objective-c - The Dangling Pointer

The Dangling Pointer

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objective-c

A collection of 2 posts

NSNotificationCenter Block-based Observer

Back in iOS 4, a nifty block-based observer method was added to NSNotificationCenter: * (id)addObserverForName:(NSString *)name object:(id)obj queue:(NSOperationQueue *)queue usingBlock:(void (^)(NSNotification *))block; Super convenient, right? I love using blocks to pass simple callbacks to controllers instead of creating a delegate protocol. There is a catch

iOS Basics: nil vs NULL vs NSNull

Yes, there are three ways to represent a null value in Objective-C. NULL = Absence of a value with C-style pointers nil = Absence of value with Objective-C object variables NSNull = A nil boxed as an object for storage in a collection If you try adding nil to a NSDictionary or NSArray,