将unichar转换为String？

Question

我从unichar的实例方法NSString返回characterAtIndex(Int)类型，我想将其与Swift类型String进行比较。有一个简单的方法吗？

var str = "#ffffff"
var unichar = (str as NSString).characterAtIndex(0)
var unicharString = // Perform magic
var containsHash = unicharString == "#" // Should return `true`

由于

Answer 1

使用UnicodeScalar将unichar转换为String或Character（String的元素）。

var str = "#ffffff"
var unichar = (str as NSString).characterAtIndex(0)
var unicharString = Character(UnicodeScalar(unichar))
var containsHash = unicharString == "#"

• unichar是UInt16（typealias unichar = UInt16）的别名。
• UnicodeScalar有init(_ v: UInt16)。
• 字符（字符串元素）有init(_ scalar: UnicodeScalar)。

注意：字符串也有init(count: Int, repeatedValue c: UnicodeScalar)，但这不适合这种情况。

Answer 2

var str:String = "#ffffff"
var unichar = str[str.startIndex]
var unicharString = "\(unichar)"
var containsHash = unicharString == "#"