swift中闭包的使用(类似与block的做法)

cell.initBack { (cell) in

//具体的处理细节 

        }

cell中的回调属性声明

typealias buyBlockcallbackfunc = (_ cell:ABPurchaseCell)->Void


    var buyBlock: buyBlockcallbackfunc?;

    func initBack( mathFunction:@escaping (_ cell:ABPurchaseCell)->Void){ buyBlock = mathFunction } @IBAction func clickBtn(_ sender: Any) { if self.buyBlock != nil { self.buyBlock!(self); } }