回答編集履歴
3
追記
test
CHANGED
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@@ -181,3 +181,7 @@
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181
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}
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```
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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
test
CHANGED
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@@ -70,7 +70,7 @@
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70
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71
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72
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73
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-
// 選択の
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73
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// 選択の条件を設定する
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74
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//collectionView.allowsSelection = true
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@@ -101,8 +101,6 @@
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cell.label.text = String(format: "%02d", indexPath.row)
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// ここで背景を設定するだけ
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104
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-
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105
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-
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cell.selectedBackgroundView = CellBgView(num: indexPath.row)
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1
編集
test
CHANGED
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@@ -1,4 +1,4 @@
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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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4
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@@ -8,4 +8,178 @@
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8
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-
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11
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+
私はこの方法が良いと思います。
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12
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13
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14
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15
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```swift
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16
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17
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import UIKit
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19
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20
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21
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// 背景用のView
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22
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class CellBgView: UIView {
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init(num: Int) {
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28
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29
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super.init(frame: CGRect.zero)
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30
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31
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// 偶数と奇数で色変えてみよう
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32
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33
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backgroundColor = num % 2 == 0 ? .red : .orange
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34
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}
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36
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39
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required init(coder aDecoder: NSCoder) {
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40
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41
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fatalError("init(coder:) has not been implemented")
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42
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43
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}
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45
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}
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class ViewController: UIViewController{
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50
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51
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53
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var array = [Int](0...30)
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54
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56
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57
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@IBOutlet weak var collectionView: UICollectionView!
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59
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60
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61
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private let sectionInsets = UIEdgeInsets(top: 20.0, left: 10.0, bottom: 20.0, right: 10.0)
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62
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63
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private let itemsPerRow: CGFloat = 3
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64
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65
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66
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67
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override func viewDidLoad() {
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68
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69
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super.viewDidLoad()
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70
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71
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72
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73
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// 選択の情景を設定する
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74
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75
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//collectionView.allowsSelection = true
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76
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77
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collectionView.allowsMultipleSelection = true
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78
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79
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}
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80
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81
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}
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82
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83
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84
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85
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extension ViewController: UICollectionViewDataSource {
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86
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87
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88
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89
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func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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90
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91
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return array.count
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92
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93
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}
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94
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95
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96
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97
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func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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98
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99
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CustomCell
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100
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101
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cell.label.text = String(format: "%02d", indexPath.row)
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102
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+
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103
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// ここで背景を設定するだけ
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104
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+
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105
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+
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106
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+
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107
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cell.selectedBackgroundView = CellBgView(num: indexPath.row)
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108
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109
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return cell
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110
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111
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}
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112
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113
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114
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115
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}
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116
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117
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118
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119
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class CustomCell: UICollectionViewCell {
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120
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121
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122
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123
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@IBOutlet weak var label: UILabel!
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124
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125
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126
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127
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}
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128
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129
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130
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131
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132
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133
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// あとはレイアウト用です
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134
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135
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136
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137
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extension ViewController: UICollectionViewDelegateFlowLayout {
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138
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139
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140
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141
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
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142
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+
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143
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+
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144
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+
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145
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let paddingSpace = sectionInsets.left * (itemsPerRow + 1)
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146
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+
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147
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+
let availableWidth = UIScreen.main.bounds.width - paddingSpace
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|
148
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+
|
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149
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+
let withPerItem = availableWidth / itemsPerRow
|
|
150
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+
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151
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+
|
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152
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+
|
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153
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+
//cellの大きさを返す
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154
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+
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155
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+
return CGSize(width: withPerItem, height: withPerItem)
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156
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+
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157
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+
}
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158
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+
|
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159
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+
|
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160
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+
|
|
161
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+
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
|
|
162
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+
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163
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+
|
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164
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+
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165
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+
return sectionInsets
|
|
166
|
+
|
|
167
|
+
|
|
168
|
+
|
|
169
|
+
}
|
|
170
|
+
|
|
171
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+
|
|
172
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+
|
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173
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+
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
|
|
174
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+
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175
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+
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176
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+
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177
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+
return sectionInsets.left
|
|
178
|
+
|
|
179
|
+
|
|
180
|
+
|
|
181
|
+
}
|
|
182
|
+
|
|
183
|
+
}
|
|
184
|
+
|
|
185
|
+
```
|