How to add Equal Spacing and equal width for button in iOS Auto layout

Question

Am new to Auto layout constraints in Xcode. I have one Bottom View like UITabBar with 6 UIButtons. Without constraints I aligned those buttons with

Answer 1

check this image and made your constraints like below...

RESULT:- preview in different sizes

---

With Stackview (For iOS 9.0 and above)

NOTE: If you have to make app for iOS 9 and later then UIStackView is another option for you