回答編集履歴
3
追記
answer
CHANGED
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@@ -89,4 +89,6 @@
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89
89
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90
90
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}
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91
91
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}
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92
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-
```
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92
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+
```
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93
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+
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94
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+
選択されているセルのインデックスパスは、[indexPathsForSelectedItems](https://developer.apple.com/documentation/uikit/uicollectionview/1618099-indexpathsforselecteditems)とかでとれます
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2
誤字訂正
answer
CHANGED
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@@ -34,7 +34,7 @@
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34
34
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override func viewDidLoad() {
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35
35
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super.viewDidLoad()
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36
36
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37
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-
// 選択の
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37
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+
// 選択の条件を設定する
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38
38
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//collectionView.allowsSelection = true
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39
39
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collectionView.allowsMultipleSelection = true
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40
40
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}
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@@ -50,7 +50,6 @@
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50
50
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CustomCell
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51
51
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cell.label.text = String(format: "%02d", indexPath.row)
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52
52
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// ここで背景を設定するだけ
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53
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-
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54
53
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cell.selectedBackgroundView = CellBgView(num: indexPath.row)
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55
54
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return cell
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56
55
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}
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1
編集
answer
CHANGED
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@@ -1,6 +1,93 @@
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1
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-
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2
2
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3
3
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`CellForItemAtn`内で`UICollectionView`の`selectedBackgroundView`に用意したカスタムViewを突っ込んで、
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4
4
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UICollectionViewの`allowSelection`/`allowsMultipleSelection`プロパティを設定してあげれば、あとは何も記述しなくともよしなにやってくれます。
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5
5
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6
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-
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6
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+
私はこの方法が良いと思います。
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7
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+
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8
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+
```swift
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9
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+
import UIKit
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10
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+
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11
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+
// 背景用のView
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12
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+
class CellBgView: UIView {
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13
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+
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14
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+
init(num: Int) {
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15
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+
super.init(frame: CGRect.zero)
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16
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+
// 偶数と奇数で色変えてみよう
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17
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+
backgroundColor = num % 2 == 0 ? .red : .orange
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18
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+
}
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19
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+
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20
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+
required init(coder aDecoder: NSCoder) {
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21
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+
fatalError("init(coder:) has not been implemented")
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22
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+
}
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23
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+
}
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24
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+
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25
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+
class ViewController: UIViewController{
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26
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+
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27
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+
var array = [Int](0...30)
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|
28
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+
|
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29
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+
@IBOutlet weak var collectionView: UICollectionView!
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|
30
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+
|
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31
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+
private let sectionInsets = UIEdgeInsets(top: 20.0, left: 10.0, bottom: 20.0, right: 10.0)
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|
32
|
+
private let itemsPerRow: CGFloat = 3
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|
33
|
+
|
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34
|
+
override func viewDidLoad() {
|
|
35
|
+
super.viewDidLoad()
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|
36
|
+
|
|
37
|
+
// 選択の情景を設定する
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|
38
|
+
//collectionView.allowsSelection = true
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|
39
|
+
collectionView.allowsMultipleSelection = true
|
|
40
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+
}
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41
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+
}
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42
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+
|
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43
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+
extension ViewController: UICollectionViewDataSource {
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|
44
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+
|
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45
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+
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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|
46
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+
return array.count
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|
47
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+
}
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|
48
|
+
|
|
49
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+
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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|
50
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+
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CustomCell
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|
51
|
+
cell.label.text = String(format: "%02d", indexPath.row)
|
|
52
|
+
// ここで背景を設定するだけ
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|
53
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+
|
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54
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+
cell.selectedBackgroundView = CellBgView(num: indexPath.row)
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|
55
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+
return cell
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|
56
|
+
}
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|
57
|
+
|
|
58
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+
}
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59
|
+
|
|
60
|
+
class CustomCell: UICollectionViewCell {
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|
61
|
+
|
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62
|
+
@IBOutlet weak var label: UILabel!
|
|
63
|
+
|
|
64
|
+
}
|
|
65
|
+
|
|
66
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+
|
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67
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+
// あとはレイアウト用です
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68
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+
|
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69
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+
extension ViewController: UICollectionViewDelegateFlowLayout {
|
|
70
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+
|
|
71
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+
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
|
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72
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+
|
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73
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+
let paddingSpace = sectionInsets.left * (itemsPerRow + 1)
|
|
74
|
+
let availableWidth = UIScreen.main.bounds.width - paddingSpace
|
|
75
|
+
let withPerItem = availableWidth / itemsPerRow
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|
76
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+
|
|
77
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+
//cellの大きさを返す
|
|
78
|
+
return CGSize(width: withPerItem, height: withPerItem)
|
|
79
|
+
}
|
|
80
|
+
|
|
81
|
+
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
|
|
82
|
+
|
|
83
|
+
return sectionInsets
|
|
84
|
+
|
|
85
|
+
}
|
|
86
|
+
|
|
87
|
+
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
|
|
88
|
+
|
|
89
|
+
return sectionInsets.left
|
|
90
|
+
|
|
91
|
+
}
|
|
92
|
+
}
|
|
93
|
+
```
|