent 2f9506a8b8
commit b50fabe325
1 changed files with 26 additions and 12 deletions
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38
iOS/MasterFeed/RefreshProgressView.swift
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@ -13,7 +13,7 @@ class RefreshProgressView: UIView {
@IBOutlet weak var progressView: UIProgressView!
@IBOutlet weak var label: UILabel!
private lazy var progressWidth = progressView.widthAnchor.constraint(equalToConstant: 100.0)
private lazy var progressWidthConstraint = progressView.widthAnchor.constraint(equalToConstant: 100.0)
override func awakeFromNib() {
NotificationCenter.default.addObserver(self, selector: #selector(progressDidChange(_:)), name: .AccountRefreshProgressDidChange, object: nil)
@ -28,6 +28,10 @@ class RefreshProgressView: UIView {
scheduleUpdateRefreshLabel()
}
override func didMoveToSuperview() {
progressChanged()
}
func updateRefreshLabel() {
if let accountLastArticleFetchEndTime = AccountManager.shared.lastArticleFetchEndTime {
@ -71,28 +75,38 @@ class RefreshProgressView: UIView {
private extension RefreshProgressView {
func progressChanged() {
// Layout may crash if not in the view hierarchy.
// https://github.com/Ranchero-Software/NetNewsWire/issues/1764
let isInViewHierarchy = self.superview != nil
let progress = AccountManager.shared.combinedRefreshProgress
if progress.isComplete {
progressView.setProgress(1, animated: true)
if isInViewHierarchy {
progressView.setProgress(1, animated: true)
}
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
self.updateRefreshLabel()
self.label.isHidden = false
self.progressView.isHidden = true
self.progressWidth.isActive = false
self.progressView.setProgress(0, animated: true)
self.progressWidthConstraint.isActive = false
if isInViewHierarchy {
self.progressView.setProgress(0, animated: true)
}
}
} else {
label.isHidden = true
progressView.isHidden = false
self.progressWidth.isActive = true
self.progressView.setNeedsLayout()
self.progressView.layoutIfNeeded()
let percent = Float(progress.numberCompleted) / Float(progress.numberOfTasks)
// Don't let the progress bar go backwards unless we need to go back more than 25%
if percent > progressView.progress || progressView.progress - percent > 0.25 {
progressView.setProgress(percent, animated: true)
progressWidthConstraint.isActive = true
if isInViewHierarchy {
progressView.setNeedsLayout()
progressView.layoutIfNeeded()
let percent = Float(progress.numberCompleted) / Float(progress.numberOfTasks)
// Don't let the progress bar go backwards unless we need to go back more than 25%
if percent > progressView.progress || progressView.progress - percent > 0.25 {
progressView.setProgress(percent, animated: true)
}
}
}
}