It is now possible to set TextAlignment using .multilineTextAlignment(_:) (read once on setup, à la SwiftUI.TextField) or proxy.text.alignment(_:).

Author: oscbyspro

Sources/DiffableTextViewsXiOS/DiffableTextField.swift

@@ -59,6 +59,7 @@ public struct DiffableTextField<Style: DiffableTextStyleXiOS>: UIViewRepresentab
         let uiView = BasicTextField()
         uiView.delegate = context.coordinator
         uiView.font = UIFont(DiffableTextFont.body.monospaced())
+        uiView.setTextAlignment(context.environment)
         uiView.setContentHuggingPriority(.defaultHigh, for: .vertical)
         uiView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
         //=--------------------------------------=

Sources/DiffableTextViewsXiOS/Helpers/&UIView.swift

@@ -0,0 +1,29 @@
+//=----------------------------------------------------------------------------=
+// This source file is part of the DiffableTextViews open source project.
+//
+// Copyright (c) 2022 Oscar Byström Ericsson
+// Licensed under Apache License, Version 2.0
+//
+// See http://www.apache.org/licenses/LICENSE-2.0 for license information.
+//=----------------------------------------------------------------------------=
+
+#if canImport(UIKit)
+
+import UIKit
+
+//*============================================================================*
+// MARK: * UIView
+//*============================================================================*
+
+extension UIView {
+    
+    //=------------------------------------------------------------------------=
+    // MARK: Accessors
+    //=------------------------------------------------------------------------=
+    
+    @inlinable var userInterfaceLayoutDirection: UIUserInterfaceLayoutDirection {
+        UIView.userInterfaceLayoutDirection(for: semanticContentAttribute)
+    }
+}
+
+#endif

Sources/DiffableTextViewsXiOS/Models/Alignment.swift

@@ -0,0 +1,38 @@
+//=----------------------------------------------------------------------------=
+// This source file is part of the DiffableTextViews open source project.
+//
+// Copyright (c) 2022 Oscar Byström Ericsson
+// Licensed under Apache License, Version 2.0
+//
+// See http://www.apache.org/licenses/LICENSE-2.0 for license information.
+//=----------------------------------------------------------------------------=
+
+#if canImport(UIKit)
+
+import SwiftUI
+import UIKit
+
+//*============================================================================*
+// MARK: * UITextField x Alignment
+//*============================================================================*
+
+extension UITextField {
+    
+    //=------------------------------------------------------------------------=
+    // MARK: Transformations
+    //=------------------------------------------------------------------------=
+    
+    @inlinable func setTextAlignment(_ environment: EnvironmentValues) {
+        self.setTextAlignment(environment.multilineTextAlignment)
+    }
+    
+    @inlinable func setTextAlignment(_ newValue: TextAlignment) {
+        switch newValue {
+        case  .leading: textAlignment = (userInterfaceLayoutDirection == .leftToRight) ?  .left : .right
+        case .trailing: textAlignment = (userInterfaceLayoutDirection == .leftToRight) ? .right :  .left
+        case   .center: textAlignment = .center
+        }
+    }
+}
+
+#endif

Sources/DiffableTextViewsXiOS/Views/ProxyTextField+Text.swift

@@ -9,6 +9,7 @@
 
 #if canImport(UIKit)
 
+import SwiftUI
 import UIKit
 
 //*============================================================================*
@@ -29,6 +30,10 @@ public extension ProxyTextField.Text {
     // MARK: Transformations
     //=------------------------------------------------------------------------=
 
+    @inlinable func alignment(_  alignment: TextAlignment) {
+        wrapped.setTextAlignment(alignment)
+    }
+    
     @inlinable func color(_ color: UIColor) {
         wrapped.textColor = color
     }