This might works for you.
Code:
NSRange range = [theString rangeOfString:@">"];
NSString *coordinate = [theString substringWithRange:NSMakeRange(1, range.location-1)];
NSArray *coordinateValues = [coordinate componentsSeparatedByString:@","];
NSString *xValue = [coordinateValues objectAtIndex:0];
NSString *yValue = [coordinateValues objectAtIndex:1];