add limit lines

yobble/Views/Chat/PrivateChatView.swift

@@ -8,6 +8,8 @@ struct PrivateChatView: View {
     let currentUserId: String?
     private let bottomAnchorId = "PrivateChatBottomAnchor"
     
+    let lineLimitInChat = 6
+
     @StateObject private var viewModel: PrivateChatViewModel
     @State private var hasPositionedToBottom: Bool = false
     @State private var scrollToBottomTrigger: UUID = .init()
@@ -247,9 +249,9 @@ struct PrivateChatView: View {
 
                 ZStack(alignment: .bottomTrailing) {
                     Group {
-                        if #available(iOS 160.0, *) {
+                        if #available(iOS 16.0, *) {
                             TextField(inputTab.placeholder, text: $draftText, axis: .vertical)
-                                .lineLimit(1...4)
+                                .lineLimit(1...lineLimitInChat)
                                 .focused($isComposerFocused)
                                 .submitLabel(.send)
                                 .disabled(currentUserId == nil)
@@ -264,7 +266,7 @@ struct PrivateChatView: View {
                                 ),
                                 isEnabled: currentUserId != nil,
                                 minHeight: 10,
-                                maxLines: 4,
+                                maxLines: lineLimitInChat,
                                 calculatedHeight: $legacyComposerHeight,
                                 onSubmit: sendCurrentMessage
                             )
@@ -504,7 +506,12 @@ private struct LegacyMultilineTextView: UIViewRepresentable {
 
         context.coordinator.updatePlaceholderVisibility(for: textView)
         DispatchQueue.main.async {
-            Self.recalculateHeight(for: textView, result: calculatedHeightBinding, minHeight: minHeight, maxLines: maxLines)
+            Self.recalculateHeight(
+                for: textView,
+                result: calculatedHeightBinding,
+                minHeight: minHeight,
+                maxLines: maxLines
+            )
         }
 
         return textView
@@ -534,7 +541,12 @@ private struct LegacyMultilineTextView: UIViewRepresentable {
             uiView.resignFirstResponder()
         }
 
-        Self.recalculateHeight(for: uiView, result: calculatedHeightBinding, minHeight: minHeight, maxLines: maxLines)
+        Self.recalculateHeight(
+            for: uiView,
+            result: calculatedHeightBinding,
+            minHeight: minHeight,
+            maxLines: maxLines
+        )
     }
 
     func makeCoordinator() -> Coordinator {
@@ -559,12 +571,18 @@ private struct LegacyMultilineTextView: UIViewRepresentable {
         let lineHeight = textView.font?.lineHeight ?? UIFont.preferredFont(forTextStyle: .body).lineHeight
         let maxHeight = minHeight + lineHeight * CGFloat(max(maxLines - 1, 0))
         let clampedHeight = min(max(targetSize.height, minHeight), maxHeight)
+        let shouldScroll = targetSize.height > maxHeight + 0.5
 
         if abs(result.wrappedValue - clampedHeight) > 0.5 {
-            result.wrappedValue = clampedHeight
+            let newHeight = clampedHeight
+            DispatchQueue.main.async {
+                if abs(result.wrappedValue - newHeight) > 0.5 {
+                    result.wrappedValue = newHeight
+                }
+            }
         }
 
-        textView.isScrollEnabled = targetSize.height > maxHeight + 0.5
+        textView.isScrollEnabled = shouldScroll
     }
 
     final class Coordinator: NSObject, UITextViewDelegate {