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Swift コーディングスタイル
このファイルは common/coding-style.md を Swift 固有のコンテンツで拡張します。
フォーマット
- 自動フォーマットには SwiftFormat、スタイル強制には SwiftLint を使用する
- Xcode 16+ には代替として
swift-formatがバンドルされている
不変性
varよりもletを優先する — すべてをletで定義し、コンパイラが要求する場合にのみvarに変更する- デフォルトで値セマンティクスの
structを使用する。同一性や参照セマンティクスが必要な場合にのみclassを使用する
命名
Apple API デザインガイドライン に従う:
- 使用箇所での明確さ — 不要な単語を省く
- メソッドとプロパティは型ではなく役割にちなんだ名前を付ける
- グローバル定数よりも
static letを定数に使用する
エラーハンドリング
型付き throws(Swift 6+)とパターンマッチングを使用する:
func load(id: String) throws(LoadError) -> Item {
guard let data = try? read(from: path) else {
throw .fileNotFound(id)
}
return try decode(data)
}
並行性
Swift 6 の厳格な並行性チェックを有効にする。以下を優先する:
- 隔離境界をまたぐデータには
Sendable値型 - 共有ミュータブル状態にはアクター
- 非構造化
Task {}よりも構造化された並行性(async let、TaskGroup)