Swift3.0 数组

数组以有序的方式来储存相同类型的值。相同类型的值可以在数组的不同地方多次出现。

//创建空数组

//Swift创建数组一定要制定存放的元素类型

let arr1 = [Int]()

var arr2 = [String]()

//添加元素

arr2.append("we are family")

print(arr2)

//修改，数组下标从0开始

arr2[0]="lisi"

print(arr2)

//字面量创建数组

var arr3 = ["zhangsan","lisi","wanger","mazi"]

print(arr3)

//删除

//根据下标删除

arr3.remove(at: 0)

print(arr3)

//删除数组最后一个元素

arr3.removeLast()

print(arr3)

//删除数组第一个元素

arr3.removeFirst()

print(arr3)

//删除数组全部元素

arr3.removeAll()

print(arr3)

//数组的遍历//获取数组元素个数

var arr4 = ["huaqiangu","shaqianmo","dongfangyuqing","tangbao","zunshang"]

for item in arr4 {

print(item)

}

for (i,Item) in arr4.enumerated() {

print("item:\(Item) index:\(i)")

}

//数组排序

arr4.sort()

print(arr4)

var numArr = [8,9,3,7,1,5]

print(arr3.count)

//冒泡排序

//外层控制趟数，内层控制每趟的比较次数

for i in 0..numArr[x+1] {

let temp = numArr[x]

numArr[x] = numArr[x+1]

numArr[x+1] = temp

}

*/

}

}

print(numArr)

//数组元素的插入

var arr5 = ["a","b","c","d"]

//下表值要小于等于数组元素个数

arr5.insert("f", at: 4)

print(arr5)