Created
April 22, 2016 03:55
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/* | |
列挙型と構造体 | |
*/ | |
// enumを使えば、列挙型を生成できます。クラスや独自型のように、列挙型もメソッドを持つことができます。 | |
enum Rank: Int { | |
case Ace = 1 | |
case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten | |
case Jack, Queen, King | |
func simpleDescription() -> String { | |
switch self { | |
case .Ace: | |
return "ace" | |
case .Jack: | |
return "jack" | |
case .Queen: | |
return "queen" | |
case .King: | |
return "king" | |
default: | |
return String(self.rawValue) | |
} | |
} | |
} | |
let ace = Rank.Ace | |
let aceRawValue = ace.rawValue | |
print(aceRawValue) // 1 | |
// ex: 2つのRankの値を比較する関数を作成する。 | |
func compareRanks(rank1 :Rank, rank2 :Rank) -> String { | |
if(rank1.rawValue > rank2.rawValue) { | |
return "rank1 is bigger!" | |
} else if(rank1.rawValue < rank2.rawValue) { | |
return "rank2 is bigger!" | |
} else { | |
return "both are same!" | |
} | |
} | |
let rankTwo = Rank.Two | |
let rankFour = Rank.Four | |
print(compareRanks(rankTwo, rank2: rankFour)) // rank2 is bigger! | |
// Switfでは、ゼロから始まる値がEnumのそれぞれの要素に割り当てられる。ただし、値を明示することもできる。 | |
// 上記の例では、Aceに1が割り当てられている。StringやFloat値を指定することも可能。 | |
// Enumの割り当てられた値にアクセスするには、rawValueプロパティを使う。 | |
// | |
if let convertedRank = Rank(rawValue: 3) { | |
let threeDescription = convertedRank.simpleDescription() | |
print(threeDescription) // 3 | |
} | |
// Enumの要素の名称と同じような値を設定することはあまり意味が無い。(ここ、きちんと英語を理解できてないかも) | |
enum Suit { | |
case Spades, Hearts, Diamonds, Clubs | |
func simpleDescription() -> String { | |
switch self { | |
case .Spades: | |
return "spades" | |
case .Hearts: | |
return "hearts" | |
case .Diamonds: | |
return "diamonds" | |
case .Clubs: | |
return "clubs" | |
} | |
} | |
} | |
let hearts = Suit.Hearts | |
let heartsDescription = hearts.simpleDescription() | |
print(heartsDescription) | |
// ex: 色を返すcolorメソッドを追加する。 | |
enum SuitWithColor { | |
case Spades, Hearts, Diamonds, Clubs | |
func color() -> String { | |
switch self { | |
case .Spades, .Clubs: | |
return "black" | |
case .Hearts, .Diamonds: | |
return "red" | |
} | |
} | |
} | |
let suitRed = SuitWithColor.Hearts | |
print(suitRed.color()) // red |
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