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自分のアプリでカスタムキーボードを使われないように制限する

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ごくまれにやりたいケースがあると思います。
UIApplicationDelegateの実装、例えばAppDelegateで以下の実装することで可能のようです。

- (BOOL)application:(UIApplication *)application shouldAllowExtensionPointIdentifier:(NSString *)extensionPointIdentifier {
    if([extensionPointIdentifier isEqualToString: UIApplicationKeyboardExtensionPointIdentifier]) {
        return NO;
    }
    return YES;
}
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