Question

我想从autoID节点中获取值。下面是我的结构：

"workout"
  "exercise"
    "Bench Press"
      "(AutoIDNode)"
        "reps: 10"
        "set: 1"
        "weight: 60"

如何获取“ reps”，“ set”和“ weight”的值。

这是我的快速代码：

refSets.child("workout").child("exercise").child("Bench Press").observe(DataEventType.value, with: {(snapshot) in
        if snapshot.childrenCount > 0 {
            self.setsData.removeAll()

            for sets in snapshot.children {
                let snap = sets as! DataSnapshot
                let key = snap.key
                let value = snap.value
                print(key)
                print(value!)
            }     
        }
    })

我知道我缺少.child（“ Bench Press”）之后的autoID节点的.child（）路径。如何访问此节点？

预先感谢

Answer 1

您可以尝试

refSets.child("workout").child("exercise").child("Bench Press").observeSingleEvent(of: .value, with: {(snapshot) in

    if let res = snapshot.value as? [String:[String:Int]] {

        for item in Array(res.values) {

            print(item["reps"])
        }

    }

})

Answer 2

那怎么办？

refSets
  .child("workout")
  .child("exercise")
  .child("Bench Press").observe(.value, with: {(snapshot) in
    guard let values = snapshot.value as [String: Any] else {
      return
    }

    for (key, value) in values {
      guard let objDict = value as? [String: Any], 
        let reps = objDict["reps"] as? Double /*not sure maybe Int*/,
        let set = objDict["set"] as? Double,
        let weight = objDict["weight"] as? Double else {
        continue 
      }
      let bp = BenchPress(reps: reps, set: set, weight: weight)

    }
  })

struct BenchPress {

  private let reps: Double
  private let set: Double
  private let weight: Double

  init(reps: Double, set: Double, weight: Double) {

    self.reps = reps
    self.set = set
    self.weight = weight
  }
}

从autoID节点中检索值

2 个答案: