iOS IPHONE APP Developer (Certified) Exam?

[SophiaAye]

Hi, like microsoft, is there any exam for certified as Iphone app developer?
Because if you are going to hire, how do you measure their skills?
How do you know they have experience and techniques as professional app developer?
I found a lot of books reference for the IPHONE App. Developer Program and confuses too.

 

[chown33]

If you're hiring, you ask to see their apps.

If they don't have any apps, you ask to see their other work.

If they don't have any other work, you ask to see their certifications.

If they don't have any certifications, you ask why they bothered applying.

Overall, certifications rank lowest in what an employer would want to see.