175 lines
8.5 KiB
Swift
175 lines
8.5 KiB
Swift
//
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// JXSegmentedBaseDataSource.swift
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// JXSegmentedView
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//
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// Created by jiaxin on 2018/12/28.
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// Copyright © 2018 jiaxin. All rights reserved.
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//
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import Foundation
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import UIKit
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open class JXSegmentedBaseDataSource: JXSegmentedViewDataSource {
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/// 最终传递给JXSegmentedView的数据源数组
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open var dataSource = [JXSegmentedBaseItemModel]()
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/// cell的宽度。为JXSegmentedViewAutomaticDimension时就以内容计算的宽度为准，否则以itemWidth的具体值为准。
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open var itemWidth: CGFloat = JXSegmentedViewAutomaticDimension
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/// 真实的item宽度 = itemWidth + itemWidthIncrement。
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open var itemWidthIncrement: CGFloat = 0
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/// item之前的间距
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open var itemSpacing: CGFloat = 20
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/// 当collectionView.contentSize.width小于JXSegmentedView的宽度时，是否将itemSpacing均分。
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open var isItemSpacingAverageEnabled: Bool = true
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/// item左右滚动过渡时，是否允许渐变。比如JXSegmentedTitleDataSource的titleZoom、titleNormalColor、titleStrokeWidth等渐变。
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open var isItemTransitionEnabled: Bool = true
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/// 选中的时候，是否需要动画过渡。自定义的cell需要自己处理动画过渡逻辑，动画处理逻辑参考`JXSegmentedTitleCell`
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open var isSelectedAnimable: Bool = false
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/// 选中动画的时长
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open var selectedAnimationDuration: TimeInterval = 0.25
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/// 是否允许item宽度缩放
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open var isItemWidthZoomEnabled: Bool = false
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/// 是否允许item宽度缩放动画
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open var isItemWidthZoomAnimable: Bool = true
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/// item宽度选中时的scale
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open var itemWidthSelectedZoomScale: CGFloat = 1.5
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@available(*, deprecated, renamed: "itemWidth")
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open var itemContentWidth: CGFloat = JXSegmentedViewAutomaticDimension {
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didSet {
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itemWidth = itemContentWidth
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}
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}
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private var animator: JXSegmentedAnimator?
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deinit {
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animator?.stop()
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}
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public init() {
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}
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/// 配置完各种属性之后，需要手动调用该方法，更新数据源
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///
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/// - Parameter selectedIndex: 当前选中的index
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open func reloadData(selectedIndex: Int) {
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dataSource.removeAll()
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for index in 0..<preferredItemCount() {
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let itemModel = preferredItemModelInstance()
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preferredRefreshItemModel(itemModel, at: index, selectedIndex: selectedIndex)
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dataSource.append(itemModel)
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}
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}
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open func preferredItemCount() -> Int {
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return 0
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}
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/// 子类需要重载该方法，用于返回自己定义的JXSegmentedBaseItemModel子类实例
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open func preferredItemModelInstance() -> JXSegmentedBaseItemModel {
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return JXSegmentedBaseItemModel()
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}
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/// 子类需要重载该方法，用于返回索引为index的item宽度
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open func preferredSegmentedView(_ segmentedView: JXSegmentedView, widthForItemAt index: Int) -> CGFloat {
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return itemWidthIncrement
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}
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/// 子类需要重载该方法，用于更新索引为index的itemModel
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open func preferredRefreshItemModel(_ itemModel: JXSegmentedBaseItemModel, at index: Int, selectedIndex: Int) {
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itemModel.index = index
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itemModel.isItemTransitionEnabled = isItemTransitionEnabled
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itemModel.isSelectedAnimable = isSelectedAnimable
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itemModel.selectedAnimationDuration = selectedAnimationDuration
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itemModel.isItemWidthZoomEnabled = isItemWidthZoomEnabled
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itemModel.itemWidthNormalZoomScale = 1
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itemModel.itemWidthSelectedZoomScale = itemWidthSelectedZoomScale
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if index == selectedIndex {
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itemModel.isSelected = true
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itemModel.itemWidthCurrentZoomScale = itemModel.itemWidthSelectedZoomScale
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}else {
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itemModel.isSelected = false
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itemModel.itemWidthCurrentZoomScale = itemModel.itemWidthNormalZoomScale
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}
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}
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//MARK: - JXSegmentedViewDataSource
