shles

class ReusableView<ViewModelType: ViewModel> where ViewModelType.ViewType == ReusableView<ViewModelType> {
    var viewMdoel: ViewModelType!
}

shles

protocol ViewModel {
    associatedtype ViewType
    var view: ViewType! {get}
}

shles

let groups = Dictionary(grouping: events) {
    return Calendar.current.dateComponents([.year, .month, .day], from: $0.date)
}
.map({ element  in
    (Calendar.current.date(from: element.key)!, element.value)
})
.sorted(by: { elemnet1, element2 -> Bool in
    elemnet1.0 > element2.0
})