Encode a URL with “#” 網址Encode特殊字元不轉換

(url, addingPercentEncoding, Reserved Special characters)

在網址中有些字元有特殊的符號，需要轉換可以參考下方網址

URL 出現特殊字元&中文字轉換

如果只透過addingPercentEncoding的urlQueryAllowed處理，
全部特殊符號都會被轉換，包含#（如下圖）

但如果url需要同時轉換特殊符號，又要保留有意義的特殊字元
可以參考本文

相關文章

URL 出現特殊字元&中文字轉換

Encode a URL with space in Swift

在轉換的條件，額外設定排外的特殊符號

var allowedCharacterSet = CharacterSet.urlQueryAllowed
 allowedCharacterSet.insert("#")
 
 guard let webURL = url?.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet as CharacterSet) else {
 return url
 }

加removingPercentEncoding避免重複encoding

var allowedCharacterSet = CharacterSet.urlQueryAllowed
 allowedCharacterSet.insert("#")
 
 guard let webURL = url?.removingPercentEncoding?.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet as CharacterSet) else {
 return url
 }

結果如下

番外篇

在轉換的條件，額外設定須轉換的特殊符號

var allowedCharacterSet = CharacterSet.urlQueryAllowed
 allowedCharacterSet.remove("+")
 
 guard let webURL = url?.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet as CharacterSet) else {
 return url
 }

加removingPercentEncoding避免重複encoding

var allowedCharacterSet = CharacterSet.urlQueryAllowed
 allowedCharacterSet.remove("+")
 
 guard let webURL = url?.removingPercentEncoding?.addingPercentEncoding(withAllowedCharacters: allowedCharacterSet as CharacterSet) else {
 return url
 }

CharacterSet的url轉換很詭異….
該轉的沒轉，不該轉的也轉
強制轉大寫頭疼 = =