fix bug:动态库形式找不到信号，改为子工程

src/SwitchButton.h

@@ -9,7 +9,7 @@
 #include <memory>
 #include <QObject>
 
-class Q_DECL_EXPORT SwitchButton : public QWidget
+class SwitchButton : public QWidget
 {
     Q_OBJECT
 public:

switchbutton.pri

@@ -1,9 +1,8 @@
-INCLUDEPATH += $$PWD/
+INCLUDEPATH += $$PWD/src
 
-#SOURCES += \
+SOURCES += \
-#    $$PWD/SwitchButton.cpp
+    $$PWD/src/SwitchButton.cpp
 
 HEADERS += \
-    $$PWD/SwitchButton.h
+    $$PWD/src/SwitchButton.h
 
-LIBS += -L. SwitchButton