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Create a collection view with custom layouts


I decided to create a design with nested images in the app I'm working on, so I looked into how to implement it.

I used the following site as a reference for the main code.
Thank you very much.
The Swift2->4 conversion was a pain.

iOS UICollecionViewFlowLayout でカスタムレイアウトを作ろう ~ Swift版


  1. UDP communication in Swift and sending a string
  2. Removing @objc inference warnings when migrating from Swift3 to Swift4
  3. Pinch to zoom in and out on an image with UIScrollView
  4. Removing the back button in UINavigationController.
  5. Execute after ○ seconds, execute every second
  6. Setting a header in UITableView
  7. Adding a Custom Cell to UICollectionView