ios - Delay start of a CATransition -

it's possible delay animation of catransition? tried startprogressbut doesn't make difference.

this how i'm making transition:

catransition *animation = [catransition animation];     [animation settype:kcatransitionpush];     [animation setsubtype:kcatransitionfromleft];     [animation setduration:0.25];     [animation settimingfunction:[camediatimingfunction functionwithname:                                   kcamediatimingfunctioneaseineaseout]];     [animation setremovedoncompletion:yes];     [self.tabbarcontroller.view.layer addanimation:animation forkey:@"pushanimation"]; 

please read this: http://wangling.me/2011/06/time-warp-in-animation.html it's article additional timing properties of animatios.