push 出present 效果

//由于音视频聊天里头有音频和视频聊天界面的切换，直接用present的话页面过渡会不太自然，这里还是用push，然后做出present的效果

NTESAudioChatViewController*vc = [[NTESAudioChatViewControlleralloc]initWithCallee:self.session.sessionId];

CATransition*transition = [CATransitionanimation];

transition.duration=0.25;

transition.timingFunction= [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionDefault];

transition.type=kCATransitionPush;

transition.subtype=kCATransitionFromTop;

[self.navigationController.view.layeraddAnimation:transitionforKey:nil];

self.navigationController.navigationBarHidden=YES;

[self.navigationControllerpushViewController:vcanimated:NO];