PyQt5 QLineEdit校验器限制输入实例代码

from PyQt5.QtWidgets import *
from PyQt5.QtGui import QIntValidator, QDoubleValidator, QRegExpValidator
from PyQt5.QtCore import QRegExp
import sys

class QLineEditorValidator(QWidget):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def init_ui(self):
        self.setWindowTitle("校验器")
        form_layout = QFormLayout()
        int_line = QLineEdit()
        double_line = QLineEdit()
        re_line = QLineEdit()
        int_line.setPlaceholderText("整形数据")
        double_line.setPlaceholderText("浮点数据")
        re_line.setPlaceholderText("正则数据")
        form_layout.addRow("整形数据", int_line)
        form_layout.addRow("浮点数据", double_line)
        form_layout.addRow("正则数据", re_line)

        int_validator = QIntValidator()
        int_validator.setRange(1, 10)

        double_validator = QDoubleValidator()
        double_validator.setRange(-360, 360)
        double_validator.setDecimals(2)

        re_validator = QRegExpValidator()
        reg = QRegExp("^[a-zA-Z0-9]+$")
        re_validator.setRegExp(reg)

        int_line.setValidator(int_validator)
        double_line.setValidator(double_validator)
        re_line.setValidator(re_validator)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = QLineEditorValidator()
    win.show()
    sys.exit(app.exec_())

def validate(self, input_str, input_int):
        # input_str是输入的内容
        # input_int是光标的位置
        ....

from PyQt5.Qt import *
import sys

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("验证器的使用")
        self.resize(500, 500)
        self.setup_ui()

    def setup_ui(self):
        le = QLineEdit()
        le.move(100, 100)
        # 18-180
        # QValidator不能直接用，而是用一个子类来继承，然后实体化
        # 因此上面写了一个新的AgeValidator继承于QValidator
        validator1 = ScoreValidator()
        le.setValidator(validator1)

        le2 = QLineEdit()
        le2.move(200, 200)
        fm_layout = QFormLayout(self)
        fm_layout.addRow("输入年龄", le)
        fm_layout.addRow("打酱油行", le2)

class ScoreValidator(QValidator):
    def validate(self, input_str, input_int):
        # input_str: 输入框中的已有内容
        # input_int: 光标的位置
        print(f"当前数值是:{input_str}, 是第{input_int}个字符")

        try:
            if 60 <= int(input_str) <= 100:
                # 需要有一个返回值
                return QValidator.Acceptable, input_str, input_int  # 返回验证通过
            elif 5 <= int(input_str) < 60:
                return QValidator.Intermediate, input_str, input_int  # 返回验证中间状态，不做响应
            else:
                return QValidator.Invalid, input_str, input_int  # 返回验证不通过
        except:
            if len(input_str) == 0:
                return QValidator.Intermediate, input_str, input_int  # 返回验证中间状态，不做响应
            return QValidator.Invalid, input_str, input_int  # 返回验证不通过

# 方便在模板里进行调试
if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())