iOS---stringByAddingPercentEscapesUsingEncoding:' is deprecated: first deprecated in iOS 9.0 - Use -stringByAddingPercentEncodingWithAllowedCharacters: instead,

旧方法

NSString *encoded = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

iOS9  之后的   新方法

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

//      [NSCharacterSet URLQueryAllowedCharacterSet];