Python|Python Pyqt5多线程更新UI代码实例(防止界面卡死) PythonPyqt5多线程更新UI代码实例

"""
在编写GUI界面中，通常用会有一些按钮，点击后触发事件，
比如去下载一个文件或者做一些操作，
这些操作会耗时，如果不能及时结束，主线程将会阻塞，
这样界面就会出现未响应的状态，因此必须使用多线程来解决这个问题。
"""
代码实例

from PyQt5.Qt import (QApplication, QWidget, QPushButton,QThread,QMutex,pyqtSignal)import sysimport time qmut_1 = QMutex() # 创建线程锁qmut_2 = QMutex()qmut_3 = QMutex()# 继承QThreadclass Thread_1(QThread):# 线程1def __init__(self):super().__init__() def run(self):qmut_1.lock() # 加锁values = [1, 2, 3, 4, 5,6,7,8,9,10]print("====Thread_1====")for i in values:print("Thread_1:",i)time.sleep(0.5)# 休眠qmut_1.unlock() # 解锁 class Thread_2(QThread):# 线程2_signal =pyqtSignal()def __init__(self):super().__init__() def run(self):# qmut_2.lock()# 加锁values = ["a", "b", "c", "d", "e","f","g","h","i","j","k"]print("====Thread_2====")for i in values:print("Thread_2:",i)time.sleep(0.5)# qmut_2.unlock()# 解锁self._signal.emit() class Thread_3(QThread):# 线程2_signal =pyqtSignal()def __init__(self):super().__init__() def run(self):qmut_3.lock()# 加锁values = ["a", "b", "c", "d", "e","f","g","h","i","j","k"]print("====Thread_3====")for i in values:print("Thread_3:",i)time.sleep(0.5)qmut_3.unlock()# 解锁self._signal.emit() #执行完毕后，释放信号 class Thread_01(QThread):# 线程1def __init__(self):super().__init__() def run(self):values = [1, 2, 3, 4, 5]print("====Thread_01====")for i in values:print("Thread_01:",i)time.sleep(0.5)# 休眠 class Thread_02(QThread):# 线程2def __init__(self):super().__init__() def run(self):values = ["a", "b", "c", "d", "e"]print("====Thread_02====")for i in values:print("Thread_02:",i)time.sleep(0.5) class MyWin(QWidget):def __init__(self):super().__init__()# 按钮初始化self.btn_01 = QPushButton('按钮_每点一次运行一次', self)self.btn_01.move(80, 40)self.btn_01.clicked.connect(self.click_01)# 绑定槽函数 self.btn_02 = QPushButton('按钮_每点一次运行一次', self)self.btn_02.move(80, 80)self.btn_02.clicked.connect(self.click_02)# 绑定槽函数 self.btn_1 = QPushButton('按钮_线程锁_多次点击，依次执行(滞后感)', self)self.btn_1.move(80, 120)self.btn_1.clicked.connect(self.click_1)# 绑定槽函数 self.btn_2 = QPushButton('按钮_线程锁_收到完成信号后才能再次点击', self)self.btn_2.move(80, 160)self.btn_2.clicked.connect(self.click_2)# 绑定槽函数 self.btn_3 = QPushButton('按钮_线程锁_收到完成信号后再次执行', self)self.btn_3.move(80, 200)self.btn_3.clicked.connect(self.click_3)# 绑定槽函数 def click_01(self):self.thread_01 = Thread_01()# 创建线程self.thread_01.start()# 开始线程def click_02(self):self.thread_02 = Thread_02()# 创建线程self.thread_02.start()# 开始线程 def click_1(self):self.thread_1 = Thread_1()# 创建线程self.thread_1.start()# 开始线程 def click_2(self):self.btn_2.setEnabled(False)self.thread_2 = Thread_2()self.thread_2._signal.connect(self.set_btn_2) #信号连接，如果收到信号，就执行对应的函数self.thread_2.start() def click_3(self):self.btn_3.setEnabled(False)self.thread_3 = Thread_3()self.thread_3._signal.connect(self.set_btn_3) #信号连接，如果收到信号，就执行对应的函数self.thread_3.start() def set_btn_2(self):self.btn_2.setEnabled(True) def set_btn_3(self):self.btn_3.setEnabled(True) if __name__ == "__main__":app = QApplication(sys.argv)myshow = MyWin()myshow.setWindowTitle("多线程演示")myshow.setMinimumHeight(500)myshow.setMinimumWidth(500)myshow.show()sys.exit(app.exec_())

运行结果

====Thread_01====
Thread_01: 1
Thread_01: 2
Thread_01: 3
Thread_01: 4
Thread_01: 5
====Thread_02====
Thread_02: a
Thread_02: b
Thread_02: c
Thread_02: d
Thread_02: e
====Thread_1====
Thread_1: 1
Thread_1: 2
Thread_1: 3
Thread_1: 4
Thread_1: 5
Thread_1: 6
Thread_1: 7
Thread_1: 8
Thread_1: 9
====Thread_2====
Thread_2: a
Thread_1: 10
Thread_2: b
Thread_2: c
Thread_2: d
====Thread_3====
Thread_3: a
Thread_2: e
Thread_3: b
Thread_2: f
Thread_3: c
Thread_2: g
Thread_3: d
Thread_2: h
Thread_3: e
Thread_2: i
Thread_3: f
Thread_2: j
Thread_3: g
Thread_2: k
Thread_3: h

运行过程

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