fix pos

yobble/Views/Chat/PrivateChatView.swift

@@ -3,9 +3,12 @@ import SwiftUI
 struct PrivateChatView: View {
     let chat: PrivateChatListItem
     let currentUserId: String?
+    private let bottomAnchorId = "PrivateChatBottomAnchor"
 
     @StateObject private var viewModel: PrivateChatViewModel
     @State private var hasPositionedToBottom: Bool = false
+    @State private var scrollToBottomTrigger: UUID = .init()
+    @State private var isBottomAnchorVisible: Bool = true
     @State private var draftText: String = ""
     @State private var inputTab: ComposerTab = .chat
     @State private var isVideoPreferred: Bool = false
@@ -19,18 +22,34 @@ struct PrivateChatView: View {
     }
 
     var body: some View {
-        ScrollViewReader { proxy in
-            content
-                .onChange(of: viewModel.messages.count) { _ in
-                    guard !viewModel.isLoadingMore,
-                          let lastId = viewModel.messages.last?.id else { return }
-                    DispatchQueue.main.async {
-                        withAnimation(.easeInOut(duration: 0.2)) {
-                            proxy.scrollTo(lastId, anchor: .bottom)
+        ZStack(alignment: .bottomTrailing) {
+            ScrollViewReader { proxy in
+                content
+                    .onChange(of: viewModel.messages.count) { _ in
+                        guard !viewModel.isLoadingMore else { return }
+                        let targetId = viewModel.messages.last?.id ?? bottomAnchorId
+                        DispatchQueue.main.async {
+                            withAnimation(.easeInOut(duration: 0.2)) {
+                                proxy.scrollTo(targetId, anchor: .bottom)
+                            }
+                            hasPositionedToBottom = true
                         }
-                        hasPositionedToBottom = true
                     }
-                }
+                    .onChange(of: scrollToBottomTrigger) { _ in
+                        let targetId = viewModel.messages.last?.id ?? bottomAnchorId
+                        DispatchQueue.main.async {
+                            withAnimation(.easeInOut(duration: 0.2)) {
+                                proxy.scrollTo(targetId, anchor: .bottom)
+                            }
+                        }
+                    }
+            }
+
+            if !isBottomAnchorVisible {
+                scrollToBottomButton
+                    .padding(.trailing, 20)
+                    .padding(.bottom, 30)
+            }
         }
         .navigationTitle(title)
         .navigationBarTitleDisplayMode(.inline)
@@ -85,9 +104,21 @@ struct PrivateChatView: View {
                        !viewModel.messages.isEmpty {
                         errorBanner(message: message)
                     }
+
+                    Color.clear
+                        .frame(height: 1)
+                        .id(bottomAnchorId)
+                        .onAppear { isBottomAnchorVisible = true }
+                        .onDisappear { isBottomAnchorVisible = false }
                 }
                 .padding(.vertical, 12)
             }
+            .simultaneousGesture(
+                DragGesture().onChanged { value in
+                    guard value.translation.height > 0 else { return }
+                    isComposerFocused = false
+                }
+            )
             .refreshable {
                 viewModel.refresh()
             }
@@ -213,16 +244,16 @@ struct PrivateChatView: View {
                 Button(action: {  }) { // переключатель на стикеры
                     Image(systemName: "paperclip")
                         .font(.system(size: 18, weight: .semibold))
-                        .frame(width: 40, height: 40)
                         .foregroundColor(.secondary)
                 }
+                .buttonStyle(ComposerIconButtonStyle())
 
                 ZStack(alignment: .bottomTrailing) {
                     TextField(inputTab.placeholder, text: $draftText, axis: .vertical)
                         .lineLimit(1...4)
                         .focused($isComposerFocused)
                         .submitLabel(.send)
-                        .disabled(viewModel.isSending || currentUserId == nil)
+                        .disabled(currentUserId == nil)
                         .onSubmit { sendCurrentMessage() }
                         .padding(.top, 10)
                         .padding(.leading, 12)
@@ -249,10 +280,9 @@ struct PrivateChatView: View {
                     Button(action: { isVideoPreferred.toggle() }) {
                         Image(systemName: isVideoPreferred ? "video.fill" : "mic.fill")
                             .font(.system(size: 18, weight: .semibold))
-                            .frame(width: 40, height: 40)
                             .foregroundColor(.secondary)
                     }
-                    .buttonStyle(.plain)
+                    .buttonStyle(ComposerIconButtonStyle())
                 } else {
                     sendButton
                 }
@@ -264,8 +294,21 @@ struct PrivateChatView: View {
         .background(.ultraThinMaterial)
     }
 
+    private var scrollToBottomButton: some View {
+        Button(action: scrollToBottom) {
+            Image(systemName: "arrow.down")
+                .font(.system(size: 18, weight: .semibold))
+                .foregroundColor(.white)
+                .frame(width: 44, height: 44)
+                .background(Color.accentColor)
+                .clipShape(Circle())
+        }
+        .buttonStyle(.plain)
+        .shadow(color: Color.black.opacity(0.2), radius: 4, x: 0, y: 2)
+    }
+
     private var isSendDisabled: Bool {
-        draftText.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty || viewModel.isSending || currentUserId == nil
+        draftText.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty || currentUserId == nil
     }
 
     private var isSendAvailable: Bool {
@@ -317,14 +360,35 @@ struct PrivateChatView: View {
         let text = draftText.trimmingCharacters(in: .whitespacesAndNewlines)
         guard !text.isEmpty else { return }
 
+        draftText = ""
+        scrollToBottomTrigger = .init()
         viewModel.sendMessage(text: text) { success in
             if success {
-                draftText = ""
                 hasPositionedToBottom = true
             }
         }
     }
 
+    private func scrollToBottom() {
+        scrollToBottomTrigger = .init()
+        hasPositionedToBottom = true
+        isBottomAnchorVisible = true
+    }
+
+    private struct ComposerIconButtonStyle: ButtonStyle {
+        func makeBody(configuration: Configuration) -> some View {
+            configuration.label
+                .frame(width: 36, height: 36)
+                .background(Color(.secondarySystemBackground))
+                .clipShape(Circle())
+                .overlay(
+                    Circle().stroke(Color.secondary.opacity(0.15))
+                )
+                .scaleEffect(configuration.isPressed ? 0.94 : 1)
+                .opacity(configuration.isPressed ? 0.75 : 1)
+        }
+    }
+
     private enum ComposerTab: String {
         case chat
         case stickers