当我尝试像这样列出 NSCharacterSet 中的字符时
print(NSCharacterSet.URLQueryAllowedCharacterSet())
它不会打印出字符,而是打印出类似的内容
<__nscfcharacterset>
基于另一个答案,这是 Swift 2.0/3.0 中派生的更干净的版本:
extension NSCharacterSet {
var characters:[String] {
var chars = [String]()
for plane:UInt8 in 0...16 {
if self.hasMemberInPlane(plane) {
let p0 = UInt32(plane) << 16
let p1 = (UInt32(plane) + 1) << 16
for c:UTF32Char in p0..<p1 {
if self.longCharacterIsMember(c) {
var c1 = c.littleEndian
let s = NSString(bytes: &c1, length: 4, encoding: String.Encoding.utf32LittleEndian.rawValue)!
chars.append(String(s))
}
}
}
}
return chars
}
}
Usage:
let charset = NSCharacterSet.URLQueryAllowedCharacterSet()
print(charset.characters.joinWithSeparator(""))
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