PyQt5Day05--类型判定+对象删除

1、类型判定

（1）总体结构

（2）API操作

from PyQt5.Qt import *

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QObject的学习")
        self.resize(500, 500)
        self.setup_ui()

    def setup_ui(self):
        #self.QObject_ceshi()
        self.QObject_类型判定()

    def QObject_类型判定(self):
        # # *********** 测试API**************开始
        obj=QObject()
        w=QWidget()
        btn=QPushButton()
        label=QLabel()

        objs=[obj,w,btn,label]
        for o in objs:
            # print(o.isWidgetType())
            # print(o.inherits('QWidget'))
            print(o.inherits('QPushBotton'))
        # *********** 测试API**************结束


if __name__ == '__main__':
    import sys

    app=QApplication(sys.argv)
    window=Window()
    window.show()
    sys.exit(app.exec_())

（3）案例

from PyQt5.Qt import *

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QObject的学习")
        self.resize(500, 500)
        self.setup_ui()

    def setup_ui(self):
        #self.QObject_ceshi()
        self.QObject_类型判定()

    def QObject_类型判定(self):
        # # *********** 测试API**************开始
        # obj=QObject()
        # w=QWidget()
        # btn=QPushButton()
        # label=QLabel()
        # 
        # objs=[obj,w,btn,label]
        # for o in objs:
        #     # print(o.isWidgetType())
        #     # print(o.inherits('QWidget'))
        #     print(o.inherits('QPushBotton'))
        # *********** 测试API**************结束
        
        # **************案例*****************开始
        label = QLabel(self)
        label.setText("社会社会社会")
        label.move(100, 100)
        
        label2 = QLabel(self)
        label2.setText("哈哈哈哈")
        label2.move(150, 150)
        
        btn = QPushButton(self)
        btn.setText("点我")
        btn.move(200, 200)
        
        for widget in self.children():
            # print(widget)
            if widget.inherits("QLabel"):
                # print("是")
                widget.setStyleSheet('background-color:green')
        # **************案例*****************结束

if __name__ == '__main__':
    import sys

    app=QApplication(sys.argv)
    window=Window()
    window.show()
    sys.exit(app.exec_())

2、对象删除

（1）总体框架

（2）API操作

from PyQt5.Qt import *

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("QObject的学习")
        self.resize(500, 500)
        self.setup_ui()

    def setup_ui(self):
        #self.QObject_ceshi()
        self.QObject_对象删除()

    def QObject_对象删除(self):
        # *********** 测试API**************开始
        obj1 = QObject()
        self.obj1=obj1
        obj2 = QObject()
        obj3 = QObject()

        obj3.setParent(obj2)
        obj2.setParent(obj1)

        obj1.destroyed.connect(lambda:print("obj1被释放了"))
        obj2.destroyed.connect(lambda: print("obj2被释放了"))
        obj3.destroyed.connect(lambda: print("obj3被释放了"))

        # del obj2
        obj2.deleteLater()   # 稍后删除
        print(obj1.children()) # 先完成再删除
        # *********** 测试API**************结束


if __name__ == '__main__':
    import sys

    app=QApplication(sys.argv)
    window=Window()
    window.show()
    sys.exit(app.exec_())

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时间：2020-03-03     00:34:44

作者：931935931（QQ）