窗口小部件水平和标签集中到这些小部件

Question

的左侧有一些小部件水平居中：

class TestWidget(QWidget): 

    def __init__(self): 
     super().__init__() 
     self._init_ui() 

    def _init_ui(self): 
     edit1_label = QLabel("Edit1") 
     edit2_label = QLabel("Edit2") 
     edit3_label = QLabel("Edit3") 
     edit1 = QLineEdit() 
     edit2 = QLineEdit() 
     edit3 = QLineEdit() 

     layout = QVBoxLayout() 
     layout.addWidget(edit1) 
     layout.addWidget(edit2) 
     layout.addWidget(edit3) 
     layout.addStretch() 

     hlayout = QHBoxLayout() 
     hlayout.addLayout(layout) 
     self.setLayout(hlayout) 
     self.setAttribute(Qt.WA_StyledBackground) 


def _main(): 
    app = QApplication(['']) 
    app.setStyleSheet(""" 
        TestWidget { 
         min-height: 400px; 
         max-height: 400px; 
         min-width: 600px; 
         max-width: 600px; 
        } 
        TestWidget QLineEdit { 
         min-height: 2em; 
         max-height: 2em; 
         min-width: 20em; 
         max-width: 20em; 
         } 
        """) 
w = TestWidget() 
w.show() 
app.exec_() 

我想标签（edit1_label，edit2_label，edit3_label）的地方进行编辑的左（EDIT1， edit2，edit3）。但编辑应该在表单上水平居中。它如何实施？

更新：新增例如图形（请注意QLineEdits都在表格上水平居中）：

的错误结果：

Answer 1

我不知道这是否是你想要的，但它可能有所帮助：

def _init_ui(self): 
    mainLayout = QGridLayout() 
    mainLayout.setColumnStretch(0, 1) 
    mainLayout.setColumnStretch(3, 1) 

    edit1_label = QLabel("Edit1") 
    edit1 = QLineEdit() 

    mainLayout.addWidget(edit1_label, 1, 1) 
    mainLayout.addWidget(edit1, 1, 2) 

    edit2_label = QLabel("Edit2") 
    edit2 = QLineEdit() 

    mainLayout.addWidget(edit2_label, 2, 1) 
    mainLayout.addWidget(edit2, 2, 2) 

    edit3_label = QLabel("Edit3") 
    edit3 = QLineEdit() 

    mainLayout.addWidget(edit3_label, 3, 1) 
    mainLayout.addWidget(edit3, 3, 2) 

    mainLayout.setAlignment(Qt.AlignTop) 

    self.setLayout(mainLayout) 
    self.setAttribute(Qt.WA_StyledBackground)