如果你有字符串数组列表，那么转换为Int

let arrayList = list.map { Int($0)!} 
     arrayList.description

它会给你字符串值

可以使用print函数打印任何对象

或者使用\(name)将任何对象转换为字符串。

例子:

let array = [1,2,3,4]

print(array) // prints "[1,2,3,4]"

let string = "\(array)" // string == "[1,2,3,4]"
print(string) // prints "[1,2,3,4]"

使用Swift 5，根据您的需要，您可以选择以下Playground示例代码之一来解决您的问题。

将字符数组转换为不带分隔符的字符串:

let characterArray: [Character] = ["J", "o", "h", "n"]
let string = String(characterArray)

print(string)
// prints "John"

将String数组转换为不带分隔符的String:

let stringArray = ["Bob", "Dan", "Bryan"]
let string = stringArray.joined(separator: "")

print(string) // prints: "BobDanBryan"

将字符串数组转换为单词之间带有分隔符的字符串:

let stringArray = ["Bob", "Dan", "Bryan"]
let string = stringArray.joined(separator: " ")

print(string) // prints: "Bob Dan Bryan"

将字符串数组转换为字符之间带有分隔符的字符串:

let stringArray = ["car", "bike", "boat"]
let characterArray = stringArray.flatMap { $0 }
let stringArray2 = characterArray.map { String($0) }
let string = stringArray2.joined(separator: ", ")

print(string) // prints: "c, a, r, b, i, k, e, b, o, a, t"

将float数组转换为数字之间带有分隔符的String:

let floatArray = [12, 14.6, 35]
let stringArray = floatArray.map { String($0) }
let string = stringArray.joined(separator: "-")

print(string)
// prints "12.0-14.6-35.0"

试试这个:

let categories = dictData?.value(forKeyPath: "listing_subcategories_id") as! NSMutableArray
                        let tempArray = NSMutableArray()
                        for dc in categories
                        {
                            let dictD = dc as? NSMutableDictionary
                            tempArray.add(dictD?.object(forKey: "subcategories_name") as! String)
                        }
                        let joinedString = tempArray.componentsJoined(by: ",")

我的工作在NSMutableArray与componentsJoinedByString

var array = ["1", "2", "3"]
let stringRepresentation = array.componentsJoinedByString("-") // "1-2-3"

斯威夫特3

["I Love","Swift"].joined(separator:" ") // previously joinWithSeparator(" ")