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@hanoopy

メソッドに任意で外部引数名を設定できる

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なんとなくSwiftを使っていたら、メソッドの引数でラベルを使うやつが出てきた。

presentViewController(myAlert, animated: true, completion: nil)

とか。
これはメソッドの定義時にラベルを設定している。

func presentViewController(viewControllerToPresent: UIViewController, animated flag: Bool, completion: (() -> Void)?)

func(ラベル 引数名:型)という指定ができる。
func(ラベル 引数名:型)が、呼び出し時にfunc(ラベル:変数名)という形になるので知らないと混乱する。


こちらの説明がわかりやすい。
Swiftにおける名前付き引数


公式本の「The Swift Programming Language」だと、239ページ目の「External Parameter Names」
こちらの説明もまたわかりやすい。

Apple本

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hanoopy
PHPプログラマー。 iPhone開発勉強中。

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