//: Playground - noun: a place where people can play
import UIKit
//这里是一个反初始化函数操作的例子。
struct Bank {
static var coinsInBank = 10_000
func vendCoins(var numberOfCoinsToVend: Int) -> Int {
numberOfCoinsToVend = min(numberOfCoinsToVend,coinsInBank)
coinsInBank -= numberOfCoinsToVend
return numberOfCoinsToVend
}
func receiveCoins(coins: Int) {
coinsInBank += coins
}
}
class Player {
var coinsInPurse: Int
init(coins: Int) {
coinsInPurse = Bank.vendCoins(coins)
}
func winCoins(coins: Int) {
coinsInPurse += Bank.vendCoins(coins)
}
deinit {
Bank.receiveCoins(coinsInPurse)
}
}
var playerOne: Player? = Player(coins: 100)
playerOne?.coinsInPurse
Bank.coinsInBank
playerOne?.winCoins(2_000)
playerOne?.coinsInPurse
Bank.coinsInBank
playerOne = nil
Bank.coinsInBank
原文链接：https://www.f2er.com/swift/326784.html