在Swift 3.0中:

var value: Int = 10
var string = String(describing: value)

将Int转换为字符串:

let x : Int = 42
var myString = String(x)

而反过来-将String转换为Int:

let myString : String = "42"
let x: Int? = myString.toInt()

if (x != nil) {
    // Successfully converted String to Int
}

如果你使用的是Swift 2或Swift 3:

let x: Int? = Int(myString)

这里有4种方法:

var x = 34
var s = String(x)
var ss = "\(x)"
var sss = toString(x)
var ssss = x.description

我可以想象有些人会有一个问题与ss。但如果你正在寻找一个包含其他内容的字符串，那么为什么不呢。

为了在将来节省你的时间和麻烦，你可以做一个Int扩展。通常我会创建一个共享代码文件，在其中放置扩展名、枚举和其他有趣的东西。下面是扩展代码的样子:

extension Int
{
    func toString() -> String
    {
        var myString = String(self)
        return myString
    }
}

之后，当你想将int型转换为字符串时，你可以这样做:

var myNumber = 0
var myNumberAsString = myNumber.toString()

弦乐演奏

稍微讲讲性能 UI测试包在iPhone 7(真实设备)与iOS 14

let i = 0
lt result1 = String(i) //0.56s 5890kB
lt result2 = "\(i)" //0.624s 5900kB
lt result3 = i.description //0.758s 5890kB

import XCTest

class ConvertIntToStringTests: XCTestCase {
    let count = 1_000_000
    
    func measureFunction(_ block: () -> Void) {
        let metrics: [XCTMetric] = [
            XCTClockMetric(),
            XCTMemoryMetric()
        ]
        let measureOptions = XCTMeasureOptions.default
        measureOptions.iterationCount = 5
        
        measure(metrics: metrics, options: measureOptions) {
            block()
        }
    }

    func testIntToStringConstructor() {
        var result = ""
        measureFunction {
            for i in 0...count {
                result += String(i)
            }
        }
    }
    
    func testIntToStringInterpolation() {
        var result = ""
        measureFunction {
            for i in 0...count {
                result += "\(i)"
            }
        }
    }
    
    func testIntToStringDescription() {
        var result = ""
        measureFunction {
            for i in 0...count {
                result += i.description
            }
        }
    }
}

检查下面的答案:

let x : Int = 45
var stringValue = "\(x)"
print(stringValue)