How to Encode a Url in Swift

Swift - encode URL

Swift 3

In Swift 3 there is addingPercentEncoding

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

Output:

test%2Ftest

Swift 1

In iOS 7 and above there is stringByAddingPercentEncodingWithAllowedCharacters

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

Output:

test%2Ftest

The following are useful (inverted) character sets:

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

If you want a different set of characters to be escaped create a set:

Example with added "=" character:

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

Output:

test%2Ftest%3D42

Example to verify ascii characters not in the set:

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

How can I encode a URL to pass Percent (%) sign in Swift?

Looks like you're trying to use the Wind Toolkit Data API.

In one of their example requests, they have a query parameter that they show looks like this:

wkt=POINT(-104.23828125%2039.90973623453719)

That %20 is really just a URL-encoded space character.

(It is kind of confusing how they show a URL-encoded value for the wkt parameter, but not for other parameters whose values contain spaces like full_name=Sample User or affiliation=Test Organization, so it's understandable where the confusion comes from.)

Anyway, to fix the problem, just replace the % character in your wktStr with a space:

let wktStr: String = "POINT("+formattedX+" "+formattedY+")"

URL Encoding of String accepting all special characters in swift

Thank you @MartinR and @benleggiero for : How do I URL encode a string

It helped a lot.

It was not including all special characters.

Checked one by one and added those which were missing as below:

extension CharacterSet {

    public static let urlQueryParameterAllowed = CharacterSet.urlQueryAllowed.subtracting(CharacterSet(charactersIn: "&?~!$*(.,)_-+':"))

    public static let urlQueryDenied           = CharacterSet.urlQueryAllowed.inverted()
    public static let urlQueryKeyValueDenied   = CharacterSet.urlQueryParameterAllowed.inverted()
    public static let urlPathDenied            = CharacterSet.urlPathAllowed.inverted()
    public static let urlFragmentDenied        = CharacterSet.urlFragmentAllowed.inverted()
    public static let urlHostDenied            = CharacterSet.urlHostAllowed.inverted()

    public static let urlDenied                = CharacterSet.urlQueryDenied
        .union(.urlQueryKeyValueDenied)
        .union(.urlPathDenied)
        .union(.urlFragmentDenied)
        .union(.urlHostDenied)


    public func inverted() -> CharacterSet {
        var copy = self
        copy.invert()
        return copy
    }
}

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