swift - 我正在尝试从 Magical Records 获取最新添加的数据

Question

我正在尝试从 Magical Records 获取最新添加的数据。我有一个名为 Weighttrack 的实体，它有两个属性 - 重量和日期，我想将最新添加的日期重量获取到我的标签，那么这怎么可能呢？

class WTStatusVC: UIViewController {
    var WeightArray = [WeightTracker]()
    var tsk: WeightTracker?
    @IBOutlet weak var currentWeightLbl: UILabel!
    @IBOutlet weak var previousWeightLbl: UILabel!

    override func viewWillAppear(_ animated: Bool) {
        super .viewWillAppear(animated)

        if let data = WeightTracker.mr_findAll(with: NSPredicate(format: "date == %@", "\(String(describing: tsk?.date))")) as? [WeightTracker] {

            WeightArray = data
            DispatchQueue.main.async {
               self.currentWeightLbl.text = self.tsk?.weight
            }
            print(data)
    }
}

Answer 1

你可以用过滤器来做到这一点

self.WeightArray = self.WeightArray.filter({ (item) -> Bool in
               return item.date == tsk?.date   
       })