How to find Each character count in a given String Objective C...

The below method is used to find Each different characters count in a given string, You can see the Result in console...

You call this method Wherever you want like,   [self charactersCount];

-(void) charactersCount  {

    

    NSString *mainString =[[NSMutableString alloc]initWithString:@"ttthhhryyyddmrrr"];

    

    for (int i=0; i<[mainString length]; i++) {

        unichar ch = [mainString characterAtIndex:i];

        int count=0;

        

        for (int j=0; j<[mainString length]; j++) {

            

            if (ch == [mainString characterAtIndex:j]) {

                count++;

            }

        }

        NSLog(@"Result: %C -----> %d",[mainString characterAtIndex:i],count);

        mainString= [mainString stringByReplacingOccurrencesOfString:[NSString stringWithCharacters:&ch length:1] withString:@""];

        i=i-1;

    }

}