当跟着Qt Book的章节QtQuick Controls编写一个ImageViewer，运行时报错：
ERROR: No native FileDialog implementation available.
Qt Labs Platform requires Qt Widgets on this setup.
Add 'QT += widgets' to .pro and create QApplication in main().
尝试过搜索在cmake中引入QWidgets模块，但是无济于事，还是报错。
在google的一段时间无果后，还是回到了官方文档去查看缘由。最终发现了原因：
在官方文档的Qt.labs.platform下面写明了：
A native platform file dialog is currently available on the following platforms:
- Android
- iOS
- Linux (when running with the GTK+ platform theme)
- macOS
- Windows
The Qt Labs Platform module uses Qt Widgets as a fallback on platforms that do not have a native implementation available. Therefore, applications that use types from the Qt Labs Platform module should link to QtWidgets and use QApplication instead of QGuiApplication.
在linux平台只有GTK+的平台才提供了native实现。而我用的是KDE，所以不行。
在KDE中可以使用Quick.Dialog中的FileDialog去实现想要的功能，不过界面可能并不是很美观
还得多看文档!!!!!
标签：available,Qt,implementation,platform,报错,FileDialog,native From： https://www.cnblogs.com/Fortunater/p/17591214.html