Waiting until two async blocks are executed before starting another block
When using GCD, we want to wait until two async blocks are executed and done before moving on to the next steps of … Read more
objective-c-blocks
How do I avoid capturing self in blocks when implementing an API?
I have a working app and I’m working on converting it to ARC in Xcode 4.2. One of the pre-check warnings involves capturing … Read more
Block Declaration Syntax List
Block syntax in Objective C (and indeed C, I presume) is notoriously incongruous. Passing blocks as arguments looks different than declaring blocks as … Read more
Can I use Objective-C blocks as properties?
Is it possible to have blocks as properties using the standard property syntax? Are there any changes for ARC? 8 Answers 8
Assign a variable inside a Block to a variable outside a Block
I’m getting an error Variable is not assignable (missing __block type specifier) on the line aPerson = participant;. How can I make sure … Read more
What does the “__block” keyword mean?
What exactly does the __block keyword in Objective-C mean? I know it allows you to modify variables within blocks, but I’d like to … Read more
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
Is there a way to call a block with a primitive parameter after a delay, like using performSelector:withObject:afterDelay: but with an argument like … Read more