每当我尝试使用Xcode 11生成C ++程序并输入以下行时:
class TwitterTabBare extends StatefulWidget {
@override
_TwitterTabBareState createState() => _TwitterTabBareState();
}
class _TwitterTabBareState extends State<TwitterTabBare>
with SingleTickerProviderStateMixin {
TabController _tabController;
@override
void initState() {
super.initState();
_tabController = TabController(length: 4, vsync: this);
}
@override
Widget build(BuildContext context) {
double screenHeight = MediaQuery.of(context).size.height;
return column(
children: <Widget>[
TabBar(
controller: _tabController,
labelColor: Colors.blue,
unselectedLabelColor: Colors.grey[700],
tabs: <Widget>[
Tab(
text: 'Tweets',
),
Tab(
text: 'Replies',
),
Tab(
text: 'Media',
),
Tab(
text: 'Tweets',
),
],
),
Container(
constraints: BoxConstraints.expand(height: 300),
child: TabBarView(
controller: _tabController,
children: <Widget>[
// CardPage(),
Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
Text('Tweets & replies'),
],
),
Text('Replies'),
Text('Media'),
Text('Likes'),
],
),
),
],
);
}
}
显示一条错误消息“找不到'iostream'文件。我正在使用的库是libc ++,而不是libstdc ++。
其他人似乎没有遇到此问题,所以我不知道发生了什么。
#include <iostream>
答案 0 :(得分:2)
在将C ++类与Objective-C包装器一起使用时,我们遇到了相同的问题。
在检查构建命令时,我们发现Xcode传递了Objective-c作为clang的语言。将Wrapper文件扩展名更改为'.mm'时,XCode开始将语言作为Objective-C ++传递,并且错误消失了。
答案 1 :(得分:0)
我遇到了完全相同的问题。确实有lot个人这样做。我尝试重新安装Xcode,但错误仍然存在。唯一有用的是用brew update
更新所有内容。
答案 2 :(得分:0)
我在终端中运行了以下命令:
xcode-select --install
在安装过程结束时,我退出并重新打开Xcode,问题消失了。
答案 3 :(得分:0)
尝试添加头文件路径:
构建设置->搜索路径->系统标题搜索路径
添加:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c ++ / v1 /
答案 4 :(得分:0)
我终于能够避免此错误,这就是我所做的。
EquipmentType
xcode-select --install
代替:
#include "/Library/Developer/CommandLineTools/usr/include/c++/v1/iostream"