質問編集履歴
1
collectionViewの処理を追記
test
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test
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@@ -5,6 +5,8 @@
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やりたいこととしては、collectionViewのcellForItemAtメソッドからcell内の変数に値を渡して、その値をcellのラベルに表示するということなのですが、下記のようにcell内の変数のdidSetで処理を行うと、labelがnilの状態なのでエラーとなってしまいます。
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```swift
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//セルの処理
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class MenuBarViewCell: UICollectionViewCell {
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@@ -26,6 +28,136 @@
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```
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```swift
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//collectionViewの処理
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class MenuBarView: UIView {
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var pageTabItemsWidth: CGFloat = 0.0
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var collectionView:UICollectionView!
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var titles: [String] = Constant.menuTitle
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override init(frame: CGRect) {
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super.init(frame: frame)
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setUpCollectionView()
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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}
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extension MenuBarView: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
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fileprivate func setUpCollectionView(){
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let layout = UICollectionViewFlowLayout()
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layout.itemSize = CGSize(width:100, height:30)
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layout.scrollDirection = .horizontal
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collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height), collectionViewLayout: layout)
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// Cellに使われるクラスを登録.
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collectionView.delegate = self
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collectionView.dataSource = self
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collectionView.showsHorizontalScrollIndicator = false
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collectionView.register(MenuBarViewCell.self, forCellWithReuseIdentifier: "MyCell")
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self.addSubview(collectionView)
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}
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func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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return titles.count * 3
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}
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/*
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Cellに値を設定する
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*/
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func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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let cell : MenuBarViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell",for: indexPath) as! MenuBarViewCell
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configureCell(cell: cell, indexPath: indexPath)
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return cell
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}
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private func configureCell(cell:MenuBarViewCell, indexPath: IndexPath){
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let fixedIndex = indexPath.item % titles.count
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cell.title = titles[fixedIndex]
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}
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}
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extension MenuBarView: UIScrollViewDelegate {
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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if pageTabItemsWidth == 0.0 {
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136
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pageTabItemsWidth = floor(scrollView.contentSize.width / 3.0) // 表示したい要素群のwidthを計算
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}
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if (scrollView.contentOffset.x <= 0.0) || (scrollView.contentOffset.x > pageTabItemsWidth * 2.0) { // スクロールした位置がしきい値を超えたら中央に戻す
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scrollView.contentOffset.x = pageTabItemsWidth
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}
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}
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150
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}
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152
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153
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154
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155
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```
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156
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157
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158
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159
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160
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29
161
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イニシャライザで行っても同様です。
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30
162
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31
163
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