If “a == b” is false when comparing two NSString objects

by

You’re assuming that the C == operator does string equality. It doesn’t. It does pointer equality (when called on pointers). If you want to do a real string equality test you need to use the -isEqual: method (or the specialization -isEqualToString: when you know both objects are strings):

if ([mySecondString isEqualToString:myString]) {
    i = 9;
}

More Related Contents:

  1. Understanding NSString comparison
  2. +[NSString stringWithString:] — what’s the point?
  3. @class vs. #import
  4. NSString property: copy or retain?
  5. How to print out the method name and line number and conditionally disable NSLog?
  6. How to Check if an NSDate occurs between two other NSDates
  7. Converting a string to an NSDate
  8. Deep copying an NSArray
  9. Check that a input to UITextField is numeric only
  10. Number of occurrences of a substring in an NSString?
  11. @synthesize vs @dynamic, what are the differences?
  12. How to find out who called a method?
  13. Comparing Strings in Cocoa
  14. self.variable and variable difference [duplicate]
  15. Is there a way to suppress warnings in Xcode?
  16. Sorting two NSArrays together side by side
  17. Search through NSString using Regular Expression
  18. Difference between NSString literals
  19. NSString: isEqual vs. isEqualToString
  20. Avoiding “NSArray was mutated while being enumerated”
  21. With ARC, what’s better: alloc or autorelease initializers?
  22. 2D arrays using NSMutableArray
  23. Reverse NSString text
  24. Removing duplicates from NSMutableArray
  25. Call instance method from class method
  26. How to get substring of NSString?
  27. NSString instance reports its class as NSCFString
  28. What’s the difference between [NSNull null] and nil?
  29. Class method equivalent of -respondsToSelector:
  30. How to get the width of an NSString?

Leave a Comment