xcode - 如何用 Swift 字符串中的描述替换表情符号字符

Question

我正在寻找一种方法来用 Swift 字符串中的描述替换表情符号字符。

例子:

Input "This is my string 😄"

我想替换 😄 得到:

Output "This is my string {SMILING FACE WITH OPEN MOUTH AND SMILING EYES}"

到目前为止，我使用的是从 this answer by MartinR 的原始代码修改而来的代码, 但只有当我处理单个字符时它才有效。

let myCharacter : Character = "😄"
let cfstr = NSMutableString(string: String(myCharacter)) as CFMutableString
var range = CFRangeMake(0, CFStringGetLength(cfstr))
CFStringTransform(cfstr, &range, kCFStringTransformToUnicodeName, Bool(0))
var newStr = "\(cfstr)"

// removing "\N"  from the result: \N{SMILING FACE WITH OPEN MOUTH AND SMILING EYES}
newStr = newStr.stringByReplacingOccurrencesOfString("\\N", withString:"")

print("\(newStr)") // {SMILING FACE WITH OPEN MOUTH AND SMILING EYES}

我怎样才能做到这一点？

Answer 1

首先不要使用 Character，而是使用 String 作为输入:

let cfstr = NSMutableString(string: "This 😄 is my string 😄") as CFMutableString

最终会输出

This {SMILING FACE WITH OPEN MOUTH AND SMILING EYES} is my string {SMILING FACE WITH OPEN MOUTH AND SMILING EYES}

放在一起:

func transformUnicode(input : String) -> String {
    let cfstr = NSMutableString(string: input) as CFMutableString
    var range = CFRangeMake(0, CFStringGetLength(cfstr))
    CFStringTransform(cfstr, &range, kCFStringTransformToUnicodeName, Bool(0))
    let newStr = "\(cfstr)"
    return newStr.stringByReplacingOccurrencesOfString("\\N", withString:"")
}

transformUnicode("This 😄 is my string 😄")