CANNOT ASSIGN TO 'SELF' OUTSIDE

遇到此错误：

原因是必须要以init开头命名，并且符合规范

比如：initwith...会错

initWith...不会报错

查阅资料：

So two rules that Xcode determine a method is an init method:

return instancetype or id

the method name should be a capital letter followed by "init".

from：

http://junchenghan.com/blog/2016/11/3/errorcannot-assign-to-self-outside-of-a-method-in-the-init-family