simplify logic

modules/bottom-sheet/index.ts

@@ -1,4 +1,13 @@
-import {BottomSheetState, BottomSheetViewProps} from './src/BottomSheet.types'
+import {
+  BottomSheetSnapPoint,
+  BottomSheetState,
+  BottomSheetViewProps,
+} from './src/BottomSheet.types'
 import {BottomSheetView} from './src/BottomSheetView'
 
-export {type BottomSheetState, BottomSheetView, type BottomSheetViewProps}
+export {
+  BottomSheetSnapPoint,
+  type BottomSheetState,
+  BottomSheetView,
+  type BottomSheetViewProps,
+}

modules/bottom-sheet/ios/SheetView.swift

@@ -52,6 +52,22 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
       }
     }
   }
+  private var selectedDetentIdentifier: UISheetPresentationController.Detent.Identifier? {
+    didSet {
+      guard let selectedDetentIdentifier else {
+        return
+      }
+      if selectedDetentIdentifier == .large {
+        onSnapPointChange([
+          "snapPoint": 2
+        ])
+      } else {
+        onSnapPointChange([
+          "snapPoint": 1
+        ])
+      }
+    }
+  }
 
   // MARK: - Lifecycle
 
@@ -104,11 +120,12 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
     }
 
     let sheetVc = SheetViewController()
+    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
     if let sheet = sheetVc.sheetPresentationController {
       sheet.delegate = self
       sheet.preferredCornerRadius = self.cornerRadius
+      self.selectedDetentIdentifier = sheet.selectedDetentIdentifier
     }
-    sheetVc.setDetents(contentHeight: self.clampHeight(contentHeight), preventExpansion: self.preventExpansion)
     sheetVc.view.addSubview(innerView)
 
     self.sheetVc = sheetVc
@@ -161,16 +178,6 @@ class SheetView: ExpoView, UISheetPresentationControllerDelegate {
   }
   
   func sheetPresentationControllerDidChangeSelectedDetentIdentifier(_ sheetPresentationController: UISheetPresentationController) {
-    let identifier = sheetPresentationController.selectedDetentIdentifier
-    
-    if identifier == .large {
-      onSnapPointChange([
-        "snapPoint": 2,
-      ])
-    } else {
-      onSnapPointChange([
-        "snapPoint": 1,
-      ])
-    }
+    self.selectedDetentIdentifier = sheetPresentationController.selectedDetentIdentifier
   }
 }

modules/bottom-sheet/src/BottomSheet.types.ts

@@ -3,6 +3,12 @@ import {ColorValue, NativeSyntheticEvent} from 'react-native'
 
 export type BottomSheetState = 'closed' | 'closing' | 'open' | 'opening'
 
+export enum BottomSheetSnapPoint {
+  Hidden,
+  Partial,
+  Full,
+}
+
 export interface BottomSheetViewProps {
   children: React.ReactNode
   cornerRadius?: number
@@ -15,8 +21,11 @@ export interface BottomSheetViewProps {
   minHeight?: number
   maxHeight?: number
 
+  onAttemptDismiss?: (event: NativeSyntheticEvent<object>) => void
+  onSnapPointChange?: (
+    event: NativeSyntheticEvent<{snapPoint: BottomSheetSnapPoint}>,
+  ) => void
   onStateChange?: (
     event: NativeSyntheticEvent<{state: BottomSheetState}>,
   ) => void
-  onAttemptDismiss?: (event: NativeSyntheticEvent<object>) => void
 }