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Optimize for more efficient and predictable performance by changing Array to CountiguousArray #825

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ba7ebd7
Replace Array<ViewController> with Contiguous Array<UIViewController>
wanderingfairy Jun 24, 2021
06e023c
Merge branch 'optimizedArray'
wanderingfairy Jun 24, 2021
2d5d673
Replace Array<ViewController> with Contiguous Array<UIViewController>
wanderingfairy Jun 24, 2021
a40b0ea
Merge remote-tracking branch 'origin/master'
wanderingfairy Jun 24, 2021
f5a7529
Replace Array with ContiguousArray in Example project
wanderingfairy Jun 24, 2021
844260e
Merge branch 'optimizeArray'
wanderingfairy Jun 24, 2021
adfa765
Add PRTemplate
wanderingfairy Jun 28, 2021
e5aac29
Merge branch 'master' into master
wanderingfairy Aug 30, 2021
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34 changes: 34 additions & 0 deletions .github/PULL_REQUEST_TEMPLATE.md
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I changed to use ContiguousArray< UIViewController > type to store UIViewControllers in a contiguous block of memory.

When using a large number of UIViewControllers as tabs, I think that using ContiguousArray will yield more predictable performance compared to Array.



The changed files are:

- Sources/PagerTabStripViewController.swift

for Example:

- BarExampleViewController.swift
- ButtonBarExampleViewController.swift
- InstagramExampleViewController.swift
- NavButtonBarExampleViewController.swift
- SegmentedExampleViewController.swift
- SpotifyExampleViewController.swift
- TwitterExampleViewController.swift
- YoutubeExampleViewController.swift
- YoutubeWithLabelExampleViewController.swift



References

- https://github.com/apple/swift/blob/main/docs/Arrays.rst

- https://developer.apple.com/documentation/swift/contiguousarray

- https://github.com/apple/swift/blob/main/docs/OptimizationTips.rst#advice-use-contiguousarray-with-reference-types-when-nsarray-bridging-is-unnecessary

- http://jordansmith.io/on-performant-arrays-in-swift/
- https://medium.com/@nitingeorge_39047/swift-array-vs-contiguousarray-a6153098a5
4 changes: 2 additions & 2 deletions Example/Example/BarExampleViewController.swift
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Expand Up @@ -43,7 +43,7 @@ class BarExampleViewController: BarPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {

let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "Table View")
let child_2 = ChildExampleViewController(itemInfo: "View")
Expand All @@ -63,7 +63,7 @@ class BarExampleViewController: BarPagerTabStripViewController {
}
}
let nItems = 1 + (arc4random() % 4)
return Array(childViewControllers.prefix(Int(nItems)))
return ContiguousArray(childViewControllers.prefix(Int(nItems)))
}

override func reloadPagerTabStripView() {
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4 changes: 2 additions & 2 deletions Example/Example/ButtonBarExampleViewController.swift
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Expand Up @@ -38,7 +38,7 @@ class ButtonBarExampleViewController: ButtonBarPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "Table View")
let child_2 = ChildExampleViewController(itemInfo: "View")
let child_3 = TableChildExampleViewController(style: .grouped, itemInfo: "Table View 2")
Expand All @@ -62,7 +62,7 @@ class ButtonBarExampleViewController: ButtonBarPagerTabStripViewController {
}
}
let nItems = 1 + (arc4random() % 8)
return Array(childViewControllers.prefix(Int(nItems)))
return ContiguousArray(childViewControllers.prefix(Int(nItems)))
}

override func reloadPagerTabStripView() {
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2 changes: 1 addition & 1 deletion Example/Example/Instagram/InstagramExampleViewController.swift
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Expand Up @@ -53,7 +53,7 @@ class InstagramExampleViewController: ButtonBarPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "FOLLOWING")
let child_2 = ChildExampleViewController(itemInfo: "YOU")
return [child_1, child_2]
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4 changes: 2 additions & 2 deletions Example/Example/NavButtonBarExampleViewController.swift
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Expand Up @@ -58,7 +58,7 @@ class NavButtonBarExampleViewController: ButtonBarPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "Table View")
let child_2 = ChildExampleViewController(itemInfo: "View")
let child_3 = TableChildExampleViewController(style: .grouped, itemInfo: "Table View 2")
Expand All @@ -82,7 +82,7 @@ class NavButtonBarExampleViewController: ButtonBarPagerTabStripViewController {
}
}
let nItems = 1 + (arc4random() % 8)
return Array(childViewControllers.prefix(Int(nItems)))
return ContiguousArray(childViewControllers.prefix(Int(nItems)))
}

override func reloadPagerTabStripView() {
Expand Down
4 changes: 2 additions & 2 deletions Example/Example/SegmentedExampleViewController.swift
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Expand Up @@ -37,7 +37,7 @@ class SegmentedExampleViewController: SegmentedPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "Table View")
let child_2 = ChildExampleViewController(itemInfo: "View")
let child_3 = TableChildExampleViewController(style: .grouped, itemInfo: "Table View 2")
Expand All @@ -58,7 +58,7 @@ class SegmentedExampleViewController: SegmentedPagerTabStripViewController {
}
}
let nItems = 1 + (arc4random() % 4)
return Array(childViewControllers.prefix(Int(nItems)))
return ContiguousArray(childViewControllers.prefix(Int(nItems)))
}

