URL return nil and urlhash processing

In project practice , Find out URL In some system versions (14.7.1) Returns the nil（ Even if there is no Chinese ）, So it's using URL It is best to code as follows ：

Before we know this, we should know url in #(hash) The meaning of

Swift3 Before ：

url.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)

Swift3：

// code 
url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)

// decode 
url.removingPercentEncoding

Yes String Expand ：

extension String{
    
	public func toURL()->URL?{
    
	 // If url with hash Do not deal with 
     let range = range(of: "/#/")
     if range != nil{
    
        let Url = URL(string: self)
        return Url
     }
    	    
   	let eurl = addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
    if eurl != nil{
    
    	let Url = URL(string: eurl!)
        return Url
    }
    return nil
 }
}