Swift使用OC位移枚举

Swift使用OC的位移枚举的话可以像写数组一样
例如

typedef NS_OPTIONS(NSUInteger, QMUIViewBorderPosition) {
    QMUIViewBorderPositionNone      = 0,
    QMUIViewBorderPositionTop       = 1 << 0,
    QMUIViewBorderPositionLeft      = 1 << 1,
    QMUIViewBorderPositionBottom    = 1 << 2,
    QMUIViewBorderPositionRight     = 1 << 3
};

item.qmui_borderPosition = [.left, .top]