@IBAction func reloadTapped(_ sender: UIBarButtonItem) {
Expand Down
2 changes: 1 addition & 1 deletion Example/Example/Spotify/SpotifyExampleViewController.swift
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Expand Up @@ -56,7 +56,7 @@ class SpotifyExampleViewController: ButtonBarPagerTabStripViewController {

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: "FRIENDS"))
child_1.blackTheme = true
let child_2 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: "FEATURED"))
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4 changes: 2 additions & 2 deletions Example/Example/TwitterExampleViewController.swift
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Expand Up @@ -28,7 +28,7 @@ import XLPagerTabStrip
class TwitterExampleViewController: TwitterPagerTabStripViewController {
var isReload = false

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {

let child_1 = TableChildExampleViewController(style: .plain, itemInfo: "TableView")
let child_2 = ChildExampleViewController(itemInfo: "View")
Expand All @@ -53,7 +53,7 @@ class TwitterExampleViewController: TwitterPagerTabStripViewController {
}
}
let nItems = 1 + (arc4random() % 8)
return Array(childViewControllers.prefix(Int(nItems)))
return ContiguousArray(childViewControllers.prefix(Int(nItems)))
}

@IBAction func reloadTapped(_ sender: AnyObject) {
Expand Down
2 changes: 1 addition & 1 deletion Example/Example/Youtube/YoutubeExampleViewController.swift
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Expand Up @@ -66,7 +66,7 @@ class YoutubeExampleViewController: BaseButtonBarPagerTabStripViewController<You

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: " HOME", image: UIImage(named: "home")))
let child_2 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: " TRENDING", image: UIImage(named: "trending")))
let child_3 = ChildExampleViewController(itemInfo: IndicatorInfo(title: " ACCOUNT", image: UIImage(named: "profile")))
Expand Down
2 changes: 1 addition & 1 deletion Example/Example/YoutubeWithLabel/YoutubeWithLabelExampleViewController.swift
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Expand Up @@ -68,7 +68,7 @@ class YoutubeWithLabelExampleViewController: BaseButtonBarPagerTabStripViewContr

// MARK: - PagerTabStripDataSource

override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
let child_1 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: " HOME", image: UIImage(named: "home")))
let child_2 = TableChildExampleViewController(style: .plain, itemInfo: IndicatorInfo(title: " TRENDING", image: UIImage(named: "trending")))
let child_3 = ChildExampleViewController(itemInfo: IndicatorInfo(title: " ACCOUNT", image: UIImage(named: "profile")))
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8 changes: 4 additions & 4 deletions Sources/PagerTabStripViewController.swift
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Expand Up @@ -44,7 +44,7 @@ public protocol PagerTabStripIsProgressiveDelegate: PagerTabStripDelegate {

public protocol PagerTabStripDataSource: class {

func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController]
func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController>
}

// MARK: PagerTabStripViewController
Expand All @@ -58,7 +58,7 @@ open class PagerTabStripViewController: UIViewController, UIScrollViewDelegate {

open var pagerBehaviour = PagerTabStripBehaviour.progressive(skipIntermediateViewControllers: true, elasticIndicatorLimit: true)

open private(set) var viewControllers = [UIViewController]()
open private(set) var viewControllers = ContiguousArray<UIViewController>()
open private(set) var currentIndex = 0
open private(set) var preCurrentIndex = 0 // used *only* to store the index to which move when the pager becomes visible

Expand Down Expand Up @@ -177,7 +177,7 @@ open class PagerTabStripViewController: UIViewController, UIScrollViewDelegate {

// MARK: - PagerTabStripDataSource

open func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
open func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> ContiguousArray<UIViewController> {
assertionFailure("Sub-class must implement the PagerTabStripDataSource viewControllers(for:) method")
return []
}
Expand Down Expand Up @@ -385,7 +385,7 @@ open class PagerTabStripViewController: UIViewController, UIScrollViewDelegate {

}

private var pagerTabStripChildViewControllersForScrolling: [UIViewController]?
private var pagerTabStripChildViewControllersForScrolling: ContiguousArray<UIViewController>?
private var lastPageNumber = 0
private var lastContentOffset: CGFloat = 0.0
private var pageBeforeRotate = 0
Expand Down
8 changes: 8 additions & 0 deletions XLPagerTabStrip.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
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@@ -0,0 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>IDEDidComputeMac32BitWarning</key>
<true/>
</dict>
</plist>