Chapter 3: Image Loading Example

Hello,

Iā€™m wondering how the starting code in collectionView(_:cellForItemAt:) is executing on the main UI thread? Is it slow because it is running on the main UI thread by default? I thought for that to happen it needed to be inside the DispatchQueue.main.async { } closure. Any explanation is greatly appreciated.

Thanks!

The app runs on the main thread, by default, unless you do something to move it elsewhere.

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