PySide6 GUI 编程（7）：QLabel的使用

QLabel 的简单使用

字符展示

设置字体大小并展示

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QApplication, QLabel, QMainWindow
class LabelFont(QMainWindow):
    def __init__(self):
        super().__init__()
        label = QLabel()
        label.setText('你好，PySide6！\n\nHello,     PySide6!')
        label.setAlignment(Qt.AlignmentFlag.AlignHCenter | Qt.AlignmentFlag.AlignVCenter)
        my_font = label.font()
        my_font.setPointSize(25)
        label.setFont(my_font)
        self.setWindowTitle('Label 字体大小设置')
        self.setCentralWidget(label)
        self.setFixedWidth(800)
        self.setFixedHeight(400)
if __name__ == '__main__':
    app = QApplication()
    ins = LabelFont()
    ins.show()
    app.exec()

实现效果

运行效果

展示图片

QLabel 展示静态图片并设置图片自适应大小

from PySide6.QtCore import QSize, Qt
from PySide6.QtGui import QPixmap
from PySide6.QtWidgets import QApplication, QLabel, QMainWindow
class LabelPixmap(QMainWindow):
    def __init__(self):
        super().__init__()
        my_label = QLabel()
        my_pixmap = QPixmap('./PySide6 Q\'Widget 类.png')
        # 指定图片的尺寸大小
        scaled = my_pixmap.scaled(QSize(800, 800),
                                  Qt.AspectRatioMode.KeepAspectRatio,
                                  Qt.TransformationMode.SmoothTransformation)
        my_label.setPixmap(scaled)
        # 内容随着 label 尺寸的变化而进行变化展示
        my_label.setScaledContents(True)
        my_label.setAlignment(Qt.AlignmentFlag.AlignVCenter | Qt.AlignmentFlag.AlignHCenter)
        self.setWindowTitle('设置 label pix map')
        self.setCentralWidget(my_label)
if __name__ == '__main__':
    app = QApplication()
    ins = LabelPixmap()
    ins.show()
    app.exec()

实现效果

运行效果

简单的与输入框联动

代码实现

import hashlib
from PySide6.QtWidgets import QApplication, QLabel, QLineEdit, QMainWindow, QVBoxLayout, QWidget
class InputToLabel(QMainWindow):
    def __init__(self):
        super().__init__()
        self.input = QLineEdit()
        self.label_content = QLabel()
        self.label_parse_ret = QLabel()
        self.input.textChanged.connect(self.hash_test)
        self.input.textChanged.connect(self.parse_test)
        layout_1 = QVBoxLayout()
        layout_1.addWidget(self.input)
        layout_1.addWidget(self.label_content)
        layout_1.addWidget(self.label_parse_ret)
        container = QWidget()
        container.setLayout(layout_1)
        self.setCentralWidget(container)
    def parse_test(self, data: str):
        self.label_parse_ret.setText('字符个数:{}，字节长度:{}'.format(
            len(data),
            len(data.encode('utf-8'))
    def hash_test(self, data: str):
        self.label_content.setText(
            hashlib.sha256(data.encode('utf-8')).hexdigest()