PyQt5多线程刷新界面防假死

ゞ浴缸里的玫瑰 2022-03-11 04:58 513阅读 0赞

在做GUI界面时我们希望后台任务能够与UI分开，在PyQt中，主线程用来重绘界面。而子线程里边的实时处理结果需要反馈到界面，子线程里边不能执行界面更新操作。

## wxpython多线程刷新界面转到 ##

[http://www.omegaxyz.com/2017/10/31/wxpython\_thread\_sendmessage/][http_www.omegaxyz.com_2017_10_31_wxpython_thread_sendmessage]

### 下面给出类Python3+PyQt5多线程防假死动态刷新界面的模板 ###

from PyQt5 import QtWidgets, QtCore
    import sys
    from PyQt5.QtCore import *
    import time
     
     
    # 继承QThread
    class Runthread(QtCore.QThread):
        #  通过类成员对象定义信号对象
        _signal = pyqtSignal(str)
     
        def __init__(self):
            super(Runthread, self).__init__()
     
        def __del__(self):
            self.wait()
     
        def run(self):
            for i in range(100):
                time.sleep(0.2)
                self._signal.emit(str(i))  # 注意这里与_signal = pyqtSignal(str)中的类型相同
     
     
    class Example(QtWidgets.QWidget):
     
        def __init__(self):
            super().__init__()
            # 按钮初始化
            self.button = QtWidgets.QPushButton('开始', self)
            self.button.setToolTip('这是一个 <b>QPushButton</b> widget')
            self.button.resize(self.button.sizeHint())
            self.button.move(120, 80)
            self.button.clicked.connect(self.start_login)  # 绑定多线程触发事件
     
            # 进度条设置
            self.pbar = QtWidgets.QProgressBar(self)
            self.pbar.setGeometry(50, 50, 210, 25)
            self.pbar.setValue(0)
     
            # 窗口初始化
            self.setGeometry(300, 300, 300, 200)
            self.setWindowTitle('OmegaXYZ.com')
            self.show()
     
            self.thread = None  # 初始化线程
     
        def start_login(self):
            # 创建线程
            self.thread = Runthread()
            # 连接信号
            self.thread._signal.connect(self.call_backlog)  # 进程连接回传到GUI的事件
            # 开始线程
            self.thread.start()
     
        def call_backlog(self, msg):
            self.pbar.setValue(int(msg))  # 将线程的参数传入进度条
     
     
    if __name__ == "__main__":
        app = QtWidgets.QApplication(sys.argv)
        myshow = Example()
        myshow.show()
        sys.exit(app.exec_())

### 效果 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h5aXN2_size_16_color_FFFFFF_t_70]  
\*\*更多pyqt5多线程细节参考：\*\*[http://www.omegaxyz.com/2019/03/07/pyqt5-multi-threading/][http_www.omegaxyz.com_2019_03_07_pyqt5-multi-threading]

[http_www.omegaxyz.com_2017_10_31_wxpython_thread_sendmessage]: http://www.omegaxyz.com/2017/10/31/wxpython_thread_sendmessage/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h5aXN2_size_16_color_FFFFFF_t_70]: /images/20220311/97a1d5009f2146748296fd7a57577ab1.png
[http_www.omegaxyz.com_2019_03_07_pyqt5-multi-threading]: http://www.omegaxyz.com/2019/03/07/pyqt5-multi-threading/
[omegaxyz.com]: http://xn--omegaxyz-on6m893d6sgwn0bu73h213a.com