PyQt5 figurecanvas 不拉伸

Question

问题是我的 FigureCanvas 没有采用所有可能的高度，它只是调整它的宽度。调整主窗口大小后会出现此问题。我想让画布占据最大可用高度。

这就是现在的样子

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

您必须在将小部件添加到布局时设置拉伸因子：

canvasLayout.addWidget(canvas, stretch=1)