IB constant variation pitfall

If you set variation on constant, the constant is adapted when the app is reopened after going to the other app. So if you set the constant vaguely and fix the constant by code at viewDidAppear or willTransition, that part won’t get run at that time. Then constant at normal situations and the constant when the app is reopened after going to the app will be different!

Having fixed number of views with same UI

You can pin multiple views at the same time

You can change the view attribute of the multiple views at the same time

And also you can connect multiple buttons to one action and distinguish among buttons using the View’s Tag.

let tag = button.tag

image = UIImage(named: “\(tag)”)!

how to add lineBreak on IB

ctrl + enter

Make User Interaction only able on the view below other views

uncheck User Interaction Enabled in XIB view tab on the upper views

fixedFrame=YES

constraint가 모자를때 생기는 속성

page view controller

http://stackoverflow.com/questions/32040926/ios-swift-storyboard-add-pageviewcontroller-using-only-part-of-screen

컨텐트 뷰 컨트롤러 재활용하는 예

http://shrikar.com/ios-swift-tutorial-uipageviewcontroller-as-user-onboarding-tool/

margin

margin을 superview에 주고

subview에서 constraint를 relative to superview margin으로 하면 적용됨

label height

label의 height는 text 크기에 맞춰서 정해지기 때문에

height를

l-ㅁ-ㅣ를 눌러서 constraint로 추가해주어야 한다