start_charge.account end "account" ,Finish_charge.BranchFinish_charge_Branch
,case when start_charge.branch is null then finish_charge.branch else start_charge
为此,我从SCNNode创建了一个子类: static var tagCounter = 0 //to give every charge a uniqueselectedCharge: Charge?() self.chargeTag = Charge.tagCounter
Charge.charges.append我试图通