Python Pyqt5多线程更新UI代码实例(防止界面卡死)_开发_开发者

"""

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 sys
import time
 
qmut_1 = QMutex() # 创建线程锁
qmut_2 = QMutex()
qmut_3 = QMutex()
# 继承QThread
class Thread_1(QThread):  # 线程1
    def __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_2wyadO:",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1
    def __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2
    def __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_wyadO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编程客栈.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_bt编程客栈n_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

==== www.cppcns.comThread_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