PyQt5 图 canvas 不拉伸

Question

问题是我的 FigureCanvas 没有采用所有可能的高度，它只是调整其宽度。调整 main window 后出现问题。我想让 canvas 占用最大可用高度。

这是现在的样子

这是最小的可重现示例：

import sys
import os
from PyQt5 import QtCore, QtWidgets, QtGui
from PyQt5.QtGui import (QPixmap, QPainter, QBrush, QPen, QColor)
from PyQt5.QtCore import *
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt5agg import NavigationToolbar2QT as NavigationToolbar
from PyQt5.QtWidgets import *
import matplotlib
from matplotlib import pyplot as plt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Distributions")
        self.setMinimumSize(480, 320)

        # Layout
        mainLayout = QVBoxLayout()
        dirLayout = QHBoxLayout()
        radioLayout = QHBoxLayout()
        canvasLayout = QVBoxLayout()

        # Setting main Widget
        self.mainWidget = QWidget()
        self.setCentralWidget(self.mainWidget)
        self.mainWidget.setLayout(mainLayout)
 

        # Setting canvas to plot
        mainLayout.addLayout(canvasLayout)
        figure = plt.figure()
        canvas = FigureCanvas(figure)

        toolbar = NavigationToolbar(canvas, self)
        canvasLayout.addWidget(toolbar)
        canvasLayout.addWidget(canvas)
        
        plotButton = QPushButton('Plot')
        canvasLayout.addWidget(plotButton, 
        alignment=QtCore.Qt.AlignCenter)
        plotButton.setMaximumSize(QSize(80, 60))
        
app = QApplication(sys.argv)
dialogi = MainWindow()
dialogi.show()
sys.exit(app.exec_())

Answer 1

将小部件添加到布局时必须设置拉伸因子：

canvasLayout.addWidget(canvas, stretch=1)

PyQt5 图 canvas 不拉伸

PyQt5 figure canvas doesnt stretch

python

pyqt

pyqt5