Underscore prefix on property name? [duplicate]

by

The use of an underscore for ivar names is a convention first used by Apple to differentiate between an actual ivar and a property. Many people have since adopted this convention.

The reason this is done is to prevent the mistake of assigning a new value to an ivar instead of to the actual setter:

myIvar = newValue;

instead of

self.myIvar = myValue;

If you accidentally use the top example, you could cause a memory leak. The underscore prevents you from making that mistake.

More Related Contents:

  1. How to convert an NSString to id or UIView objective-c iphone [closed]
  2. How does an underscore in front of a variable in a cocoa objective-c class work?
  3. How does the new automatic reference counting mechanism work?
  4. Having trouble adding objects to NSMutableArray in Objective C
  5. How do I add 1 day to an NSDate?
  6. File write with [NSBundle mainBundle] fails
  7. How do I parse JSON with Objective-C?
  8. What’s the best way to develop a sideswipe menu like the one in Facebook’s new iOS app?
  9. setValue:forUndefinedKey: this class is not key value coding-compliant for the key [duplicate]
  10. @synthesize vs @dynamic, what are the differences?
  11. Managing multiple asynchronous NSURLConnection connections
  12. Phone number formatting on iOS
  13. Supporting Open In… menu item in my app for iOS Mail And Safari
  14. iOS – Merging two images of different size
  15. What does @synchronized() do as a singleton method in objective C?
  16. Is it possible to change a UIButtons background color?
  17. If “a == b” is false when comparing two NSString objects
  18. How can I have a UIBarButtonItem with both image and text?
  19. How to create Multiple Themes/Skins for iphone apps? [closed]
  20. Localizing the Cut|Copy|Paste menu on iOS
  21. Calling sleep(5); and updating text field not working
  22. RootViewController Switch Transition Animation
  23. Custom nav bar styling – iOS [duplicate]
  24. Is there a way to remove the separator line from a UITableView?
  25. Attempt to present * on * whose view is not in the window hierarchy
  26. Responding to touchesBegan in UIPickerView instead of UIView
  27. Property ” not found on object of type ‘id’
  28. NSPrivateQueueConcurrencyType Not saving properly
  29. Class method equivalent of -respondsToSelector:
  30. Objective-C Difference between setting nil and releasing

Leave a Comment