77 lines
3.7 KiB
Swift
77 lines
3.7 KiB
Swift
//
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// JXSegmentedTitleAttributeDataSource.swift
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// JXSegmentedView
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//
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// Created by jiaxin on 2019/1/2.
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// Copyright © 2019 jiaxin. All rights reserved.
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//
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import UIKit
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open class JXSegmentedTitleAttributeDataSource: JXSegmentedBaseDataSource {
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/// 富文本title数组
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open var attributedTitles = [NSAttributedString]()
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/// 选中时的富文本，可选。如果要使用确保count与attributedTitles一致。
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open var selectedAttributedTitles: [NSAttributedString]?
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/// 如果将JXSegmentedView嵌套进UITableView的cell，每次重用的时候，JXSegmentedView进行reloadData时，会重新计算所有的title宽度。所以该应用场景，需要UITableView的cellModel缓存titles的文字宽度，再通过该闭包方法返回给JXSegmentedView。
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open var widthForTitleClosure: ((NSAttributedString)->(CGFloat))?
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/// title的numberOfLines
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open var titleNumberOfLines: Int = 2
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open override func preferredItemModelInstance() -> JXSegmentedBaseItemModel {
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return JXSegmentedTitleAttributeItemModel()
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}
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open override func preferredItemCount() -> Int {
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return attributedTitles.count
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}
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open override func preferredRefreshItemModel(_ itemModel: JXSegmentedBaseItemModel, at index: Int, selectedIndex: Int) {
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super.preferredRefreshItemModel(itemModel, at: index, selectedIndex: selectedIndex)
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guard let myItemModel = itemModel as? JXSegmentedTitleAttributeItemModel else {
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return
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}
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myItemModel.attributedTitle = attributedTitles[index]
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myItemModel.selectedAttributedTitle = selectedAttributedTitles?[index]
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myItemModel.textWidth = widthForTitle(myItemModel.attributedTitle, selectedTitle: myItemModel.selectedAttributedTitle)
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myItemModel.titleNumberOfLines = titleNumberOfLines
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}
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open func widthForTitle(_ title: NSAttributedString?, selectedTitle: NSAttributedString?) -> CGFloat {
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let attriText = selectedTitle != nil ? selectedTitle : title
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guard let text = attriText else {
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return 0
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}
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if widthForTitleClosure != nil {
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return widthForTitleClosure!(text)
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}else {
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let textWidth = text.boundingRect(with: CGSize(width: CGFloat.infinity, height: CGFloat.infinity), options: NSStringDrawingOptions.init(rawValue: NSStringDrawingOptions.usesLineFragmentOrigin.rawValue | NSStringDrawingOptions.usesFontLeading.rawValue), context: nil).size.width
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return CGFloat(ceilf(Float(textWidth)))
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}
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}
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/// 因为该方法会被频繁调用，所以应该在`preferredRefreshItemModel( _ itemModel: JXSegmentedBaseItemModel, at index: Int, selectedIndex: Int)`方法里面，根据数据源计算好文字宽度，然后缓存起来。该方法直接使用已经计算好的文字宽度即可。
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open override func preferredSegmentedView(_ segmentedView: JXSegmentedView, widthForItemAt index: Int) -> CGFloat {
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var width: CGFloat = 0
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if itemWidth == JXSegmentedViewAutomaticDimension {
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let myItemModel = dataSource[index] as! JXSegmentedTitleAttributeItemModel
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width = myItemModel.textWidth + itemWidthIncrement
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}else {
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width = itemWidth + itemWidthIncrement
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}
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return width
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}
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//MARK: - JXSegmentedViewDataSource
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open override func registerCellClass(in segmentedView: JXSegmentedView) {
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segmentedView.collectionView.register(JXSegmentedTitleAttributeCell.self, forCellWithReuseIdentifier: "cell")
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}
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open override func segmentedView(_ segmentedView: JXSegmentedView, cellForItemAt index: Int) -> JXSegmentedBaseCell {
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let cell = segmentedView.dequeueReusableCell(withReuseIdentifier: "cell", at: index)
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return cell
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}
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}
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