Swift: Create Facebook (Part 2) – UICollectionView, NSLayoutConstraint

my review point is 8/10

https://youtu.be/ZwBYQpLQAvw?t=8m15s   button style ( setTitle, setTitleColor , setImage , titleEdgeInsets)

https://youtu.be/ZwBYQpLQAvw?t=14m35s   equally spaced out elements 

https://youtu.be/ZwBYQpLQAvw?t=18m37s   refresh collection view when user change orientation ( viewWillTransitionToSize , invalidateLayout)

Swift: Firebase 3 – How to Build a Login Page Using iOS9 Constraint Anchors (Ep 1)

my review point is 8/10

https://youtu.be/lWSc0wHFTXM?t=5m9s   storyboard 없이 프로젝트 시작

https://youtu.be/lWSc0wHFTXM?t=8m45s   make left bar 

https://youtu.be/lWSc0wHFTXM?t=10m30s   버튼 클릭시 새로운 view controller 여는 방법

https://youtu.be/lWSc0wHFTXM?t=11m14s   status bar 스타일 바꾸기

https://youtu.be/lWSc0wHFTXM?t=19m40s   ui view 코너 둥글게 하는 방법 (cornerRadius, maskToBounds)

setTitleColor – 버튼 타이틀 글자색 고치기

secureTextEntry – 프로퍼티 비밀번호 입력창 효과

contentMode – image view의 프로퍼티 크기변경에 따른 비율변경 여부