FIRAuth.auth（）编译错误：“无法对非可选值'FIRAuth'使用可选链接”

Question

Cannot use optional chaining on non optional value 'FIRAuth'

I have tested every solutions, but always got the same error. Even if i create a new project, when i'm using FIRAuth, i always got a compiling error.

Can someone help me please. I use Swift 2, Xcode 7, IOS9

Answer 1

If you are trying to add FIRAuth.auth()? try to remove (?).

FIRAuth.auth() is non optional so treating them as one might result to the error “Cannot use optional chaining on non optional value 'FIRAuth'”

Optional chaining is a process for querying and calling properties, methods, and subscripts on an optional that might currently be nil

Check Optional Chaining