Segue 动画中断

Question

A lot of times the segue animations in my app do break. When this happens all these animation flick at once instead of the popover/slide transitions. I don't use any custom segue animations. I can't find what a reason for this behaviour could be so I don't know where to start with debugging. I tried symbolic breakpoints but so far no luck. What can be the reason that the animations break?

My storyboard is:

Tab Bar View controller > Navigation controller > Table view controller > push to other storyboard > navigation controller > Table view controller

Answer 1

The animations did break because an UIImageView was updated outside the main thread.

Fixed it by wrapping it in:

dispatch_async(dispatch_get_main_queue(),{
    //update image view
})