Difference between addSubview and insertSubview in UIView class

Question

What is the difference between addSubview and insertSubView methods when a view is added programmatically?

Answer 1

1.addSubview add subview in array then add in View'slayer

- (void)addSubview:(UIView *)subview
{
    [_subviews addObject:subview];
    [_layer addSublayer:subview.layer];
}

}

2.While insertSubview add your view as subview then call [_layer insertSublayer:subview.layer atIndex:index];

- (void)insertSubview:(UIView *)subview atIndex:(NSInteger)index
{
  [self addSubview:subview];
  [_layer insertSublayer:subview.layer atIndex:index];
}