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
将String转换为Int
var numberA = Int("10")
Print(numberA) // It will print 10
将Int转换为String
var numberA = 10
1日)
print("numberA is \(numberA)") // It will print 10
2)
var strSomeNumber = String(numberA)
or
var strSomeNumber = "\(numberA)"
斯威夫特2:
var num1 = 4
var numString = "56"
var sum2 = String(num1) + numString
var sum3 = Int(numString)
斯威夫特4:
试图在label中显示没有Optional()字的值。
这里x是一个Int值使用。
let str:String = String(x ?? 0)
为了完整起见，你还可以使用:
let x = 10.description
或支持描述的任何其他值。
let Str = "12"
let num: Int = 0
num = Int (str)
