swift FireBase从数据库中观察/接收

Posted 2021-05-19

// Create array of data model
var dataArray = [Data]()

// Create retrieve data func
func retrieveData() {
    // Get reference to where data is stored
    let referenceDB = Database.database().reference().child("DataSetName")
        
    // Observe for changes
    referenceDB.observe(.childAdded) { (snapshot) in
        let snapshotValue = snapshot.value as! Dictionary<String,String>
            
        // Save snapshot values
        let text = snapshotValue["Body"]!
        let sender = snapshotValue["Sender"]!
            
        // Create data model and save snapshot values in
        let data = Data()
        data.body = text
        data.sender = sender
            
        // Append new data model in data model array
        self.dataArray.append(data)
            
        // IF TABLEVIEW: Reload tableView data to display changes
        self.tableView.reloadData()
    }
}

// Call retrieveMessages func in viewDidLoad
retrieveData()