Bordertown Labs Blog
Notes from Bordertown Labs with posts regarding software development for the iPhone, Ruby on Rails, tips and code.
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Posts tagged "cocoa"
May 26th, 2010 @ 1:59 pm
Making an eyedropper
- How to get the RGB values for a pixel on an image on the iphone - Stack Overflow
- How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)? - Stack Overflow
- Getting the pixel data from a CGImage object - Apple
Dec 7th, 2009 @ 5:47 pm
CocoaDev: Debugging Techniques
Aug 18th, 2009 @ 4:11 pm
cheat cocoaerrors
Tired of looking up Cocoa errors all the time?
1. Install the Ruby gem named Cheat — http://cheat.errtheblog.com/
2. At a command line, type this:
cheat cocoaerrors
3. Look up your problem and get back to work
[wolfshorty:~] mark% cheat cocoaerrors
cocoaerrors:
Cocoa error codes related to validation.
NSManagedObjectValidationError = 1550,
NSValidationMultipleErrorsError = 1560,
NSValidationMissingMandatoryPropertyError = 1570,
NSValidationRelationshipLacksMinimumCountError = 1580,
NSValidationRelationshipExceedsMaximumCountError = 1590,
NSValidationRelationshipDeniedDeleteError = 1600,
NSValidationNumberTooLargeError = 1610,
NSValidationNumberTooSmallError = 1620,
NSValidationDateTooLateError = 1630,
NSValidationDateTooSoonError = 1640,
NSValidationInvalidDateError = 1650,
NSValidationStringTooLongError = 1660,
NSValidationStringTooShortError = 1670,
NSValidationStringPatternMatchingError = 1680,
Jul 22nd, 2009 @ 4:50 pm
How to reload a tableView after changing
Let’s say your UITableViewController implements the NSFetchedResultsControllerDelegate. When you add, remove or change Core Data objects in your context, you’d expect the table view to update, right? Make sure you include the following code in your controller.
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
[self.tableView reloadData];
}
