Python PyQt5在QThread上为QPushButton加载图像

Question

所以我有一个加载大量按钮的UI，所有按钮都带有Images，问题是，它需要很长的时间，所以我试着把它放在QThread中，我让它工作，但没有速度差异，所以我尝试了不同的解决方案，但现在线程无法启动。

代码：

import sys
import os
from PyQt5 import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui, QtPrintSupport, QtWidgets, uic
# I've tried using a QThread for this, but it still took the same amount of time.
class LoadImageThumbnailshread(QThread):
def __init__(self, listButtons, listPaths):
QThread.__init__(self)
self.listButtons = listButtons
self.listPaths = listPaths
def run(self):
self.process_images_Thread()
def process_images_Thread(self):
for i, j in enumerate(self.listButtons):
j.setIcon(QIcon(self.listPaths[i]))
j.setIconSize(QSize(150-6, 60-6))

class App(QDialog):
def __init__(self):
super().__init__()
self.title = 'PyQt5 layout - pythonspot.com'
self.left = 10
self.top = 10
self.width = 320
self.height = 100
self.images_path = []
self.button_images = []
self.initUI()
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.createGridLayout()
windowLayout = QVBoxLayout()
windowLayout.addWidget(self.horizontalGroupBox)
self.setLayout(windowLayout)
self.show()
def createGridLayout(self):
self.horizontalGroupBox = QGroupBox("Grid")
layout = QGridLayout()
layout.setColumnStretch(1, 4)
layout.setColumnStretch(2, 4)
for i in range(100):
self.btnImage = QPushButton()
self.btnImage.setObjectName('btnImage')
self.images_path.append(os.path.dirname(
os.path.abspath(__file__)) + 'view.png')
# ! I have also tried using Pixmaps with Clickable labels, but it made no diffrence.
# pixmap = QPixmap(os.path.dirname(os.path.abspath(__file__)) + image_locations[i])
# pixmap = pixmap.scaled(60, 300, Qt.KeepAspectRatio, Qt.FastTransformation)
# self.btnImage.setPixmap(pixmap)
# ! Enableing this loads the images, but very slowly
# self.btnImage.setIcon(QIcon(os.path.dirname(os.path.abspath(__file__)) + '/view.png'))
# self.btnImage.setIconSize(QSize(150-6, 60-6))
self.button_images.append(self.btnImage)
layout.addWidget(self.btnImage, i, 0)
# ! This starts the QThread
converter = LoadImageThumbnailshread(
self.button_images, self.images_path)
converter.start()
self.horizontalGroupBox.setLayout(layout)

if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())

因此，为了解释我想要的更多内容，我想在加载UI后启动QThread，QThread将把所有图像加载到每个按钮上。问题是：它现在不起作用。

我遇到的另一个问题是，当我得到QThread时，UI等待它完成，然后所有东西都突然弹出。我希望QThread是完全独立的，如果你愿意的话，可以看到所有的图像一个接一个地加载。

Answer 1

线程不用于加速任何任务，但执行不阻塞任何线程的任务。给定以上，如果我有n"；任务"；并且每一个都在"0"中执行；n〃；那么线程的总执行时间将是1个任务，也就是说，没有任务被加速，而是任务被重新分配。总之：如果您想加快任务的速度，那么线程不是默认选项，因为它取决于应用程序。

另一方面，图像的加载不消耗时间，但是存在许多消耗很少时间的任务，这些任务总共相当于消耗大量时间的任务并且不幸的是，由于GUI的元素不是线程安全的，所以该任务不能在另一个线程或进程中执行。

一种解决方法是，负载是每T秒由n个元素组成的一小组，因此整个任务将被分配，用户不会观察到任何滞后的影响。

import os
import sys
from PyQt5.QtCore import QSize, QTimer
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import (
QApplication,
QDialog,
QGridLayout,
QGroupBox,
QPushButton,
QVBoxLayout,
)

class App(QDialog):
def __init__(self):
super().__init__()
self.title = "PyQt5 layout - pythonspot.com"
self.left = 10
self.top = 10
self.width = 320
self.height = 100
self.images_path = []
self.button_images = []
self.initUI()
def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)
self.createGridLayout()
windowLayout = QVBoxLayout(self)
windowLayout.addWidget(self.horizontalGroupBox)
self._iter = iter(range(100))
self._timer = QTimer(interval=10, timeout=self.lazy_loading)
self._timer.start()
def createGridLayout(self):
self.horizontalGroupBox = QGroupBox("Grid")
self.grid_layout = QGridLayout()
self.grid_layout.setColumnStretch(1, 4)
self.grid_layout.setColumnStretch(2, 4)
self.horizontalGroupBox.setLayout(self.grid_layout)
def lazy_loading(self):
try:
i = next(self._iter)
except StopIteration:
self._timer.stop()
else:
btn = QPushButton()
image_path = os.path.join(os.path.abspath(__file__), "view.png")
btn.setIcon(QIcon(image_path))
btn.setIconSize(QSize(150 - 6, 60 - 6))
self.grid_layout.addWidget(btn, i, 0)

if __name__ == "__main__":
app = QApplication(sys.argv)
ex = App()
ex.show()
sys.exit(app.exec_())