What mean of this [closed]

Question

I am reading a matt's iOS book, when I read here, I have two place do not understand.

For a view’s underlying layer, layoutSublayers or layoutSublayers(of:) is called after the view’s layoutSubviews. Under autolayout, you must call super or else autolayout will break. Moreover, these methods may be called more than once during the course of autolayout; if you’re looking for an automatically generated signal that it’s time to do manual layout of sublayers, a view layout event might be a better choice.

1. "you must call super or else autolayout will break", this phrase I can't understand.
2. "if you’re looking for an automatically generated signal that it’s time to do manual layout of sublayers"

What mean of the two place?

Answer 1

"you must call super or else autolayout will break"

You must invoke the superclass constructor or the autolayout will not work. I have no idea why this is, or why it breaks formatting.

"if you’re looking for an automatically generated signal that it’s time to do manual layout of sublayers, a view layout event might be a better choice."

If you want an event to fire when it's time to invoke your method that manually lays out sublayers, you should use a "view layout event" (presumably instead of autolayout).

Again, no idea what he's talking about, but that's what it seems to mean. It's not very well-written, and certainly even more incomprehensible without the complete context.