[Sheets] [Pt. 1] Root PR (#5557)

Co-authored-by: Samuel Newman <mozzius@protonmail.com>
Co-authored-by: Eric Bailey <git@esb.lol>
Co-authored-by: dan <dan.abramov@gmail.com>
Co-authored-by: Hailey <me@haileyok.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/modules/bottom-sheet/ios/SheetViewController.swift b/modules/bottom-sheet/ios/SheetViewController.swift
new file mode 100644
index 000000000..56473b21c
--- /dev/null
+++ b/modules/bottom-sheet/ios/SheetViewController.swift
@@ -0,0 +1,76 @@
+//
+//  SheetViewController.swift
+//  Pods
+//
+//  Created by Hailey on 9/30/24.
+//
+
+import Foundation
+import UIKit
+
+class SheetViewController: UIViewController {
+  init() {
+    super.init(nibName: nil, bundle: nil)
+
+    self.modalPresentationStyle = .formSheet
+    self.isModalInPresentation = false
+
+    if let sheet = self.sheetPresentationController {
+      sheet.prefersGrabberVisible = false
+    }
+  }
+
+  func setDetents(contentHeight: CGFloat, preventExpansion: Bool) {
+    guard let sheet = self.sheetPresentationController,
+          let screenHeight = Util.getScreenHeight()
+    else {
+      return
+    }
+
+    if contentHeight > screenHeight - 100 {
+      sheet.detents = [
+        .large()
+      ]
+      sheet.selectedDetentIdentifier = .large
+    } else {
+      if #available(iOS 16.0, *) {
+        sheet.detents = [
+          .custom { _ in
+            return contentHeight
+          }
+        ]
+      } else {
+        sheet.detents = [
+          .medium()
+        ]
+      }
+
+      if !preventExpansion {
+        sheet.detents.append(.large())
+      }
+      sheet.selectedDetentIdentifier = .medium
+    }
+  }
+
+  func updateDetents(contentHeight: CGFloat, preventExpansion: Bool) {
+    if let sheet = self.sheetPresentationController {
+      sheet.animateChanges {
+        self.setDetents(contentHeight: contentHeight, preventExpansion: preventExpansion)
+        if #available(iOS 16.0, *) {
+          sheet.invalidateDetents()
+        }
+      }
+    }
+  }
+  
+  func getCurrentDetentIdentifier() -> UISheetPresentationController.Detent.Identifier? {
+    guard let sheet = self.sheetPresentationController else {
+      return nil
+    }
+    return sheet.selectedDetentIdentifier
+  }
+
+  required init?(coder: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
+}