iOS---stringByAddingPercentEscapesUsingEncoding:' is deprecated: first deprecated in iOS 9.0

   

旧方法

 NSString *encoded = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    

iOS9  之后的   新方法

//    NSString *encoded = [url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

//      [NSCharacterSet URLQueryAllowedCharacterSet];