Question

When Mac kernel panic, there’s animation, it’s not like slide animation exactly, how to implement this animation in iPhone, is there a exist API to do this?

Answer 1

There is no API for that but it is fairly simple animation:
Simply create a UIView and animate its frame, changing from 0 height to full height:

   // Create your view
   UIView *kPview = [[UIView alloc] init];
   // Add it to your view
   [self.view addSubView:kPview]
   // Set its frame
   kPview.frame = CGRectMake(0,0,320,0);

   //Set the animation
   [UIView animateWithDuration:5 
                 animations:^{
                     kPview.frame = CGRectMake(0,0,320,460);
                 }
                 completion:^(BOOL finished){
                     //add a UILabel with the warning.
                 }];