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Swift數(shù)組詳細(xì)用法解析

更新時(shí)間：2016年11月01日 12:18:32 作者：追到夢(mèng)的魔術(shù)師

這篇文章主要為大家詳細(xì)介紹了Swift數(shù)組詳細(xì)用法,具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

一、說(shuō)明

Swift數(shù)組中的類型必須一致，這一點(diǎn)與OC不同


// 數(shù)組初始化
var numbers = [0,1,2,3,4,5]
var vowels = ["A","E","I","O","U"]

// 數(shù)組的類型： [Int] 或者 Array<Int>
//var numbers: [Int] = [0,1,2,3,4,5]
//var numbers: Array<Int> = [0,1,2,3,4,5]

// 空數(shù)組
var emptyArray1:[Int] = []
var emptyArray2:Array<Int> = []
var emptyArray3 = [Int]()
var emptyArray4 = Array<Int>()

// 創(chuàng)建具有默認(rèn)值的數(shù)組(相同元素的數(shù)組)
var allZeros = Array<Int>(repeating: 0, count: 5)
//[0,0,0,0,0]
var allZeros2 = [Int](repeating: 0, count: 5)
//[0,0,0,0,0]

二、常用方法

var numbers = [1,2,3,4,5]
var vowels = ["A","E","I","O","U"]
var emptyArray = [Int]()


// 數(shù)組長(zhǎng)度
vowels.count


// 判空
numbers.isEmpty
emptyArray.isEmpty


// 獲取元素
vowels[2]
// 數(shù)組越界是一個(gè)嚴(yán)重的錯(cuò)誤
//vowels[-1]
//vowels[5]


// 獲取第一個(gè)元素和最后一個(gè)元素，返回的是可選型
vowels.first 
vowels.last  //.first和.last的返回值都為可選型
emptyArray.first

if let firstVowel = vowels.first{
  print("The first vowel is " + firstVowel)
}

vowels.first!

vowels[vowels.count-1]

// 獲取最小，最大值
numbers.min() //1
vowels.max() //U


// 使用范圍
numbers[2..<4] //[3,4]
numbers[2..<numbers.count] //[3,4,5]


// 包含
vowels.contains("A")
vowels.contains("B")

let letter = "A"
if vowels.contains( letter ){
  print("\(letter) is a vowel")
}
else{
  print("\(letter) is not a vowel")
}


vowels.index(of: "E") //獲取索引，返回值為可選型

if let index = vowels.index(of: "E"){
  print("E is a vowel in position \(index+1).")
}
else{
  print("E is not a vowel.")
}


// 遍歷
for index in 0..<numbers.count{
  numbers[index]
}

for number in numbers{
  print(number)
}

for (index, vowel) in vowels.enumerated(){
  //遍歷數(shù)組索引和元素
  print("\(index+1): \(vowel)")
}


// 比較
var oneToFive = [1,2,3,4,5]
numbers == oneToFive //true

var oneToFive2 = [1,2,4,3,5]
numbers == oneToFive //true

//swift 3.0之前數(shù)組是有序的數(shù)據(jù)集合，swift 3.0后為無(wú)序

三、更多操作

var courses = ["A","B","C"]

// 添加元素
courses.append("D") //["A","B","C","D"]
print(courses)

// 數(shù)組常量
//使用let定義的數(shù)組不可以更改任何內(nèi)容

courses += ["E"] //+=后面必須和前面的類型一致 //["A","B","C","D","E"]
print(courses)

// 兩個(gè)數(shù)組相加
courses = courses + ["F","G"] //+后面必須是數(shù)組
//["A","B","C","D","E","F","G"]
print(courses)

courses.insert("Q", at: 5) 
//["A", "B", "C", "D", "E", "Q", "F", "G"]
print(courses)


// 刪除元素
courses.removeLast()
//["A", "B", "C", "D", "E", "Q", "F"]
print(courses)

courses.removeFirst()
//["B", "C", "D", "E", "Q", "F"]
print(courses)

courses.remove(at: 4)
//["B", "C", "D", "E", "F"]
//courses.removeAtIndex(10)
print(courses)


//區(qū)間刪除操作
//courses.removeRange(0..<4)
//courses.removeRange(0..<10)
//print(courses)

//courses.removeAll()
//print(courses)


// 修改元素
courses[0] = "W"
//["W", "C", "D", "E", "F"]
print(courses)
//范圍修改
courses[1...3] = ["W","W","W"]
//["W", "W", "W", "W", "F"]
print(courses)

courses[0...3] = ["W"]
//["W", "F"]
print(courses)

四、二維數(shù)組

var board = [ [1024,16,2,0] , [256,4,2,0] , [64,2,0,0] , [2,0,0,0] ]
//var board:[[Int]] = [ [1024,16,2,0] , [256,4,2,0] , [64,2,0,0] , [2,0,0,0] ]
//var board:[Array<Int>] = = [ [1024,16,2,0] , [256,4,2,0] , [64,2,0,0] , [2,0,0,0] ]
//var board:Array<[Int]> = [ [1024,16,2,0] , [256,4,2,0] , [64,2,0,0] , [2,0,0,0] ]
//var board:Array<Array<Int>> = [ [1024,16,2,0] , [256,4,2,0] , [64,2,0,0] , [2,0,0,0] ]


// 二維數(shù)組獲取元素
board[0]
board[0][0]


// 獲取二維數(shù)組兩個(gè)維度的信息
board.count
board[0].count


// Swift中的二維數(shù)組，每一維度的元素?cái)?shù)目可以不同
board[0].append(0)
board


// 為二維數(shù)組的第一個(gè)維度添加的元素是一個(gè)數(shù)組
board.append([0,0,0,0])
board += [ [0,0,0,0] ]
board

五、NSArray

NSArray是一個(gè)類，Array是一個(gè)結(jié)構(gòu)體

var array1 = [] //會(huì)默認(rèn)是NSArray,swift3.0之后該寫(xiě)法廢除

var array2 = [1,2,3,4,5] as NSArray

var array3: NSArray = [1,"hello"]

var array4: [NSObject] = [1 as NSObject,"hello" as NSObject]

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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