Component Hosting View Edit on GitHub
So you’ve created a component and now need some way to render it on screen. If your use case involves using components inside a
UICollectionView, you should be using
CKCollectionViewDataSource. However, there are some cases where you want to render a component standalone.
CKComponentHostingView was built for this purpose.
Setting the model
CKComponentHostingView provides a
updateModel:mode: method that you can call to update the model for the hosting view. Similarly a secondary context object is also provided. Updating either model or context will trigger a re-generation of the component in the hosting view.
Size Range Provider
CKComponentHostingView requires a size range provider to be passed into the initializer. The size range provider is an object that responds to a single method (
-sizeRangeForBoundingSize:) that calculates a constraining size for a given view bounding size.
Typically you’ll want to use
CKComponentFlexibleSizeRangeProvider, a class that conforms to
CKComponentSizeRangeProviding and implements a set of common sizing behaviors where none, either, or both dimensions (width and height) can be constrained to the view’s bounding dimensions.
To determine an appropriate size for a component hosting view, call
-sizeThatFits: with the constraining size.
If an internal state change in the component causes its size to be invalidated,
CKComponentHostingView calls its delegate method
-componentHostingViewDidInvalidateSize: in order to notify the owner of the view that it should resize the view (the view will not resize itself).