Character occurrences in a String Objective C

Question

How can I count the occurrence of a character in a string?

Example

String: 123-456-7890

I want to find the occurrence count of \"-\

Answer 1

int total = 0;
NSString *str = @"123-456-7890";
for(int i=0; i<[str length];i++)
{
    unichar c = [str characterAtIndex:i];
    if (![[NSCharacterSet alphanumericCharacterSet] characterIsMember:c])
    {
        NSLog(@"%c",c);
        total++;
    }
}
NSLog(@"%d",total);

this worked. hope it helps. happy coding :)