Endemic questions

Endemic answers

• @selector with multiple arguments
• NSPredicate to filter out all items that are in another set
• Is there a difference between NSString compare: and isEqual(ToString):?
• Merge NSMutableArray with a NSArray, filtering the duplicates
• enabling the "return button" in a UITextField keyboard (objective-c/iphone)
• Comparing NSDates to determine day or night?
• How to group two CABasicAnimation animations and kick them off at the exact same time?