关联信号报错error: no matching member function for call to 'connect'

 关联一个信号报错（这个信号名称相同，数量有2个或以上，但是参数不同），此时就会报错如下：

error: no matching member function for call to 'connect'
 candidate function not viable: no overload of 'buttonToggled' matching 'const char *' for 2nd argument
candidate function not viable: no overload of 'buttonToggled' matching 'const QMetaMethod' for 2nd argument
andidate function not viable: no overload of 'buttonToggled' matching 'const char *' for 2nd argument
candidate template ignored: couldn't infer template argument 'Func1'
candidate template ignored: couldn't infer template argument 'Func1'
candidate template ignored: couldn't infer template argument 'Func1'
candidate function template not viable: requires 3 arguments, but 4 were provided
candidate function template not viable: requires 3 arguments, but 4 were provided

根据上面报错分析，不知道关联的哪个信号（毕竟这个信号名称相同有2个，仅仅参数不同而已）

解决办法：构造函数指针，指定明确的信号函数