字符串格式化
Swift 使用\(item)
的形式迚行字符串格式化:
let apples = 3
let oranges = 5
let appleSummary = "I have \(apples) apples. by sollyu"
let appleSummary = "I have \(apples + oranges) pieces of fruit."
数组和字典
Swift 使用[]
操作符声明数组
(array)和字典
(dictionary):
var shoppingList = ["catfish", "water", "tulips", "blue paint"]
shoppingList[1] = "bottle of water"
var occupations = [
"MyBBS": "http://bbs.swift8.org",
"Kaylee": "Mechanic",
]
occupations["MyBlog"] = "http://172.16.40.140:8081"
一般使用初始化器(initializer)语法创建空数组
和空字典
:
let emptyArray = String[]()
let emptyDictionary = Dictionary<String, Float>()
如果类型信息已知,则可以使用[]声明空数组,使用[:]
声明空字典
。