macOS Window live resize and timers

[rossipoo]

How can I keep my timers in the runloop firing while the window is being resized? timers in the default run loop will not fire during resize.

 

[kpua]

Did you try adding the timer to the runloop with NSEventTrackingRunLoopMode or NSRunLoopCommonModes?

 

[rossipoo]

That could be it, I will try that. I've never used any others beside the default before.

 

[rossipoo]

I solved the issue using NSRunLoopCommonModes.

I was using the timer to update the content of a view. It changed an ivar and then set the needsDisplay attribute. Unfortunately, the needsDisplay attribute seems to only used by the mainRunLoop. During a live resize, it is never checked. My view content would only redraw when the frame of the view changed; if I just held the resize-corner in one place, it would never update.

I changed the timer to instead call display rather than setNeedsDisplay, which forces a redraw without waiting to return to the runloop.