回答編集履歴
1
dataStoreのvalueがIntの配列になってなかったので修正
test
CHANGED
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@@ -72,7 +72,7 @@
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```swift
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-
let dataSource: [String: Int] = {
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+
let dataSource: [String: [Int]] = {
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"20150923": [1, 2, 3, 4],
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