参考链接：PyQt - 使用多线程避免界面卡顿_bailang_zhizun的博客-CSDN博客_pyqt界面卡死
代码1：
#!/usr/bin/python # coding:UTF-8 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(0.1) 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(Example, self).__init__() # 按钮初始化 self.button = QtWidgets.QPushButton('开始', self) 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.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_())
代码2：
#!/usr/bin/python # coding:UTF-8 from PyQt5 import QtWidgets, QtCore import sys from PyQt5.QtCore import * import time # 继承 QObject class Runthread(QtCore.QObject): # 通过类成员对象定义信号对象 signal = pyqtSignal(str) def __init__(self): super(Runthread, self).__init__() self.flag = True def __del__(self): print ">>> __del__" def run(self): i = 0 while self.flag: time.sleep(1) if i <= 100: self.signal.emit(str(i)) # 注意这里与_signal = pyqtSignal(str)中的类型相同 i += 1 print ">>> run end: " class Example(QtWidgets.QWidget): # 通过类成员对象定义信号对象 _startThread = pyqtSignal() def __init__(self): super(Example, self).__init__() # 按钮初始化 self.button_start = QtWidgets.QPushButton('开始', self) self.button_stop = QtWidgets.QPushButton('停止', self) self.button_start.move(60, 80) self.button_stop.move(160, 80) self.button_start.clicked.connect(self.start) # 绑定多线程触发事件 self.button_stop.clicked.connect(self.stop) # 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.show() self.myT = Runthread() # 创建线程对象 self.thread = QThread(self) # 初始化QThread子线程 # 把自定义线程加入到QThread子线程中 self.myT.moveToThread(self.thread) self._startThread.connect(self.myT.run) # 只能通过信号-槽启动线程处理函数 self.myT.signal.connect(self.call_backlog) def start(self): if self.thread.isRunning(): # 如果该线程正在运行，则不再重新启动 return # 先启动QThread子线程 self.myT.flag = True self.thread.start() # 发送信号，启动线程处理函数 # 不能直接调用，否则会导致线程处理函数和主线程是在同一个线程，同样操作不了主界面 self._startThread.emit() def stop(self): if not self.thread.isRunning(): # 如果该线程已经结束，则不再重新关闭 return self.myT.flag = False self.stop_thread() def call_backlog(self, msg): self.pbar.setValue(int(msg)) # 将线程的参数传入进度条 def stop_thread(self): print ">>> stop_thread... " if not self.thread.isRunning(): return self.thread.quit() # 退出 self.thread.wait() # 回收资源 print ">>> stop_thread end... " if __name__ == "__main__": app = QtWidgets.QApplication(sys.argv) myshow = Example() myshow.show() sys.exit(app.exec_())
