极客教程PyQt5 – 数字秒表
在这篇文章中，我们将看到如何使用Python GUI–PyQt5创建一个停表。
秒表 是一种手持式计时器，旨在测量其启动和停止之间的时间量。为远距离观看而设计的大型数字版秒表，如在体育场馆中，被称为停表。
创建秒表的步骤 –
- 创建一个标志着秒数的计数器
-
创建一个标志，以知道何时开始，何时暂停，将其设置为假
-
创建标签以显示秒数
-
创建三个按钮，用于启动秒表、暂停秒表和重新设置秒表
-
给每个按钮添加动作。
-
在启动按钮的动作中，将标志设为真
-
在暂停按钮的动作中，将标志设为假
-
在复位按钮的动作中，使标志为假，并使计数器的值为0
-
创建QTimer对象，每隔100毫秒即第10秒调用一个方法
- 在QTimer对象的方法中检查标志状态，如果它是真的，则增加计数器
- 使用setText方法通过标签显示计数器的值。
下面是实现方法
# importing libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("Python Stop watch")
# setting geometry
self.setGeometry(100, 100, 400, 500)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for widgets
def UiComponents(self):
# counter
self.count = 0
# creating flag
self.flag = False
# creating a label to show the time
self.label = QLabel(self)
# setting geometry of label
self.label.setGeometry(75, 100, 250, 70)
# adding border to the label
self.label.setStyleSheet("border : 4px solid black;")
# setting text to the label
self.label.setText(str(self.count))
# setting font to the label
self.label.setFont(QFont('Arial', 25))
# setting alignment to the text of label
self.label.setAlignment(Qt.AlignCenter)
# creating start button
start = QPushButton("Start", self)
# setting geometry to the button
start.setGeometry(125, 250, 150, 40)
# add action to the method
start.pressed.connect(self.Start)
# creating pause button
pause = QPushButton("Pause", self)
# setting geometry to the button
pause.setGeometry(125, 300, 150, 40)
# add action to the method
pause.pressed.connect(self.Pause)
# creating reset button
re_set = QPushButton("Re-set", self)
# setting geometry to the button
re_set.setGeometry(125, 350, 150, 40)
# add action to the method
re_set.pressed.connect(self.Re_set)
# creating a timer object
timer = QTimer(self)
# adding action to timer
timer.timeout.connect(self.showTime)
# update the timer every tenth second
timer.start(100)
# method called by timer
def showTime(self):
# checking if flag is true
if self.flag:
# incrementing the counter
self.count+= 1
# getting text from count
text = str(self.count / 10)
# showing text
self.label.setText(text)
def Start(self):
# making flag to true
self.flag = True
def Pause(self):
# making flag to False
self.flag = False
def Re_set(self):
# making flag to false
self.flag = False
# resetting the count
self.count = 0
# setting text to label
self.label.setText(str(self.count))
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())
Python