PySide6批量创建控件

最近闲的没事写了个漫画爬虫，但在下载的时候出现了问题，有些漫画100多章还好，有的3000章，这就需要连续创建3000个组件，而在创建组件时会直接卡死主界面。

提供两种解决方法。

1. 多线程

将循环放到其他线程，不在同一个时间点创建

python 复制代码

from PySide6.QtWidgets import QScrollArea, QWidget, QGridLayout, QLabel, QApplication

from collections import deque

from PySide6.QtCore import QThread, Signal


class ListLoadThread(QThread):
    signal = Signal(object, object)  # 函数，参数

    def __init__(self, parent=None):
        super().__init__(parent)
        self.queue = deque()

        self.signal.connect(self._handle_callback)

    def _handle_callback(self, func, item):
        if func:
            func(item)

    def run(self):
        while self.queue:
            items, func = self.queue.popleft()
            for item in items:
                self.msleep(30)
                self.signal.emit(func, item)

    def addItem(self, items: list, func: object):
        self.queue.append((items, func))
        if not self.isRunning():
            self.start()


class ScrollArea(QScrollArea):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.scrollWidget = QWidget()
        self.loadThread = ListLoadThread(self)
        self.startBtn = QPushButton("Start", self)
        self.scrollLayout = QGridLayout(self.scrollWidget)

        self.setWidget(self.scrollWidget)
        self.setWidgetResizable(True)
        self.setViewportMargins(10, 30, 10, 10)
        self.scrollLayout.setAlignment(Qt.AlignmentFlag.AlignTop | Qt.AlignmentFlag.AlignHCenter)

        self.startBtn.clicked.connect(self.start)

    def start(self):
        self.loadThread.addItem([i for i in range(100000)], self.add_item)

    def add_item(self, item):
        label = QLabel(f'Label {item}', self.scrollWidget)
        count = self.scrollLayout.count()
        self.scrollLayout.addWidget(label, count // 6, count % 6)


if __name__ == '__main__':
    app = QApplication([])
    window = ScrollArea()
    window.show()
    app.exec()

2. 异步

试了一下3000个是不卡的，数量再多也是会卡的，超过3000时，还是使用多线程好点

python 复制代码

pip install qasync

python 复制代码

import asyncio
import sys

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QWidget, QApplication, QPushButton, QLabel, QScrollArea, QGridLayout
from qasync import QEventLoop, asyncSlot


class MainWindow(QScrollArea):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.scrollWidget = QWidget()
        self.startBtn = QPushButton("Start", self)
        self.scrollLayout = QGridLayout(self.scrollWidget)

        self.setWidget(self.scrollWidget)
        self.setWidgetResizable(True)
        self.setViewportMargins(10, 30, 10, 10)
        self.scrollLayout.setAlignment(Qt.AlignmentFlag.AlignTop | Qt.AlignmentFlag.AlignHCenter)

        self.startBtn.clicked.connect(self.start_scroll)

    async def add_item(self, item):
        label = QLabel(f'Label {item}', self.scrollWidget)
        count = self.scrollLayout.count()
        self.scrollLayout.addWidget(label, count // 6, count % 6)

    @asyncSlot()
    async def start_scroll(self):
        for i in range(1000):
            await self.add_item(i)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    loop = QEventLoop(app)
    asyncio.set_event_loop(loop)

    window = MainWindow()
    window.show()
    sys.exit(loop.run_forever())