On 27 Apr 2015, at 10:53, Nisar Ahmed <nisar....@gmail.com> wrote: > My application has a UI having a main window which contains many views such > as NSTableView, NSOutlineView, NSOpenGLView, many NSTextFields etc... > > The applications works normally but after some time the UI stops responding > to the mouse clicks, the application does not hang but it seems that all > the views stop redrawing itself. I have tried many things but fails to > prevent or reproduce the behaviour. Need some advice on how to fix or > atleast find out what is causing such behaviour. > > I am updating all UI controls on the main thread and using Cocoa bindings > heavily.. apparently there is no memory leaks, I am using Xcode 6.1 on > Mavericks
My first suspects if a window stops drawing are always: 1) Drawing attributes that bleed out (e.g. setting the color to white at some point but never back to black, so the next iteration starts out with white instead of the default black) and aren’t wrapped in saveGState 2) Calls to setNeedsDisplay: or display or the like while a drawRect: is running (e.g. setNeedsDisplay: causes drawRect: which sets a property that calls setNeedsDisplay: again which causes a drawRect: on the next run loop iteration, making your Mac constantly redraw stuff until that’s all it does, or even worse manipulating the view hierarchy while the OS is iterating views to draw them). 3) Threaded code that manipulates the UI from another thread than the main thread. There are very few, very specific circumstances under which you may manipulate and draw views and view hierarchies on a non-main thread (or call setNeedsDisplay: or display), so if you do not for a fact know that this is documented as being OK, you probably shouldn’t do it. This case in particular has often screwed up drawing in such a way that the entire window just became a white sheet. I presume you’ve done the usual, i.e. ran Analyze and fixed all it complained about, as well as Instruments. Cheers, -- Uli Kusterer “The Witnesses of TeachText are everywhere...” http://zathras.de _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
