Re: UIView/NSView doesn't display changing data in real time
Re: UIView/NSView doesn't display changing data in real time
- Subject: Re: UIView/NSView doesn't display changing data in real time
- From: Steve Christensen <email@hidden>
- Date: Tue, 19 Apr 2011 11:32:53 -0700
Is your call to -setNeedsDisplay being done on the main thread or from your background thread. I seem to recall that you get ignored if the call is not made on the main thread, so you'd need to use one of the -performSelectorOnMainThread:... methods.
On Apr 19, 2011, at 10:51 AM, Frederick C. Lee wrote:
> Simple scenario: background thread is computing data to be displayed in real time within the main thread.
> Data: dynamic/variable data that is converted into a NSString type within a background thread, displayed within a UILabel (or NSLabel) on the main thread.
>
> My own environment: iOS 4+ (relevant to OS X as well) using Xcode 4+.
>
> Design: background thread (via NSOperation/NSOperationQueue) sends data/iteration to the main (host) thread via DELEGATION.
>
> Note: the main thread *** sees **** this data in read time (via NSLog() stmt )....
>
> However, the front end UIView (or NSView) does NOT update/iteration in real time.
>
> Paradigm Request: a real-time digital clock.... tick, tick... you see the seconds being updated. I need to ditto that with velocity, position, etc.
> I tried the 'setNeedsDisplay' method call; has no effect.
>
> Question: What is the preferred way to display within the MAIN thread in real time, data that is computed on a back-end thread?
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