No Such Slot Qt

自定义槽 No such slot
  1. Qt No Such Slot In Derived Class
  2. No Such Slot Qt 8
  3. Qt No Such Slot Qobject
  4. No Such Slot Qt 100
  5. No Such Slot Qt 12
  6. No Such Slot Qt Saucepan

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诸位好。最近在做qt，自定义槽的时候，出现如下错误。先把代码贴出了，请各位老师，过目。
头文件：mainwindow.h
C/C++ code

No Such Slot Qt源文件：mainwindow.cpp
C/C++ code

main.cpp文件
C/C++ code

运行能出现界面，但是提示如下信息：
D:ifnpftpGuiftpGui-build-desktopdebugftpGui.exe 启动中...
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..ftpGuimainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_0')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..ftpGuimainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_1')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..ftpGuimainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_2')Slot
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..ftpGuimainwindow.cpp:23
Object::connect: (sender name: 'lineEdit_3')
Object::connect: (receiver name: 'centralWidget')
Object::connect: No such slot QWidget::this->inputFinish(edit->text(),i) in ..ftpGuimainwindow.cpp:23Slot
Object::connect: (sender name: 'lineEdit_4')

Qt No Such Slot In Derived Class


请诸位老师，错在哪里？

No Such Slot Qt 8

------解决方案--------------------
必然出错！！！
你没有理解好this
connect(edit,SIGNAL(editingFinished()),this,SLOT(this->inputFinish(edit->text(),i)));

Qt No Such Slot Qobject

你的槽函数是定义在MainWindow 这个类中，所以接受者应该是this

No Such Slot Qt 100


而且我没有看错的话，你写的是centralWidget()，是个函数啊这个函数我在MainWindow 里面也没有找到，这么写有点莫名其妙，接受者不可以是函数

No Such Slot Qt 12


No Such Slot Qt Saucepan

------解决方案--------------------