数组与字符串的互转, 以下为代码示例
数组转字符串
//字符串数组按元素拼接成字符串
let stringArray = ["1", "2", "3", "4"]
//不带参数方法
let resultString1 = stringArray.joined()
print(resultString1)
//打印结果:"1234"
//带参数方法, 用指定字符或字符串分隔而组成的结果字符串
let resultString2 = stringArray.joined(separator: ",")
print(resultString2)
//打印结果:"1,2,3,4"
字符串转数组
- 无分隔符方式
let string = "abcd"
//数组自带方法, 用字符串生成单字符组成的数组
let strArray1 = Array(string)
print(strArray1)
//打印结果:["a", "b", "c", "d"]
//字符串方法
let strArray2 = string.compactMap { (item) -> String in
return "\(item)"
}
print(strArray2)
//打印结果:["a", "b", "c", "d"]
- 有分隔符方式, 示例以字符串中字母"c"为分隔符分割整体字符串为数组
let splitString1 = "abccdabccdabcd"
//方法1: 如果字符串中存在两个相邻的分隔符, 则不保留空字符串
let splitArray1 = splitString1.split(separator: "c")
print(splitArray1)
//打印结果:["ab", "dab", "dab", "d"]
//方法2: 如果字符串中存在两个相邻的分隔符, 则保留空字符串
let splitString2 = "abccdabccdabcd"
let splitArray2 = splitString2.components(separatedBy: "c")
print(splitArray2)
//打印结果:["ab", "", "dab", "", "dab", "d"]
