fix(ios): add null guard (#52)

Author: lodev09

android/src/main/java/com/lodev09/truesheet/TrueSheetView.kt

@@ -172,13 +172,13 @@ class TrueSheetView(context: Context) :
       // Initialize content
       UiThreadUtil.runOnUiThread {
         // 1st child is the content view
-        val contentView = it.getChildAt(0) as ViewGroup
-        setContentHeight(contentView.height)
+        val contentView = it.getChildAt(0) as ViewGroup?
+        setContentHeight(contentView?.height ?: 0)
 
         // 2nd child is the footer view
-        val footerView = it.getChildAt(1) as ViewGroup
+        val footerView = it.getChildAt(1) as ViewGroup?
         sheetDialog.footerView = footerView
-        setFooterHeight(footerView.height)
+        setFooterHeight(footerView?.height ?: 0)
 
         if (initialIndex >= 0) {
           currentSizeIndex = initialIndex

ios/TrueSheetView.swift

@@ -45,6 +45,11 @@ class TrueSheetView: UIView, RCTInvalidating, TrueSheetViewControllerDelegate {
 
   private var rctScrollView: RCTScrollView?
 
+  private var uiManager: RCTUIManager? {
+    guard let uiManager = bridge?.uiManager else { return nil }
+    return uiManager
+  }
+
   // MARK: - Setup
 
   init(with bridge: RCTBridge) {
@@ -143,7 +148,7 @@ class TrueSheetView: UIView, RCTInvalidating, TrueSheetViewControllerDelegate {
     guard let containerView else { return }
 
     let size = CGSize(width: width, height: containerView.bounds.height)
-    bridge?.uiManager.setSize(size, for: containerView)
+    uiManager?.setSize(size, for: containerView)
   }
 
   func viewControllerWillAppear() {
@@ -297,7 +302,7 @@ class TrueSheetView: UIView, RCTInvalidating, TrueSheetViewControllerDelegate {
 
   @objc
   func setScrollableHandle(_ tag: NSNumber?) {
-    let view = bridge?.uiManager.view(forReactTag: tag) as? RCTScrollView
+    let view = uiManager?.view(forReactTag: tag) as? RCTScrollView
     rctScrollView = view
   }