关于相机启动中提示

[MuRanJiangXia]

oc 中有这样处理
if (text)
_activityView.center = CGPointMake(centerPt.x - frame.size.width/2 - 24 , _labelReadying.center.y);
else
_activityView.center = CGPointMake(self.frame.size.width/2 , _labelReadying.center.y);

swift 上能加上么