⭐️ Impl: ModalSheetBottomDistance

ios/ModalSheet/ModalSheetBottomDistance.swift

@@ -0,0 +1,111 @@
+//
+//  ModalSheetBottomDistance.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 10/6/24.
+//
+
+import Foundation
+import DGSwiftUtilities
+
+public enum ModalSheetBottomDistance {
+  case constant(value: CGFloat);
+
+  case safeArea(
+    additionalValue: CGFloat,
+    minValue: CGFloat
+  );
+
+  // MARK: - Functions
+  // -----------------
+
+  public func createBottomConstraint(
+    forView childView: UIView,
+    attachingTo parentView: UIView
+  ) -> [NSLayoutConstraint] {
+
+    switch self {
+      case let .constant(value):
+        return [
+          childView.bottomAnchor.constraint(
+            equalTo: parentView.bottomAnchor,
+            constant: -value
+          ),
+        ];
+
+      case let .safeArea(additionalValue, minValue):
+        let hasMinValue = minValue != 0;
+
+        guard hasMinValue else {
+          return [
+            childView.bottomAnchor.constraint(
+              equalTo: parentView.safeAreaLayoutGuide.bottomAnchor,
+              constant: additionalValue
+            ),
+          ];
+        };
+
+        let minDistanceConstraint = childView.bottomAnchor.constraint(
+          equalTo: parentView.safeAreaLayoutGuide.bottomAnchor,
+          constant: additionalValue
+        );
+
+        minDistanceConstraint.identifier = "bottomSafeAreaWithMinDistance";
+        minDistanceConstraint.priority = .required;
+
+        let additionalDistanceConstraint = childView.bottomAnchor.constraint(
+          equalTo: parentView.safeAreaLayoutGuide.bottomAnchor,
+          constant: additionalValue
+        );
+
+        additionalDistanceConstraint.identifier = "bottomAdditionalDistance";
+        additionalDistanceConstraint.priority = .defaultHigh;
+
+        return [
+          minDistanceConstraint,
+          additionalDistanceConstraint,
+        ];
+    }
+  };
+};
+
+// MARK: - ModalSheetBottomDistance+StaticAlias
+// --------------------------------------------
+
+public extension ModalSheetBottomDistance {
+  static let zero: Self = .constant(value: 0);
+
+  static let safeArea: Self = .safeArea(
+    additionalValue: 0,
+    minValue: 0
+  );
+
+  static func safeArea(additionalValue: CGFloat) -> Self {
+    .safeArea(
+      additionalValue: additionalValue,
+      minValue: 0
+    );
+  };
+
+  static func safeArea(minValue: CGFloat) -> Self {
+    .safeArea(
+      additionalValue: 0,
+      minValue: minValue
+    );
+  };
+};
+
+// MARK: - ModalSheetBottomDistance
+// --------------------------------
+
+extension ModalSheetBottomDistance: EnumCaseStringRepresentable {
+  public var caseString: String {
+    switch self {
+      case .constant:
+        return "constant";
+
+      case .safeArea:
+        return "safeArea";
+    }
+  };
+};