将unichar转换为String？

Question

我得到了一个unichar从NSString实例方法返回的类型characterAtIndex(Int),我想将它与Swift类型进行比较String.是否有捷径可寻？

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

谢谢

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(String的元素)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 == "#"