// 每個(gè)類(lèi)當(dāng)中只能有一個(gè)反初始化器袭景。反初始化器不接收任何形式參數(shù)圆雁，并且不需要寫(xiě)圓括號(hào)：(dealloc)
// 每個(gè)實(shí)例對(duì)象銷(xiāo)毀的時(shí)候都會(huì)調(diào)用此方法
deinit {
// perform the deinitialization
}
// eg:
class Bank {
static var coinsInBank = 10_000
static func distribute(coins numberOfCoinsRequested: Int) -> Int {
let numberOfCoinsToVend = min(numberOfCoinsRequested, coinsInBank)
coinsInBank -= numberOfCoinsToVend
return numberOfCoinsToVend
}
static func receive(coins: Int) {
coinsInBank += coins
}
}
class Player {
var coinsInPurse: Int
init(coins: Int) {
coinsInPurse = Bank.distribute(coins: coins)
}
func win(coins: Int) {
coinsInPurse += Bank.distribute(coins: coins)
}
deinit {
Bank.receive(coins: coinsInPurse)
}
}
//useing
var playerOne: Player? = Player(coins: 100)
print("A new player has joined the game with \(playerOne!.coinsInPurse) coins")
// Prints "A new player has joined the game with 100 coins"
print("There are now \(Bank.coinsInBank) coins left in the bank")
// Prints "There are now 9900 coins left in the bank"
playerOne!.win(coins: 2_000)
print("PlayerOne won 2000 coins & now has \(playerOne!.coinsInPurse) coins")
// Prints "PlayerOne won 2000 coins & now has 2100 coins"
print("The bank now only has \(Bank.coinsInBank) coins left")
// Prints "The bank now only has 7900 coins left"
playerOne = nil
print("PlayerOne has left the game")
// prints "PlayerOne has left the game"
print("The bank now has \(Bank.coinsInBank) coins")
// prints "The bank now has 10000 coins"
