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Add control over list scrolling position. Improve test stability (#7)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| // | ||
| // BottomAlignTableView.swift | ||
| // B9ChatAI | ||
| // | ||
| // Copyright © 2023 B9Software. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| class BottomAlignTableView: UITableView { | ||
|
|
||
| override var contentSize: CGSize { | ||
| didSet { | ||
| if oldValue == contentSize { | ||
| return | ||
| } | ||
| debug("contentSize: \(oldValue) => \(contentSize)") | ||
| adjustContentInset() | ||
|
|
||
| let yDiff = contentSize.height - oldValue.height | ||
| var offset = contentOffset | ||
| offset.y += yDiff | ||
| if offset.y < -safeAreaInsets.top { | ||
| debug("reach top, skip") | ||
| return | ||
| } | ||
| debug("will adjust offset: \(offset)") | ||
| contentOffset = offset | ||
| ignoralNextOffsetUpdate = CFAbsoluteTimeGetCurrent() | ||
| } | ||
| } | ||
|
|
||
| private var ignoralNextOffsetUpdate: CFAbsoluteTime = 0 | ||
| override var contentOffset: CGPoint { | ||
| get { | ||
| super.contentOffset | ||
| } | ||
| set { | ||
| if ignoralNextOffsetUpdate > 0 { | ||
| if CFAbsoluteTimeGetCurrent() - ignoralNextOffsetUpdate < 1e-3 { | ||
| debug("contentOffset: ignoral system adjust") | ||
| return | ||
| } | ||
| ignoralNextOffsetUpdate = 0 | ||
| } | ||
| let oldValue = super.contentOffset | ||
| super.contentOffset = newValue | ||
| if oldValue.y != newValue.y { | ||
| debug("contentOffset: \(oldValue.y) => \(newValue.y)") | ||
| } | ||
| } | ||
| } | ||
|
|
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| override func safeAreaInsetsDidChange() { | ||
| super.safeAreaInsetsDidChange() | ||
| adjustContentInset() | ||
| } | ||
|
|
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| private func adjustContentInset() { | ||
| let oldValue = contentInset.top | ||
| let newValue = max(bounds.height - safeAreaInsets.top - safeAreaInsets.bottom - contentSize.height, 0) | ||
| if abs(newValue - oldValue) < 1 { | ||
| return | ||
| } | ||
| var inset = contentInset | ||
| inset.top = newValue | ||
| contentInset = inset | ||
| debug("adjust inset: \(inset)") | ||
| } | ||
|
|
||
| private func debug(_ value: @autoclosure () -> CustomStringConvertible) { | ||
| // print(value().description) | ||
| } | ||
| } |
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