MP0w

private extension MKMapRect {
    
    func with(offset: UIOffset, size: CGSize) -> MKCoordinateRegion {
        let horizontalRatio = self.size.width / Double(size.width)
        let verticalRatio = self.size.height / Double(size.height)
        let mapRect = MKMapRectInset(self, horizontalRatio * Double(offset.horizontal), verticalRatio * Double(offset.vertical))
        var region = MKCoordinateRegionForMapRect(mapRect)
        let minSpan = 0.001
        region.span = MKCoordinateSpanMake(max(region.span.latitudeDelta, minSpan), max(region.span.longitudeDelta, minSpan))
        return region

MP0w

MVVMÇ (MVVM Calçot) is an implementation of MVVM influenced by VIPER. Basically VIPER with MVVM names.
The most important concept of MVVMÇ is that implements MVVM with immutable ViewModels, this helps to write correct and testable code with minor complexity.
Other than this it introduces Interactor and Coordinator to MVVM.

Content

• Components
  • Model
  • View

• ViewModel

MP0w

import Foundation
import UIKit

protocol Interactor: class {
    associatedtype ModelType

    var model: ModelType { get }
    var modelDidUpdate: (() -> Void)? { get set }
}