访问列表中的特定按钮

Question

我正在尝试为我的程序制作 GUI，但在尝试从点击的 QPushButton 访问文本时遇到了问题。

问题是，当我使用 for 循环遍历按钮列表时，button.clicked.connect(function) 将每次点击都视为对最后一项的点击（至少，我认为是这样）。

这里是示例代码

from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QPushButton, QHBoxLayout
import sys


def main():
    app = QApplication(sys.argv)

    # main window
    win = QMainWindow()
    win.setGeometry(100, 100, 460, 80)
    win.setWindowTitle("My great app")

    # layout
    box = QWidget(win)
    box.setGeometry(0, 0, 460, 80)
    layout = QHBoxLayout(win)
    box.setLayout(layout)

    btns = []

    # creating 10 buttons
    for i in range(10):
        btn = QPushButton(str(i+1), box)
        btns.append(btn)
        layout.addWidget(btns[i], i)

    # accessing buttons text
    for btn in btns:
        btn.clicked.connect(lambda: print(btn.text()))

    win.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

如果您运行程序并单击任何按钮，它每次都会打印“10”。

Answer 1

你应该在这里阅读https://doc.qt.io/qt-5/qmainwindow.html#details和这里https://doc.qt.io/qt-5/qabstractbutton.html#clicked

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, \
    QPushButton, QHBoxLayout


def main():
    app = QApplication(sys.argv)

    # main window
    win = QMainWindow()
    win.setGeometry(100, 100, 460, 80)
    win.setWindowTitle("My great app")

    # layout
    box = QWidget()                               #(win)
    box.setGeometry(0, 0, 460, 80)
    layout = QHBoxLayout(box)                     #(win)
#    box.setLayout(layout)                        # ---
    win.setCentralWidget(box)                     # +++

    btns = []

    # creating 10 buttons
    for i in range(10):
        btn = QPushButton(str(i+1)) #, box)
        btns.append(btn)
        layout.addWidget(btns[i], i)

    # accessing buttons text
#       btn.clicked.connect(lambda: print(btn.text()))                 # ---
        btn.clicked.connect(lambda ch, text=btn.text(): print(text))   # +++

    win.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()