iOS 6.1.3 & 7.0.2, newb! I'm seeing an unacceptable lag in my iOS app on drag touches, from when a finger is dragged across the screen to when my code updates the screen. I can't figure out what is causing the lag.
Here's my setup. I have a -touchesBegan:withEvent: method in my view controller that gets invoked via callback from the GUI when a finger touch occurs. My code displays a tiny dot on the GUI beneath the user's fingertip that is supposed to track with the user's touch in real time. -(void) -touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint apoint=[[touches anyObject] locationInView:[self view]]; [layer setPosition:apoint]; } The 'layer' variable is defined as: CALayer *layer=[[CALayer alloc]init]; [layer setDelegate:self]; [layer setBounds:CGRectMake(0,0,5,5)]; // a tiny "dot" This all works well except when the user makes large, sweeping touches (say dragging a fingertip across the entire screen). In this case, the update drawing of the dot lags a second or two behind, which is unacceptable. So I'm wondering how to handle this. FWIW, adding a [super touchesBegan:touches withEvent:event] to the above callback method didn't change the behavior. - Carl _______________________________________________ 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