设置label中的对齐方式
QLabel.setAlignment (self, Qt.Alignment)
下面查看Qt.Alignment：
Qt.AlignmentFlag
This enum type is used to describe alignment. It contains horizontal and vertical flags that can be combined to produce the required effect.
The TextElideMode enum can also be used in many situations to fine-tune the appearance of aligned text.
The horizontal flags are:
| Constant | Value | Description |
|---|---|---|
| Qt.AlignLeft | 0x0001 | Aligns with the left edge. |
| Qt.AlignRight | 0x0002 | Aligns with the right edge. |
| Qt.AlignHCenter | 0x0004 | Centers horizontally in the available space. |
| Qt.AlignJustify | 0x0008 | Justifies the text in the available space. |
The vertical flags are:
| Constant | Value | Description |
|---|---|---|
| Qt.AlignTop | 0x0020 | Aligns with the top. |
| Qt.AlignBottom | 0x0040 | Aligns with the bottom. |
| Qt.AlignVCenter | 0x0080 | Centers vertically in the available space. |
You can use only one of the horizontal flags at a time. There is one two-dimensional flag:
| Constant | Value | Description |
|---|---|---|
| Qt.AlignCenter | AlignVCenter | AlignHCenter | Centers in both dimensions. |
You can use at most one horizontal and one vertical flag at a time. Qt.AlignCenter counts as both horizontal and vertical.
Three enum values are useful in applications that can be run in right-to-left mode:
| Constant | Value | Description |
|---|---|---|
| Qt.AlignAbsolute | 0x0010 | If the widget's layout direction is Qt.RightToLeft (instead of Qt.LeftToRight, the default), Qt.AlignLeft refers to the right edge and Qt.AlignRight to the left edge. This is normally the desired behavior. If you want Qt.AlignLeft to always mean "left" and Qt.AlignRight to always mean "right", combine the flag with Qt.AlignAbsolute. |
| Qt.AlignLeading | AlignLeft | Synonym for Qt.AlignLeft. |
| Qt.AlignTrailing | AlignRight | Synonym for Qt.AlignRight. |
Masks:
| Constant | Value |
|---|---|
| Qt.AlignHorizontal_Mask | AlignLeft | AlignRight | AlignHCenter | AlignJustify | AlignAbsolute |
| Qt.AlignVertical_Mask | AlignTop | AlignBottom | AlignVCenter |
Conflicting combinations of flags have undefined meanings.
The Alignment type is a typedef for QFlags<AlignmentFlag>. It stores an OR combination of AlignmentFlag values.
简单示范：
self.label.setAlignment(Qt.AlignLeft)
