autolayout.py 文件源码

def __init__(self, view):
        assert(isinstance(view, ui.View))

        self._view = view
        self.add_subview(self._view)

        self._view_objc = ObjCInstance(self._view)
        self._objc = ObjCInstance(self)

        self._view_objc.setTranslatesAutoresizingMaskIntoConstraints_(False)
        self._objc.setTranslatesAutoresizingMaskIntoConstraints_(False)

        attributes = [LayoutAttribute.left, LayoutAttribute.right, LayoutAttribute.top, LayoutAttribute.bottom]
        for attribute in attributes:
            constraint = _LayoutConstraint.constraintWithItem_attribute_relatedBy_toItem_attribute_multiplier_constant_(
                self._view_objc, int(attribute), int(LayoutRelation.equal), self._objc, int(attribute), 1.0, 0
            )
            self._objc.addConstraint_(constraint)

        self._layout = None