Difference between addSubview: and insertSubview:atIndex:?

Question

When adding subviews to a UIView, what's the difference between the methods addView: and insertView:atIndex:?

Answer 1

Both add a view to the receiver as a subview, which causes the view to be displayed if the receiver is displayed and positioned relative to the receiver.

But,

• addSubview: adds your view to the end of the subview list, which places it on top of the other subviews when drawing.
• insertSubview:atIndex: adds your view at a particular position in the list, which places it above the subviews that come before it in the list, and below the subviews that come afterward.

[parentView addSubview:childView] is the same as [parentView insertSubview:childView atIndex:[[parentView subviews] count]].

Everything you need to know is here.

Answer 2

AddView adds a view to an array of views.

InsertView adds a view into a specific position in an array.

Other than that, check the Documentation.