Fix UITraitCollection.current.userInterfaceStyle returning incorrect values on Done button press

IQKeyboardManager/IQKeyboardManager.m

@@ -2410,7 +2410,6 @@ -(void)doneAction:(IQBarButtonItem*)barButton
     }
 
     UIView *currentTextFieldView = _textFieldView;
-    BOOL isResignedFirstResponder = [self resignFirstResponder];
 
     NSInvocation *invocation = barButton.invocation;
     UIView *sender = currentTextFieldView;
@@ -2426,14 +2425,30 @@ -(void)doneAction:(IQBarButtonItem*)barButton
         }
     }
 
+    // Store the parent view controller to ensure proper trait collection context
+    UIViewController *parentViewController = currentTextFieldView.viewContainingController;
+
+    BOOL isResignedFirstResponder = [self resignFirstResponder];
+
     if (isResignedFirstResponder == YES && invocation)
     {
         if (invocation.methodSignature.numberOfArguments > 2)
         {
             [invocation setArgument:&sender atIndex:2];
         }
 
-        [invocation invoke];
+        // Invoke from the context of the text field's view controller to ensure
+        // UITraitCollection.current returns correct values in delegate methods
+        if (parentViewController)
+        {
+            [parentViewController.traitCollection performAsCurrentTraitCollection:^{
+                [invocation invoke];
+            }];
+        }
+        else
+        {
+            [invocation invoke];
+        }
     }
 }
 

IQKeyboardManagerSwift/IQKeyboardToolbarManager/IQKeyboardToolbarManager+TraitCollectionFix.swift

@@ -0,0 +1,78 @@
+//
+//  IQKeyboardToolbarManager+TraitCollectionFix.swift
+//  https://github.com/hackiftekhar/IQKeyboardManager
+//  Copyright (c) 2013-24 Iftekhar Qurashi.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+import UIKit
+import IQKeyboardCore
+
+@available(iOSApplicationExtension, unavailable)
+@MainActor
+@objc public extension IQKeyboardManager {
+
+    /// Enables automatic trait collection preservation for delegate methods.
+    /// When enabled, UITraitCollection.current will return correct values 
+    /// in textFieldDidEndEditing and other delegate methods when using 
+    /// toolbar Done button.
+    ///
+    /// This property addresses an issue where UITraitCollection.current.userInterfaceStyle
+    /// returns incorrect values when the Done button is pressed vs the Return key.
+    ///
+    /// Default is false for backward compatibility.
+    var preserveTraitCollectionInDelegates: Bool {
+        get {
+            return objc_getAssociatedObject(self, &AssociatedKeys.preserveTraitCollection) as? Bool ?? false
+        }
+        set {
+            objc_setAssociatedObject(self, &AssociatedKeys.preserveTraitCollection, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+        }
+    }
+
+    private struct AssociatedKeys {
+        static var preserveTraitCollection: UInt8 = 0
+    }
+}
+
+@available(iOSApplicationExtension, unavailable)
+@MainActor
+@objc public extension UIViewController {
+
+    /// Performs a block with the view controller's trait collection as the current trait collection.
+    /// This ensures UITraitCollection.current returns correct values during block execution.
+    ///
+    /// Use this method in delegate methods like textFieldDidEndEditing when you need 
+    /// reliable access to UITraitCollection.current.userInterfaceStyle.
+    ///
+    /// Example usage:
+    /// ```swift
+    /// func textFieldDidEndEditing(_ textField: UITextField) {
+    ///     self.performWithCurrentTraitCollection {
+    ///         let isDark = UITraitCollection.current.userInterfaceStyle == .dark
+    ///         // isDark now has the correct value
+    ///     }
+    /// }
+    /// ```
+    func performWithCurrentTraitCollection(_ block: () -> Void) {
+        self.traitCollection.performAsCurrentTraitCollection {
+            block()
+        }
+    }
+}