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Add ListStateObserver and ListActions for listening to and performing…
… list actions.
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Demo/Sources/Demos/Demo Screens/ListStateViewController.swift
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| // | ||
| // ListStateViewController.swift | ||
| // Demo | ||
| // | ||
| // Created by Kyle Van Essen on 7/11/20. | ||
| // Copyright © 2020 Kyle Van Essen. All rights reserved. | ||
| // | ||
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| import BlueprintLists | ||
| import BlueprintUICommonControls | ||
| import Combine | ||
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| /// Includes combine examples, so only available on iOS 13.0+. | ||
| @available(iOS 13.0, *) | ||
| final class ListStateViewController : ListViewController | ||
| { | ||
| let actions = ListActions() | ||
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| @Published var index : Int = 1 | ||
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| override func configure(list : inout ListProperties) | ||
| { | ||
| list.appearance = .demoAppearance | ||
| list.layout = .demoLayout | ||
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| list("1") { section in | ||
| (1...100).forEach { count in | ||
| section += DemoItem(text: "Item #\(count)") | ||
| } | ||
| } | ||
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| list.actions = self.actions | ||
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| list.stateObserver = ListStateObserver { observer in | ||
| observer.onDidScroll { info in | ||
| print("Did Scroll: Scroll Type: \(info.scrollType)") | ||
| } | ||
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| observer.onVisibilityChanged { info in | ||
| print("Displayed: \(info.displayed.map { $0.identifier })") | ||
| print("Ended Display: \(info.endedDisplay.map { $0.identifier })") | ||
| } | ||
| } | ||
| } | ||
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| var cancel : AnyCancellable? = nil | ||
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
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| /// Example of how to use the `actions` within a reactive framwork like Combine or ReactiveSwift. | ||
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| cancel = $index.sink { [weak self] value in | ||
| self?.actions.scrolling.scrollTo( | ||
| item: Identifier<DemoItem>("Item #\(value)"), | ||
| position: .init(position: .top, ifAlreadyVisible: .scrollToPosition), | ||
| animated: true | ||
| ) | ||
| } | ||
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| self.navigationItem.rightBarButtonItems = [ | ||
| UIBarButtonItem(title: "Up", style: .plain, target: self, action: #selector(scrollUp)), | ||
| UIBarButtonItem(title: "Down", style: .plain, target: self, action: #selector(scrollDown)), | ||
| UIBarButtonItem(title: "Signal", style: .plain, target: self, action: #selector(doSignal)) | ||
| ] | ||
| } | ||
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| @objc private func scrollUp() | ||
| { | ||
| self.actions.scrolling.scrollToTop(animated: true) | ||
| } | ||
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| @objc private func scrollDown() | ||
| { | ||
| self.actions.scrolling.scrollToLastItem(animated: true) | ||
| } | ||
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| @objc private func doSignal() | ||
| { | ||
| self.index += 1 | ||
| } | ||
| } |
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