快速檢查，看看firebase的值是真是假

你好，我從firebase檢索一些信息，我正在尋找的數據是三個孩子深，幷包含一個布爾值。當我打印的值能夠得到結果，但我無法看到結果是真是假。快速檢查，看看firebase的值是真是假

func userInfo() { 

    let dbRef = FIRDatabase.database().reference() 
    let stRef = FIRStorage.storage().reference() 

    dbRef.child("users/\(userBiD!)").observeEventType(.Value, withBlock: { snapshot in 

     let name = snapshot.value!["firstname"] as! String 
     let profileImage = snapshot.value!["profilePic"] as! String 
     let receivePostRequest = snapshot.value?["receivePostRequest"] 

     self.nameLabel.text = name 
     self.dbUserProfilePic(self.profilePhotoImageView, imageLink: profileImage) 

     let receivePost = snapshot.childSnapshotForPath("receivePostRequest") 

     let tags = receivePost.childSnapshotForPath("tags") 

     for child in tags.children { 

      /* 
      ... 
      tags{ 
       tag1 = true 
       tag2 = false 

      } 
      //I need to print all keys that have a true value 

      */ 

     } 

    }) 

}

火力JSON

來源

2016-06-20 pprevalon

'tags.children'的結構是什麼？ – Alexander

@AMomchilov請看看編輯我添加了確切的JSON。我通常會在鍵值爲true的情況下進行查詢，但是因爲關閉firebase中的im不允許我進行查詢。 – pprevalon

由於，根據Firebase Docs， .children是。。。

該快照中子節點的快照的迭代器。您可以使用本地for..in語法。

。。。那麼您必須使用.value來訪問他們的數據並使用.key來訪問他們的密鑰。

因此，你可以做這樣的事情。

func userInfo() { 

    let dbRef = FIRDatabase.database().reference() 
    let stRef = FIRStorage.storage().reference() 

    dbRef.child("users/\(userBiD!)").observeEventType(.Value, withBlock: { snapshot in 

     let name = snapshot.value!["firstname"] as! String 
     let profileImage = snapshot.value!["profilePic"] as! String 
     let receivePostRequest = snapshot.value?["receivePostRequest"] 

     self.nameLabel.text = name 
     self.dbUserProfilePic(self.profilePhotoImageView, imageLink: profileImage) 

     let receivePost = snapshot.childSnapshotForPath("receivePostRequest") 

     let tags = receivePost.childSnapshotForPath("tags") 

     for child in tags.children { 
      // NEW 
      if child.value == true { 
       print(child.key) 
      } 
      // NEW 
     } 

    }) 

}

或者，如果您想要將所有真值保存在數組中。

func userInfo() { 

    let dbRef = FIRDatabase.database().reference() 
    let stRef = FIRStorage.storage().reference() 

    dbRef.child("users/\(userBiD!)").observeEventType(.Value, withBlock: { snapshot in 

     let name = snapshot.value!["firstname"] as! String 
     let profileImage = snapshot.value!["profilePic"] as! String 
     let receivePostRequest = snapshot.value?["receivePostRequest"] 

     self.nameLabel.text = name 
     self.dbUserProfilePic(self.profilePhotoImageView, imageLink: profileImage) 

     let receivePost = snapshot.childSnapshotForPath("receivePostRequest") 

     let tags = receivePost.childSnapshotForPath("tags") 

     for child in tags.children { 
      // NEW 
      var trueValues: [Bool] = [] 

      if child.value == true { 
       trueValues.append(child.key) 
      } 
      // NEW 
     } 

    }) 

}

來源

2017-01-14 16:40:16 skunkmb

快速檢查，看看firebase的值是真是假

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