Re: Loops in Objective C?

FROM : Nathan
DATE : Mon May 26 21:35:37 2008

I'm looking into NSTimer then. Thanks!

On May 26, 2008, at 3:30 PM, Thomas Davie wrote:

>
> On 26 May 2008, at 21:30, Nathan wrote:
>

>> How do I redraw then?
>>
>> On May 26, 2008, at 3:26 PM, Thomas Davie wrote:
>>

>>>>
>>>> I won't bother showing you the other files in the project I know 
>>>> they're all in order. So I want the object receiving 
>>>> sliderRotation to rotate, in the above code I want it to rotate 
>>>> forever. If I remove the loop, each time I press the button it 
>>>> rotates -.5 degrees. But with the loop in there, I get the 
>>>> horrible spinning beachball of eternity when I press the button 
>>>> and the object that is supposed to rotate never moves. Do I have 
>>>> to use some special Objective C loop?

>>>
>>> No, no such thing, just your loop never modifies the value of z, 
>>> so your program's execution never proceeds outside the loop.  The 
>>> GUI can't redraw if all your program is doing is looping infinitely.
>>>
>>> Bob

>
> You need to either spread your loop over the run loop, or run it on 
> another thread.  I'd suggest the earlier by having a timer fire a 
> method off at regular intervals to update the control.
>
> Bob