Given an array of strings that represent unicode code points:
let arr : [String] = ["0023", "FE0F", "20E3"]
How can I dynamically convert this into a swift string? Statically, I have found I can write:
let str = "\u{0023}\u{FE0F}\u{20E3}"
However, I would like to do this dynamically as each array will represent some sequence of code points. In the above example, the output would be #️⃣
You can convert each of your hexa string to UInt32, initialise an Unicode.Scalar for each element and create a String UnicodeScalarView from it:
let arr = ["0023", "FE0F", "20E3"]
let values = arr.compactMap{ UInt32($0, radix: 16) }
let unicodeScalars = values.compactMap(Unicode.Scalar.init)
let string = String(String.UnicodeScalarView(unicodeScalars))
Which can be also be written as a one liner:
let arr = ["0023", "FE0F", "20E3"]
let string = String(String.UnicodeScalarView(arr.compactMap{ UInt32($0, radix: 16) }.compactMap(Unicode.Scalar.init)))
edit/update:
If all your strings can be represented by UInt16 values you can also use String initializer init(utf16CodeUnits: UnsafePointer<unichar>, count: Int)as shown by @MartinR here:
let arr = ["0023", "FE0F", "20E3"]
let values = arr.compactMap { UInt16($0, radix: 16) }
let string = String(utf16CodeUnits: values, count: values.count) // "#️⃣"