Whose view isn't in the window hierarchy!

whose view isn't in the window hierarchy!
 [ Self Presentviewcontroller: Tabbaranimated:NO Completion:NULL];
not inViewwillappear andviewdidload Implement page Jump

the difference between the Viewdidappear method and the Viewdidload method is that the view has not completely transitioned to the window when the Viewdidload method is called, and the view has completely transitioned to the window when the method call is Viewdidappear. call the Performsegue method in the Viewdidappear method to implement the view jump

Whose view isn't in the window hierarchy!