所以我為我的顫振應用程式制作了一個自定義應用程式抽屜。但是現在當我單擊打開的抽屜選單按鈕時，我的小部件樹的第一個 else 陳述句被執行。我對顫動比較陌生。有誰知道我在這里做錯了什么？
這是 CustomDrawer 代碼。
import 'package:flutter/material.dart';
import 'package:open_cart/utils/colors.dart';
import 'package:open_cart/utils/styles.dart';
import 'package:open_cart/widgets/drawer_tile_custom_widget.dart';
class CustomAppDrawerWidget extends StatelessWidget {
final bool _isLoggedIn = true;
const CustomAppDrawerWidget({
Key? key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Drawer(
child: Container(
color: colorDarkGrey,
child: ListView(
children: [
DrawerHeader(
child: Center(
child: Text(
'The BurgerSpot',
style: tsCOrangeCustomFFPrimaryS45,
),
),
),
if (_isLoggedIn)
DrawerTileCustomWidget(
title: 'Saved Addresses',
iconData: Icons.home,
onPressed: () {
print('test3');
},
),
if (!_isLoggedIn)
DrawerTileCustomWidget(
title: 'My Account',
iconData: Icons.person,
onPressed: () {
print('test2');
},
)
else
DrawerTileCustomWidget(
title: 'Login/Register',
iconData: Icons.login,
onPressed: () {
print('test1');
},
),
if (_isLoggedIn)
DrawerTileCustomWidget(
title: 'Orders',
iconData: Icons.store,
onPressed: () {},
),
DrawerTileCustomWidget(
title: 'Deals and Offers',
iconData: Icons.star_border,
onPressed: () {},
),
DrawerTileCustomWidget(
title: 'Contact us',
iconData: Icons.login,
onPressed: () {},
),
],
),
));
}
}
這是 CustomDrawerTile 代碼。
import 'package:flutter/material.dart';
import 'package:open_cart/utils/colors.dart';
import 'package:open_cart/utils/styles.dart';
class DrawerTileCustomWidget extends StatelessWidget {
final IconData? iconData;
final String? title;
final Function? onPressed;
const DrawerTileCustomWidget({
Key? key,
required this.iconData,
required this.title,
required this.onPressed,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return ListTile(
leading: Icon(
iconData,
color: colorFF,
),
title: Text(
title.toString(),
style: tsCwhiteFFPrimaryS15,
),
onTap: onPressed!(),
);
}
}
這是我的除錯控制臺的輸出。
Launching lib\main.dart on AOSP on IA Emulator in debug mode...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
W/FlutterActivityAndFragmentDelegate(24256): A splash screen was provided to Flutter, but this is deprecated. See flutter.dev/go/android-splash-migration for migration steps.
D/eglCodecCommon(24256): setVertexArrayObject: set vao to 0 (0) 1 2
I/OpenGLRenderer(24256): Davey! duration=702ms; Flags=1, IntendedVsync=63537921942406, Vsync=63538505275716, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=63538521171700, AnimationStart=63538521225400, PerformTraversalsStart=63538521936600, DrawStart=63538529983700, SyncQueued=63538537071200, SyncStart=63538538794200, IssueDrawCommandsStart=63538539191100, SwapBuffers=63538601435900, FrameCompleted=63538626192900, DequeueBufferDuration=17778000, QueueBufferDuration=331000,
Connecting to VM Service at ws://127.0.0.1:54707/W23b5t3IEOE=/ws
D/eglCodecCommon(24256): setVertexArrayObject: set vao to 0 (0) 1 0
W/DynamiteModule(24256): Local module descriptor class for com.google.android.gms.providerinstaller.dynamite not found.
I/DynamiteModule(24256): Considering local module com.google.android.gms.providerinstaller.dynamite:0 and remote module com.google.android.gms.providerinstaller.dynamite:0
W/ProviderInstaller(24256): Failed to load providerinstaller module: No acceptable module com.google.android.gms.providerinstaller.dynamite found. Local version is 0 and remote version is 0.
I/m.opencart.sho(24256): The ClassLoaderContext is a special shared library.
I/m.opencart.sho(24256): The ClassLoaderContext is a special shared library.
I/chatty (24256): uid=10086(com.opencart.shop) AsyncTask #2 identical 1 line
I/m.opencart.sho(24256): The ClassLoaderContext is a special shared library.
W/m.opencart.sho(24256): Accessing hidden field Ljava/nio/Buffer;->address:J (light greylist, reflection)
W/ProviderInstaller(24256): Failed to report request stats: reportRequestStats [class android.content.Context, long, long]
V/NativeCrypto(24256): Registering com/google/android/gms/org/conscrypt/NativeCrypto's 286 native methods...
W/m.opencart.sho(24256): Accessing hidden method Ljava/security/spec/ECParameterSpec;->getCurveName()Ljava/lang/String; (light greylist, reflection)
D/NetworkSecurityConfig(24256): No Network Security Config specified, using platform default
I/ProviderInstaller(24256): Installed default security provider GmsCore_OpenSSL
W/m.opencart.sho(24256): Accessing hidden field Ljava/net/Socket;->impl:Ljava/net/SocketImpl; (light greylist, reflection)
W/m.opencart.sho(24256): Accessing hidden method Ldalvik/system/CloseGuard;->get()Ldalvik/system/CloseGuard; (light greylist, linking)
W/m.opencart.sho(24256): Accessing hidden method Ldalvik/system/CloseGuard;->open(Ljava/lang/String;)V (light greylist, linking)
W/m.opencart.sho(24256): Accessing hidden field Ljava/io/FileDescriptor;->descriptor:I (light greylist, JNI)
W/m.opencart.sho(24256): Accessing hidden method Ljava/security/spec/ECParameterSpec;->setCurveName(Ljava/lang/String;)V (light greylist, reflection)
W/m.opencart.sho(24256): Accessing hidden method Ldalvik/system/BlockGuard;->getThreadPolicy()Ldalvik/system/BlockGuard$Policy; (light greylist, linking)
W/m.opencart.sho(24256): Accessing hidden method Ldalvik/system/BlockGuard$Policy;->onNetwork()V (light greylist, linking)
I/flutter (24256): test3
I/flutter (24256): test1
uj5u.com熱心網友回復：
我還沒有測驗過，但我懷疑錯誤在這里：onTap: onPressed!(),. 改成onTap: () {onPressed!();} ,甚至更好onTap: onPressed,。
轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/412721.html
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