本文是學(xué)習(xí)《The Swift Programming Language》整理的相關(guān)隨筆煎源，基本的語(yǔ)法不作介紹色迂，主要介紹Swift中的一些特性或者與OC差異點(diǎn)。
系列文章：
- Swift4 基礎(chǔ)部分:The Basics
- Swift4 基礎(chǔ)部分:Basic Operators
- Swift4 基礎(chǔ)部分:Strings and Characters
- Swift4 基礎(chǔ)部分:Collection Types
- Swift4 基礎(chǔ)部分:Control Flow
- Swift4 基礎(chǔ)部分:Functions
- Swift4 基礎(chǔ)部分:Closures
- Swift4 基礎(chǔ)部分: Enumerations
- Swift4 基礎(chǔ)部分: Classes and Structures
- Swift4 基礎(chǔ)部分: Properties
- Swift4 基礎(chǔ)部分: Methods
- Swift4 基礎(chǔ)部分: Subscripts
- Swift4 基礎(chǔ)部分: Inheritance
- Swift4 基礎(chǔ)部分: Initialization
A deinitializer is called immediately before a class
instance is deallocated. You write deinitializers with the
deinit keyword, similar to how initializers are written
with the init keyword. Deinitializers are only available
on class types.
- 在一個(gè)類(lèi)的實(shí)例被釋放之前手销，析構(gòu)函數(shù)被立即調(diào)用脚草。用關(guān)鍵字deinit來(lái)標(biāo)示析構(gòu)函數(shù)，類(lèi)似于初始化函數(shù)用init來(lái)標(biāo)示原献。析構(gòu)函數(shù)只適用于類(lèi)類(lèi)型馏慨。
例子：
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);
}
}
var playerOne: Player? = Player(coins: 100);
print("A new player has joined the game with \(playerOne!.coinsInPurse) coins");
print("There are now \(Bank.coinsInBank) coins left in the bank");
playerOne!.win(coins: 2_000);
print("PlayerOne won 2000 coins & now has \(playerOne!.coinsInPurse) coins");
print("The bank now only has \(Bank.coinsInBank) coins left");
playerOne = nil;
print("PlayerOne has left the game")
print("The bank now only has \(Bank.coinsInBank) coins left");
執(zhí)行結(jié)果:
A new player has joined the game with 100 coins
There are now 9900 coins left in the bank
PlayerOne won 2000 coins & now has 2100 coins
The bank now only has 7900 coins left
PlayerOne has left the game
The bank now only has 10000 coins left
