回答編集履歴
1
修正
answer
CHANGED
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@@ -11,7 +11,9 @@
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11
11
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12
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```swift
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13
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func callViewController(index: Int) -> UIViewController {
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14
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-
let VC = self.childViewControllers[index]
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14
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+
guard let VC = self.childViewControllers[index] as? ViewController else {
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15
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fatalError()
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16
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}
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return VC
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}
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```
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