collectionView.parallaxHeader is nil

[LH-Dunzo]

Issue Description

We are using parallaxHeader inside a collection view. Hence, whenever a collection view reload is called, we try to configure the parallaxHeader again. Now, at times collectionView.parallaxHeader is null. So, it crashes.

• Steps To Reproduce Try calling reload on a collection view using parallaxHeader from background.

Environment Information

• Lib Version - 1.1.0
• OS Version - iOS 12-iOS 15

Code

func setupHeaderView() -> XYZHeaderView {
      let header = XYZHeaderView()
      collectionView.parallaxHeader.view = header
      collectionView.parallaxHeader.height = XYZHeaderView.maxHeight
      collectionView.parallaxHeader.minimumHeight = XYZHeaderView.minHeight
      collectionView.parallaxHeader.mode = .fill
      return header
  }
  let headerView = setupHeaderView() 
  // Accessing  headerView / collectionView.parallaxHeader after a collection view reload crashes

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