本篇讲解PyQt中预置的5种消息对话框：
- QMessageBox.about 关于
- QMessageBox.ctitical危险
- QMessageBox.information 信息框
- QMessageBox.question 询问框
- QMessageBox.warning 警告
具体的运用详见代码:
代码语言：javascript复制import sys
from PyQt5.QtWidgets import *
class App(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.setWindowTitle("PyQt5 消息对话框")
vlayout =QVBoxLayout()
bt1 = QPushButton("about 对话框")
bt2 = QPushButton("critical 对话框")
bt2_ = QPushButton("information 对话框")
bt3 = QPushButton("question 对话框")
bt4 = QPushButton("warning 对话框")
vlayout. addWidget(bt1)
vlayout. addWidget(bt2)
vlayout. addWidget(bt2_)
vlayout. addWidget(bt3)
vlayout. addWidget(bt4)
self.setLayout(vlayout)
bt1.clicked.connect(self.about_dlg)
bt2.clicked.connect(self.critical_dlg)
bt2_.clicked.connect(self.info_dlg)
bt3.clicked.connect(self.question_dlg)
bt4.clicked.connect(self.warning_dlg)
self.resize(200,200)
def about_dlg(self):
reply = QMessageBox.about(self, "about 对话框 标题", "关于消息 内容")
#about (QWidget parent, QString caption, QString text)
#print(reply) # QMessageBox.about()返回None
def critical_dlg(self):
reply = QMessageBox.critical(self, "critical 对话框 标题", "危险消息 内容")
#print(reply)
#print (reply == QMessageBox.Ok)
def info_dlg(self):
reply = QMessageBox.information(self, "information 对话框 标题", "信息 内容n新年快乐！")
#print(reply)
#print (reply == QMessageBox.Ok)
def question_dlg(self):
reply = QMessageBox.question(self, "information 对话框 标题", "询问 内容n你是猴子派来的吗？",
QMessageBox.Yes | QMessageBox.No | QMessageBox.Cancel)
#点右上角的叉关闭对话框，则相当于点最后一个按钮（默认为 “cancle”）
if reply == QMessageBox.Yes:
print("Yes")
elif reply == QMessageBox.No:
print("No")
elif reply == QMessageBox.Cancel:
print("Cancled")
def warning_dlg(self):
reply = QMessageBox.warning(self, "warning 对话框 标题", "警告消息 内容")
#print(reply)
#print (reply == QMessageBox.Ok)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
ex.show()
sys.exit(app.exec_())
