ios - 两个ViewController传值的问题

Question

一个ViewController 中 有一个 Container ， 即一个VeiwController1中嵌套了另一个ViewController2.
这两个ViewController是同时加载的，这两个同时加载的ViewController之间该如何传值呢，自己试了很多百度的方法，都没有成功，希望能给出一个详细一点的方法，拜托各位大神了。

Answer 1

Use Delegate to pass values ​​locally, and Notification for large areas

Answer 2

You can try block value transfer

Answer 3

Block passing value or Delegate passing value~

Answer 4

v1 —— V2 uses segue to pass the value, because v2 is a container
v2 —— v1 uses block or delegate to pass the value

Answer 5

Use delegate or block