回答編集履歴
1
中央値を取る方法
answer
CHANGED
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@@ -8,4 +8,79 @@
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[id: 3, order: 1, name: "キジ"],
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[id: 4, order: 3, name: "トラ"]
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]
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```
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```
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# 中央値を取る方法
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Swift2の丸投げコードです。
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セルはRight Detailで。
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```swift
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class TableViewController: UITableViewController {
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var array = [
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["id": 0, "order": 2.0, "name": "猫"],
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["id": 1, "order": 0.0, "name": "犬"],
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["id": 2, "order": 4.0, "name": "猿"],
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["id": 3, "order": 1.0, "name": "キジ"],
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["id": 4, "order": 3.0, "name": "トラ"],
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]
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override func viewDidLoad() {
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super.viewDidLoad()
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self.navigationItem.rightBarButtonItem = self.editButtonItem()
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self.sortArray()
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}
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func sortArray() {
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array = array.sort{($0["order"] as! Double) < ($1["order"] as! Double)}
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}
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override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return array.count
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}
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override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
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let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
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let obj = array[indexPath.row]
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cell.detailTextLabel!.text = "\(obj["order"]!)"
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cell.textLabel!.text = obj["name"] as? String
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return cell
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}
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override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {
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print("from \(fromIndexPath.row) to \(toIndexPath.row)")
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if fromIndexPath.row == toIndexPath.row {
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print("skip")
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} else {
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var newOrder: Double
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if toIndexPath.row == 0 {
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//一番上に移動した場合は先頭セル - 1
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newOrder = (array[toIndexPath.row]["order"] as! Double) - 1.0
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} else if toIndexPath.row == array.count - 1 {
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//一番下に移動した場合は末尾セル + 1
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newOrder = (array[toIndexPath.row]["order"] as! Double) + 1.0
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} else {
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//途中に移動したときは上下セルの中央値
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var rowPrev: Int, rowNext: Int;
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if (toIndexPath.row < fromIndexPath.row) {
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//上に移動した場合
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rowPrev = toIndexPath.row - 1
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rowNext = toIndexPath.row
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} else {
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//下に移動した場合
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rowPrev = toIndexPath.row
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rowNext = toIndexPath.row + 1
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}
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newOrder = ((array[rowPrev]["order"] as! Double) + (array[rowNext]["order"] as! Double)) / 2.0
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}
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array[fromIndexPath.row]["order"] = newOrder
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self.sortArray()
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tableView.reloadData()
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}
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}
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}
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```
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