我试图弄清楚如何在Swift中将Int转换为字符串。
我想出了一个解决方案，使用NSNumber，但我想弄清楚如何在Swift中做到这一切。
let x : Int = 45
let xNSNumber = x as NSNumber
let xString : String = xNSNumber.stringValue
当前回答
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
}
}
}
}
其他回答
我正在使用这个简单的方法
字符串到Int:
var a = Int()
var string1 = String("1")
a = string1.toInt()
和从Int到String:
var a = Int()
a = 1
var string1 = String()
string1= "\(a)"
在swift 3.0中，这就是我们如何将Int转换为字符串和字符串转换为Int
//convert Integer to String in Swift 3.0
let theIntegerValue :Int = 123 // this can be var also
let theStringValue :String = String(theIntegerValue)
//convert String to Integere in Swift 3.0
let stringValue : String = "123"
let integerValue : Int = Int(stringValue)!
let intAsString = 45.description // "45"
let stringAsInt = Int("45") // 45
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。
let Str = "12"
let num: Int = 0
num = Int (str)
