diff --git a/AreYouSleeping/Views/ContentView.swift b/AreYouSleeping/Views/ContentView.swift
index 54da8cd..2806a0e 100644
--- a/AreYouSleeping/Views/ContentView.swift
+++ b/AreYouSleeping/Views/ContentView.swift
@@ -1,4 +1,5 @@
 import SwiftUI
+import UIKit
 
 struct ContentView: View {
     @EnvironmentObject var store: Store
diff --git a/AreYouSleeping/Views/FriendControlView.swift b/AreYouSleeping/Views/FriendControlView.swift
index eef4377..9468d44 100644
--- a/AreYouSleeping/Views/FriendControlView.swift
+++ b/AreYouSleeping/Views/FriendControlView.swift
@@ -12,8 +12,8 @@ struct FriendControlView: View {
             Section {
                 HStack {
                     TextField("输入朋友的控制码", text: $friendCode)
-                        .autocapitalization(.allCharacters)
                         .disableAutocorrection(true)
+                        .textCase(.uppercase)
                     Button("查询") { lookupFriend() }
                         .buttonStyle(.borderedProminent)
                         .controlSize(.small)