Convert emoji to hex value using Swift

问题

I'm trying to convert emojis in hex values, I found some code online to do it but it's only working using Objective C, how to do the same with Swift?

回答1:

This is a "pure Swift" method, without using Foundation:

let smiley = "😊"

let uni = smiley.unicodeScalars // Unicode scalar values of the string
let unicode = uni[uni.startIndex].value // First element as an UInt32

print(String(unicode, radix: 16, uppercase: true))
// Output: 1F60A

Note that a Swift Character represents a "Unicode grapheme cluster" (compare Strings in Swift 2 from the Swift blog) which can consist of several "Unicode scalar values". Taking the example from @TomSawyer's comment below:

let zero = "0️⃣"

let uni = zero.unicodeScalars // Unicode scalar values of the string
let unicodes = uni.map { $0.value }

print(unicodes.map { String($0, radix: 16, uppercase: true) } )
// Output: ["30", "FE0F", "20E3"]

回答2:

If some one trying to found a way to convert Emoji To Unicode string

extension String {

  func decode() -> String {
      let data = self.data(using: .utf8)!
      return String(data: data, encoding: .nonLossyASCII) ?? self
  }

  func encode() -> String {
      let data = self.data(using: .nonLossyASCII, allowLossyConversion: true)!
      return String(data: data, encoding: .utf8)!
  }
}

Example:

"😍".encode()

RESULT: \ud83d\ude0d

"\ud83d\ude0d".decode()

RESULT: 😍

回答3:

It works similarly but pay attention when you're printing it:

import Foundation

var smiley = "😊"
var data: NSData = smiley.dataUsingEncoding(NSUTF32LittleEndianStringEncoding, allowLossyConversion: false)!
var unicode:UInt32 = UInt32()
data.getBytes(&unicode)
// println(unicode) // Prints the decimal value
println(NSString(format:"%2X", unicode)) // Print the hex value of the smiley

来源：https://stackoverflow.com/questions/27277856/convert-emoji-to-hex-value-using-swift

标签

swift

hex

emoji