PageView with peeking item in UICollectionView.

Using UICollectionViewCompositionalLayout

ViewController lifeCycle and modalPresentationStyle.

Correlation between them.

Simple QR Scanner.

Read QR value using back camera.

KeyChain and App update.

KeyChain may removed by Application update.

Timeout custom view for network.

Custom view of timeout blocking view within network connection.

About, custom View initiation Timing and Z position.

May helpful, making custom view in kotlin.