Difference between addSubview and insertSubview in UIView class

Question

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

thank

Ashwani

Answer 1

The only difference is where the view is added: whether it is the front-most view ( addSubview: , or it is in front of the 5th subzone ( insertSubview:atIndex: , or if it is immediately behind another view ( insertSubview:aboveSubview: .

Answer 2

Using insertSubView: you can specify an index that defines the z-order of the views. A view with a higher index is higher than those with lower indices.

Answer 3

I do not think there is a difference. addSubview: is a simple convenient method for

 [view insertSubview:aView atIndex:[view.subviews count]] 

Answer 4

1.addSubview add subview to array and then add to View'slayer

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

}

2. If insertSubview adds your view as a subzone, then call [_layer insertSublayer:subview.layer atIndex:index];

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