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お題は不問!Qiita Engineer Festa 2024で記事投稿!
Qiita Engineer Festa20242024年7月17日まで開催中!

【UE5】C++ の Tick 内でキー入力判定する方法のメモ

Last updated at Posted at 2024-06-26

はじめに

簡単な機能を試したいときなどに、自分でトリガーする手段としてキー入力で判定したかったのでそれのメモ。
今回は例として Y キーをアサインしているが、ここにあるものから自由にアサインできるので参考までに。
ここであげるコードは Tick メソッド内に実装して、動作確認している。

押した瞬間の 1 回のみを判定する

if (GetWorld()->GetFirstPlayerController()->WasInputKeyJustPressed(EKeys::Y)) {
    UE_LOG(LogTemp, Warning, TEXT("Y key is pressed"));
}

動作ログ

押した瞬間だけ反応し、長押ししようが関係なく 1 回のみ。

LogTemp: Warning: Y key is pressed

離した瞬間の 1 回のみを判定する

if (GetWorld()->GetFirstPlayerController()->WasInputKeyJustReleased(EKeys::Y)) {
    UE_LOG(LogTemp, Warning, TEXT("Y key is released"));
}

動作ログ

離した瞬間だけ反応し 1 回のみ。

LogTemp: Warning: Y key is released

押している間ずっと true 判定する

if (GetWorld()->GetFirstPlayerController()->IsInputKeyDown(EKeys::Y)) {
    UE_LOG(LogTemp, Warning, TEXT("Y key is pressed"));
}

動作ログ

押している間ずっと true 判定がでている。(Tick で回る周期で出力)
離した瞬間が分かりやすいように released も仕込んである

LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is pressed
LogTemp: Warning: Y key is released

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