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UIScrollView

  1. 先设置约束
  2. 在Xcode 11, ScrollView 提供了Content Layout Guide 和 Frame Layout Guide, 默认打开 , 可以在Size Inspector中关闭Content Layout Guides

Content Layout Guide 和 Frame Layout Guide

Frame Layout guide: 需要设置与父视图的约束  position (x, y) and size (width, height) 
Content Layout guide: 需要设置内容的大小约束

1. 拖个UIView到UIScrollView中, View到Content Layout guide设置 leading / top / trailing / bottom 约束为0
2. View到Frame Layout guide, 设置Equal Widths, 比例为1:1
3. 现在只剩下高度设置了

Reference

How to use scroll view in Interface Builder / Storyboard (Xcode 11)

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