@MainActor
All user interface changes are updated in the main queue, and some async processes such as async image fetching/loading, update network response to list or grid.
What is a MainActor?
@MainActor is a globally unique actor providing an executor which performs its tasks on the main thread.
It is an example of a GlobalActor
How to use MainActor?
When you put @MainActor on one of them, we can make them perform their tasks on the main thread.
Adding @MainActor
on a class
@MainActor
final class HomeViewModel {
// ..
}on a property
final class HomeViewModel {
@MainActor var images: [UIImage] = []
}on a function
@MainActor
func updateViews() {
// Perform UI updates..
}on a closure
func updateData(completion: @MainActor @escaping () -> ()) {
/// Example dispatch to mimic behavior
DispatchQueue.global().async {
async {
await completion()
}
}
}Direct Call
It comes with an extension that you can call directly
async {
await MainActor.run {
// Perform UI updates
}
}