PyQt5Day05--类型判定+对象删除

1、类型判定

（1）总体结构

（2）API操作

 1 from PyQt5.Qt import *
 2 
 3 class Window(QWidget):
 4     def __init__(self):
 5         super().__init__()
 6         self.setWindowTitle("QObject的学习")
 7         self.resize(500, 500)
 8         self.setup_ui()
 9 
10     def setup_ui(self):
11         #self.QObject_ceshi()
12         self.QObject_类型判定()
13 
14     def QObject_类型判定(self):
15         # # *********** 测试API**************开始
16         obj=QObject()
17         w=QWidget()
18         btn=QPushButton()
19         label=QLabel()
20 
21         objs=[obj,w,btn,label]
22         for o in objs:
23             # print(o.isWidgetType())
24             # print(o.inherits('QWidget'))
25             print(o.inherits('QPushBotton'))
26         # *********** 测试API**************结束
27 
28 
29 if __name__ == '__main__':
30     import sys
31 
32     app=QApplication(sys.argv)
33     window=Window()
34     window.show()
35     sys.exit(app.exec_())

（3）案例

 1 from PyQt5.Qt import *
 2 
 3 class Window(QWidget):
 4     def __init__(self):
 5         super().__init__()
 6         self.setWindowTitle("QObject的学习")
 7         self.resize(500, 500)
 8         self.setup_ui()
 9 
10     def setup_ui(self):
11         #self.QObject_ceshi()
12         self.QObject_类型判定()
13 
14     def QObject_类型判定(self):
15         # # *********** 测试API**************开始
16         # obj=QObject()
17         # w=QWidget()
18         # btn=QPushButton()
19         # label=QLabel()
20         # 
21         # objs=[obj,w,btn,label]
22         # for o in objs:
23         #     # print(o.isWidgetType())
24         #     # print(o.inherits('QWidget'))
25         #     print(o.inherits('QPushBotton'))
26         # *********** 测试API**************结束
27         
28         # **************案例*****************开始
29         label = QLabel(self)
30         label.setText("社会社会社会")
31         label.move(100, 100)
32         
33         label2 = QLabel(self)
34         label2.setText("哈哈哈哈")
35         label2.move(150, 150)
36         
37         btn = QPushButton(self)
38         btn.setText("点我")
39         btn.move(200, 200)
40         
41         for widget in self.children():
42             # print(widget)
43             if widget.inherits("QLabel"):
44                 # print("是")
45                 widget.setStyleSheet('background-color:green')
46         # **************案例*****************结束
47 
48 if __name__ == '__main__':
49     import sys
50 
51     app=QApplication(sys.argv)
52     window=Window()
53     window.show()
54     sys.exit(app.exec_())
View Code

2、对象删除

（1）总体框架

（2）API操作

 1 from PyQt5.Qt import *
 2 
 3 class Window(QWidget):
 4     def __init__(self):
 5         super().__init__()
 6         self.setWindowTitle("QObject的学习")
 7         self.resize(500, 500)
 8         self.setup_ui()
 9 
10     def setup_ui(self):
11         #self.QObject_ceshi()
12         self.QObject_对象删除()
13 
14     def QObject_对象删除(self):
15         # *********** 测试API**************开始
16         obj1 = QObject()
17         self.obj1=obj1
18         obj2 = QObject()
19         obj3 = QObject()
20 
21         obj3.setParent(obj2)
22         obj2.setParent(obj1)
23 
24         obj1.destroyed.connect(lambda:print("obj1被释放了"))
25         obj2.destroyed.connect(lambda: print("obj2被释放了"))
26         obj3.destroyed.connect(lambda: print("obj3被释放了"))
27 
28         # del obj2
29         obj2.deleteLater()   # 稍后删除
30         print(obj1.children()) # 先完成再删除
31         # *********** 测试API**************结束

36 
37 if __name__ == '__main__':
38     import sys
39 
40     app=QApplication(sys.argv)
41     window=Window()
42     window.show()
43     sys.exit(app.exec_())

时间：2020-03-03     00:34:44

作者：931935931（QQ）

posted @ 2020-03-03 00:35  红叶楠木  阅读(626)  评论(0)  编辑  收藏  举报