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open func itemDataSource(in segmentedView: JXSegmentedView) -> [JXSegmentedBaseItemModel] {
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return dataSource
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}
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/// 自定义子类请继承方法`func preferredWidthForItem(at index: Int) -> CGFloat`
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public final func segmentedView(_ segmentedView: JXSegmentedView, widthForItemAt index: Int) -> CGFloat {
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return preferredSegmentedView(segmentedView, widthForItemAt: index)
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}
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public func segmentedView(_ segmentedView: JXSegmentedView, widthForItemContentAt index: Int) -> CGFloat {
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return self.segmentedView(segmentedView, widthForItemAt: index)
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}
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open func registerCellClass(in segmentedView: JXSegmentedView) {
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}
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open func segmentedView(_ segmentedView: JXSegmentedView, cellForItemAt index: Int) -> JXSegmentedBaseCell {
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return JXSegmentedBaseCell()
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}
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open func refreshItemModel(_ segmentedView: JXSegmentedView, currentSelectedItemModel: JXSegmentedBaseItemModel, willSelectedItemModel: JXSegmentedBaseItemModel, selectedType: JXSegmentedViewItemSelectedType) {
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currentSelectedItemModel.isSelected = false
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willSelectedItemModel.isSelected = true
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if isItemWidthZoomEnabled {
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if (selectedType == .scroll && !isItemTransitionEnabled) ||
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selectedType == .click ||
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selectedType == .code {
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animator = JXSegmentedAnimator()
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animator?.duration = selectedAnimationDuration
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animator?.progressClosure = {[weak self] (percent) in
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guard let self = self else { return }
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currentSelectedItemModel.itemWidthCurrentZoomScale = JXSegmentedViewTool.interpolate(from: currentSelectedItemModel.itemWidthSelectedZoomScale, to: currentSelectedItemModel.itemWidthNormalZoomScale, percent: percent)
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currentSelectedItemModel.itemWidth = self.itemWidthWithZoom(at: currentSelectedItemModel.index, model: currentSelectedItemModel)
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willSelectedItemModel.itemWidthCurrentZoomScale = JXSegmentedViewTool.interpolate(from: willSelectedItemModel.itemWidthNormalZoomScale, to: willSelectedItemModel.itemWidthSelectedZoomScale, percent: percent)
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willSelectedItemModel.itemWidth = self.itemWidthWithZoom(at: willSelectedItemModel.index, model: willSelectedItemModel)
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segmentedView.collectionView.collectionViewLayout.invalidateLayout()
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}
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if isItemWidthZoomAnimable {
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animator?.start()
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}else {
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animator?.stop()
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}
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}
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}else {
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currentSelectedItemModel.itemWidthCurrentZoomScale = currentSelectedItemModel.itemWidthNormalZoomScale
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willSelectedItemModel.itemWidthCurrentZoomScale = willSelectedItemModel.itemWidthSelectedZoomScale
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}
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}
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open func refreshItemModel(_ segmentedView: JXSegmentedView, leftItemModel: JXSegmentedBaseItemModel, rightItemModel: JXSegmentedBaseItemModel, percent: CGFloat) {
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//如果正在进行itemWidth缩放动画，用户又立马滚动了contentScrollView，需要停止动画。
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animator?.stop()
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animator = nil
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if isItemWidthZoomEnabled && isItemTransitionEnabled {
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//允许itemWidth缩放动画且允许item渐变过渡
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leftItemModel.itemWidthCurrentZoomScale = JXSegmentedViewTool.interpolate(from: leftItemModel.itemWidthSelectedZoomScale, to: leftItemModel.itemWidthNormalZoomScale, percent: percent)
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leftItemModel.itemWidth = itemWidthWithZoom(at: leftItemModel.index, model: leftItemModel)
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rightItemModel.itemWidthCurrentZoomScale = JXSegmentedViewTool.interpolate(from: rightItemModel.itemWidthNormalZoomScale, to: rightItemModel.itemWidthSelectedZoomScale, percent: percent)
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rightItemModel.itemWidth = itemWidthWithZoom(at: rightItemModel.index, model: rightItemModel)
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segmentedView.collectionView.collectionViewLayout.invalidateLayout()
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}
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}
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/// 自定义子类请继承方法`func preferredRefreshItemModel(_ itemModel: JXSegmentedBaseItemModel, at index: Int, selectedIndex: Int)`
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public final func refreshItemModel(_ segmentedView: JXSegmentedView, _ itemModel: JXSegmentedBaseItemModel, at index: Int, selectedIndex: Int) {
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preferredRefreshItemModel(itemModel, at: index, selectedIndex: selectedIndex)
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}
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private func itemWidthWithZoom(at index: Int, model: JXSegmentedBaseItemModel) -> CGFloat {
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var width = self.segmentedView(JXSegmentedView(), widthForItemAt: index)
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if isItemWidthZoomEnabled {
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width *= model.itemWidthCurrentZoomScale
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}
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return width
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}
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}
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