What's the difference between ngOnInit and ngAfterViewInit of Angular2?

Question

I can not understand what the difference between ngOnInit and ngAfterViewInit.

I found the only difference between them is @ViewChild

Answer 1

ngOnInit() is called after ngOnChanges() was called the first time. ngOnChanges() is called every time inputs are updated by change detection.

ngAfterViewInit() is called after the view is initially rendered. This is why @ViewChild() depends on it. You can't access view members before they are rendered.