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iphonensstringnsmutablestring

NSString may not respond to append string

I have a NSMutableString and I am trying to use appendString method. Though it works fine but every time I use it, I receive a warning NSString may not respond to append string. This is my code : 

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{

    [soapResults appendString: string];        //soapResults is an NSMutableString in .h
}

I know I am getting this warning because of NSString string but how to remove this warning?

Solution 
  • self.soapResults=(NSMutableString *)[self.soapResults stringByAppendingString:string];

or

soapResults=(NSMutableString *)[soapResults stringByAppendingString:string];

    OR

    self.soapResults=(NSMutableString *)[[self.soapResults stringByAppendingString:string] mutableCopy];

    //    or

soapResults=(NSMutableString *)[[soapResults stringByAppendingString:string] mutableCopy];