在UI中将UInt32（UTF-32）转换为String

Question

我有一组UInt32值。我想将此数组转换为String。

这不起作用：

let myUInt32Array: [UInt32] = [72, 101, 108, 108, 111, 128049]
let myString = String(myUInt32Array) // error
let myString = String(stringInterpolationSegment: myUInt32Array) // [72, 101, 108, 108, 111, 128049] (not what I want)

这些SO帖子显示UTF8和UTF16：

• How can I create a String from UTF8 in Swift?
• Is there a way to create a String from utf16 array in swift?

Answer 1

UnicodeScalar是UInt32的类型别名。然后将UInt32值转换为UnicodeScalar，然后将其附加到String。

let myUInt32Array: [UInt32] = [72, 101, 108, 108, 111, 128049]

var myString: String = ""

for value in myUInt32Array {
    if let scalar = UnicodeScalar(value) {
        myString.append(Character(scalar))
    }
}

print(myString) // Hello