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Can you have a queue manager class observe the count of items in the array and wake itself up when that increments? Then it would stay awake until the queue is empty. Something like... NSMutableArray

By Sandor Szatmari · #527 ·

Re: Changing head item on a (GCD) Queue

Thanks Jens and Quincey, I think the best solution is to do what Jens suggested which is to have a custom thread type arrangement and share an Array as the Queue and protect it with a Lock/Mutex. The

By Dave · #526 ·

Re: Changing head item on a (GCD) Queue

You’re right, I misremembered. GCD has a DispatchWorkItem “cancel” method, which doesn’t have any proper documentation but I think dequeues the item (since GCD doesn’t have an actual

By Quincey Morris · #525 ·

Re: Changing head item on a (GCD) Queue

Honestly I would just implement this in a fairly cross-platform way, by creating my own queue in an NSMutableArray. I'd have a thread reading items out of the queue and processing them, and the method

By Jens Alfke · #524 ·

Re: string pointer

Without having used any apps you've written, I can't compare. And 'out' parameters are widely used in Cocoa programming, not just by Apple. I honestly don't see anything dangerous about the code in

By Jens Alfke · #523 ·

Re: Changing head item on a (GCD) Queue

A little more on this. I was thinking that in the example in my last email could (maybe) be handled like this: The NSOperation class defines a method called something like “setNewData:(NSInteger)

By Dave · #522 ·

Re: Changing head item on a (GCD) Queue

Hi Quincey, I thought about using an NSOperationQueue but from what I can tell, when an operation is cancelled it stays on the queue until the NSOperation method gets called which check the

By Dave · #521 ·

Re: string pointer

Just because you see it in “Apple Code” doesn’t mean its the best or safest way of doing something. Just look at the quality of code coming out of Apple these days, its awful, in fact just look

By Dave · #520 ·

Re: Changing head item on a (GCD) Queue

Not necessarily. Both NSOperationQueue and GCD can cancel un-started operations, but NSOperationQueue has a mechanism for cancelling running operations too. Overall, you probably get more control over

By Quincey Morris · #519 ·

Changing head item on a (GCD) Queue

Hi All, I need to do some changes to a Mac Objective-C project to do the following: 1. Data is Sent to a Delegate method in a class. 2. The data is validated by this method and if ok, it needs to

By Dave · #518 ·

Re: Getting IB_DESIGNABLE to work properly

Of course, but they’re not drawn by -drawRect:, they’re drawn by an internal private method that calls -drawRect: Normally, drawRect is concerned only with the drawing pertaining to itself and

By Graham Cox · #517 ·

Re: Getting IB_DESIGNABLE to work properly

You do want your subviews drawn, right? -- Gary L. Wade http://www.garywade.com/

By Gary L. Wade · #516 ·

Re: Getting IB_DESIGNABLE to work properly

I’ve gone for something slightly different that’s a little more generic (it’ll work for any view, not relying on it being a specific class). It still wouldn’t work for a layer backed or

By Graham Cox · #515 ·

Re: Getting IB_DESIGNABLE to work properly

Cool - I’ll give that a shot. Thanks! —Graham

By Graham Cox · #514 ·

Re: Getting IB_DESIGNABLE to work properly

I’ve never called super, nor understand why it would be needed. I know the boilerplate calls it, but it appears to do nothing. If there has been a change in the recommendation for this since 10.2

By Graham Cox · #513 ·

Re: Getting IB_DESIGNABLE to work properly

Looking at the code, it appears you’re missing a call to [super drawRect:dirtyRect] in your own drawRect: method. -- Gary L. Wade http://www.garywade.com/

By Gary L. Wade · #512 ·

Re: Getting IB_DESIGNABLE to work properly

Works, too!

By Quincey Morris · #511 ·

Re: Getting IB_DESIGNABLE to work properly

Oh, of course, by calling their drawRect, it makes them draw in parent bounds coordinates, not their own bounds coordinates, but you can compensate for that.

By Quincey Morris · #510 ·

Re: Getting IB_DESIGNABLE to work properly

An interesting observation. I went back to your test project and made the digit-array drawRect call drawRect on the subview, and they draw in IB! Unfortunately, they draw in the wrong place. If you

By Quincey Morris · #509 ·

Re: Getting IB_DESIGNABLE to work properly

Yes - the view works properly in the normal runtime case. I’ve determined that the reason is that the IB ‘agent’ for previewing an IB_DESIGNABLE view directly calls -drawRect: on the view - it

By Graham Cox · #508 ·

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