查看NSCharacterSet中的字符(快速) [英] See characters in an NSCharacterSet (Swift)

问题描述

当我试图像这样在NSCharacterSet中列出字符时

When I'm trying to list characters in an NSCharacterSet like this

print(NSCharacterSet.URLQueryAllowedCharacterSet())

它不会打印出字符，而是类似于

it doesn't print out the characters but rather something similar to

< __ NSCFCharacterSet:0x1759b900>

<__NSCFCharacterSet: 0x1759b900>

推荐答案

基于另一个答案，这是派生的Swift 2.0/3.0中更清洁的版本:

Based on another answer, here is a derived cleaner version in Swift 2.0/3.0:

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: NSUTF32LittleEndianStringEncoding)!
                        chars.append(String(s))
                    }
                }
            }
        }
        return chars
    }
}

用法:

let charset = NSCharacterSet.URLQueryAllowedCharacterSet()
print(charset.characters.joinWithSeparator(""))

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