The only difference is in where the view is added: whether it is the frontmost view (addSubview:
), or it is before the 5th subview, (insertSubview:atIndex:
) or if it is immediately behind another subview (insertSubview:aboveSubview:
).
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…