我正在尝试使用 XCode 10 (10A255) 使用 Fastlane 制作我的库的胖二进制文件:
xcodebuild(
workspace: "Mylibrary.xcworkspace",
scheme: "Mylibrary",
configuration: "Release",
clean: true,
archive: true
)
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但是运行lipo -i ~/Mylibrary.framework/Mylibrary我只得到armv7 arm64不能在模拟器上运行的。
有谁知道发生这种情况的原因?
PS:相同的命令适用于 Xcode 9.4 和 lipo -i 打印i386 x86_64 armv7 arm64,效果很好。
我正在使用 NPOI 来操作 Excel(.xlsx) 文件数据和格式。我想知道是否有一种方法可以将单元格范围格式化为表格。
// something like.
ITable table = worksheet.FormatAsTable("A1:C4");
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在互联网上做了一些研究,但还没有运气。任何帮助将非常感激!
我正在开发一个外语应用程序。我的申请中有多项选择题,但完成测试后出现此错误。我想知道是否有人知道这个错误的解决方案。
\n EXCEPTION : 'package:flutter/src/widgets/framework.dart': Failed assertion: line 4263 pos 12: '_debugLifecycleState != _ElementLifecycle.defunct': is not true.\n \nRun Code Online (Sandbox Code Playgroud)\n我的密码
\n class LoadJson extends StatelessWidget {\n @override\n Widget build(BuildContext context) {\n return Scaffold(\n body: FutureBuilder(\n future: DefaultAssetBundle.of(context)\n .loadString("lib/quiz/questions.json"),\n builder: (context, snapshot) {\n List mydata = json.decode(snapshot.data.toString());\n if (mydata == null) {\n return Center(\n child: Text("asld\xc3\xb6asid"),\n );\n } else {\n return SorularinOlacagiPage(mydata: mydata);\n }\n },\n ),\n );\n }\n }\n \n class SorularinOlacagiPage extends StatefulWidget {\n final mydata;\n \n const SorularinOlacagiPage({Key key, …Run Code Online (Sandbox Code Playgroud) 我有日期选择器的简单代码,它禁用所选日期之前的所有日期,但我也需要能够禁用其他日期(例如:17.10.2014 到 19.10.2014)。我怎样才能以禁用特定日期的方式更改它?
public class DatePickerSample extends Application {
private Stage stage;
private DatePicker checkInDatePicker;
private DatePicker checkOutDatePicker;
public static void main(String[] args) {
Locale.setDefault(Locale.US);
launch(args);
}
@Override
public void start(Stage stage) {
this.stage = stage;
stage.setTitle("DatePickerSample ");
initUI();
stage.show();
}
private void initUI() {
VBox vbox = new VBox(20);
vbox.setStyle("-fx-padding: 10;");
Scene scene = new Scene(vbox, 400, 400);
stage.setScene(scene);
checkInDatePicker = new DatePicker();
checkOutDatePicker = new DatePicker();
checkInDatePicker.setValue(LocalDate.now());
final Callback<DatePicker, DateCell> dayCellFactory =
new Callback<DatePicker, DateCell>() {
@Override
public …Run Code Online (Sandbox Code Playgroud) I just updated to flutter version 1.25.0-5.0.pre.92 and I'm getting lots of null-safety related errors in my code which was previously working fine. I have not opted into null safety in any way, all I did was run flutter upgrade, and now it assumes I want to use null safety.
These are the errors:
org-dartlang-app:/pages/lightweight_table/page_lightweight_table.dart:165:81: Error: The parameter 'rowKeys' can't have a value of 'null' because of its type 'List<Key>', but the implicit default value is 'null'.
- 'List' is …Run Code Online (Sandbox Code Playgroud) 当我通过底部导航导航到页面时,页面应用栏被手机通知栏覆盖。
带有底部导航的页面:
没有底部导航的同一页面:
***我需要我的应用程序栏看起来像带有底部导航的第二张图片。当我对底部导航发表评论时,页面恢复正常。
import 'package:flutter/material.dart';
// import 'package:flutter_ecommerce_app/main.dart';
// import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:curved_navigation_bar/curved_navigation_bar.dart';
import 'package:flutter_ecommerce_app/screens/ShoppingCartPage(p).dart';
import 'package:flutter_ecommerce_app/screens/HomeScreen.dart';
import 'package:flutter_ecommerce_app/screens/profilePage.dart';
import 'package:flutter_ecommerce_app/screens/OurStores.dart';
import 'package:flutter_ecommerce_app/screens/NotificationsScreen.dart';
class BottomNavBarWidget extends StatefulWidget {
@override
_BottomNavBarWidgetState createState() => new _BottomNavBarWidgetState();
}
class _BottomNavBarWidgetState extends State<BottomNavBarWidget> {
int currentIndex = 2;
GlobalKey _bottomNavigationKey = GlobalKey();
final List<Widget> viewContainer = [
StoresNearMe(),
notifications(),
HomeScreen(),
CartScreen(),
ProfilePage()
];
@override
Widget build(BuildContext context) {
// void onTap(int index) {
// setState(() {
// currentIndex = index;
// });
// …Run Code Online (Sandbox Code Playgroud) 代码内容并不重要。只有一个问题:当我想离开此页面时,计时器无法处理。当我离开此页面时,sendMessage("message");功能继续运行。有什么选项可以处理这个计时器吗?
Timer timer;
@override
void initState() {
super.initState();
timer = Timer.periodic(new Duration(seconds: 5), (timer) async {
setState(() {
unicode++;
unicodeString = unicode.toString();
if (unicodeString.length < 6) {
int different = 6 - unicodeString.length;
for (var i = 0; i < different; i++) {
unicodeString = "0" + unicodeString;
}
}
sendMessage("meesage");
showSnackBarWithKey("Message Sended !");
});
});
}
@override
void dispose() {
timer.cancel();
super.dispose();
}
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错误如下。
小部件库捕获异常在完成小部件树时抛出以下断言:'package:flutter/src/widgets/framework.dart': 失败的断言: line 4182 pos 12: '_debugLifecycleState != _ElementLifecycle.defunct': is not true 。该断言要么表明框架本身存在错误,要么我们应该在此错误消息中提供更多信息,以帮助您确定并修复根本原因。无论哪种情况,请通过在 …
在我的 ios 应用程序中,我使用flutter tts。它在 Android 上按预期工作,但在 ios 上音量非常低,因为音频来自耳机(而不是扬声器)。因此,音量非常非常低。如何将音频输出切换到扬声器?欢迎任何建议。提前致谢。
这是我的代码:
await flutterTts.setSpeechRate(Platform.android == true ? 0.97 : 0.53);
await flutterTts.speak("I am a Flutter developer");
Run Code Online (Sandbox Code Playgroud) 我正在尝试从远程服务器获取图像。我不断收到此错误:
Warning database has been locked for 0:00:10.000000.
Make sure you always use the transaction object for database operations during a transaction
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之后我的应用程序崩溃了。
Widget carousel = new Container(
height: 200,
child: FutureBuilder<List<String>>(
future: getPropImgs(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return new Carousel(
boxFit: BoxFit.cover,
images: snapshot.data.map((f) {
return new CachedNetworkImage(
imageUrl: f.toString(),
imageBuilder: (context, imageProvider) => Container(
decoration: BoxDecoration(
image: DecorationImage(
image: imageProvider,
fit: BoxFit.cover,
colorFilter:
ColorFilter.mode(Colors.blue, BlendMode.dstIn)),
),
),
placeholder: (context, url) => Center(
child: Container(
height: …Run Code Online (Sandbox Code Playgroud)