方法“插入子视图”和“ presentModalViewController”之间有什么区别？

Question

更改笔尖视图时，这两种方法有什么区别？

Answer 1

addSubview:方法只是向视图层次结构中添加一个新视图，而presentModalViewController:animated:使给定的视图控制器成为活动视图控制器（并使其视图可见）。

Answer 2

"insertsubview" retains the view and sets its next responder to the receiver, which is its new superview.Views can have only one superview. If view already has a superview and that view is not the receiver, this method removes the previous superview before making the receiver its new superview.

"presentmodalviewcontroller" are tools that you can call without disrupting the current workflow and displaying a new set of views.

hope it will help you to understand in basic level and for more in depth please refer Apple's documentation of UIView and ViewControllers.