Question

I want to do this:

while(theString (does not have) @"this string" (in it)) {
do something
}

Answer 1

From this stackoverflow post:

NSString *string = @"hello bla bla";
if ([string rangeOfString:@"bla"].location == NSNotFound) {
  NSLog(@"string does not contain bla");
} else {
  NSLog(@"string contains bla!");
}

The key is noticing that
rangeOfString: returns an NSRange
struct, and the documentation says
that it returns the struct
{NSNotFound, 0} if the “haystack” does
not contain the “needle”.