Swift-编码URL

在Swift 3中有

addingPercentEncoding

let originalString = "test/test"let escapedString = originalString.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)print(escapedString!)

输出：

测试％2Ftest

在iOS 7及更高版本中，

stringByAddingPercentEncodingWithAllowedCharacters

var originalString = "test/test"var escapedString = originalString.stringByAddingPercentEncodingWithAllowedCharacters(.URLHostAllowedCharacterSet())println("escapedString: (escapedString)")

输出：

测试％2Ftest

以下是有用的（倒置）字符集：

URLFragmentAllowedCharacterSet  "#%<>[]^`{|}URLHostAllowedCharacterSet      "#%/<>?@^`{|}URLPasswordAllowedCharacterSet  "#%/:<>?@[]^`{|}URLPathAllowedCharacterSet      "#%;<>?[]^`{|}URLQueryAllowedCharacterSet     "#%<>[]^`{|}URLUserAllowedCharacterSet      "#%/:<>?@[]^`

如果要转义其他字符集，请创建一个字符集：
添加了“ =”字符的示例：

var originalString = "test/test=42"var customAllowedSet =  NSCharacterSet(charactersInString:"="#%/<>?@\^`{|}").invertedSetvar escapedString = originalString.stringByAddingPercentEncodingWithAllowedCharacters(customAllowedSet)println("escapedString: (escapedString)")

输出：

测试％2Ftest％3D42

验证不在集合中的ASCII字符的示例：

func printCharactersInSet(set: NSCharacterSet) {    var characters = ""    let iSet = set.invertedSet    for i: UInt32 in 32..<127 {        let c = Character(UnipreScalar(i))        if iSet.longCharacterIsMember(i) { characters = characters + String(c)        }    }    print("characters not in set: '(characters)'")}