Swift 数组

数组初始化

基本语法：

[value 1, value2, value 3]

var shoppingList: String[] = ["Eggs","Milk"]

数组追加元素

append 函数追加 或通过+操作符

var shoppingList: String[] = ["Eggs", "Milk"]

hoppingList.append("Flour")

shoppingList += ["Chocolate Spread",

"Cheese","Butter"]

println("The shopping list contains

\(shoppingList.count) items.")

数组插入元素

使用 insert 方法

var shoppingList: String[] = ["Eggs", "Milk"]

shoppingList.insert("Maple Syrup", atIndex:

0)

shoppingList += ["Chocolate Spread", "Cheese", "Butter"]

数组删除元素

使用 removeAtIndex 方法

var shoppingList: String[] = ["Eggs", "Milk"]let mapleSyrup = shoppingList.removeAtIndex(0)

数组长度

使用 count 属性。

println("The shopping list contains

\(shoppingList.count)items.")

数组遍历

1.遍历方法１

var shoppingList: String[] = ["Eggs", "Milk"]

for item in shoppingList {

println(item)

}

２.遍历方法２有循环变量

var shoppingList: String[] = ["Eggs", "Milk"]

for (index, value) in enumerate(shoppingList) {

println("Item \(index + 1): \(value)")

}

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