我是 swift 和 firebase 的新手,我正在尝试用 firebase 数据填充我的 tabelview。当我运行该程序时,tableview 中没有显示任何内容。任何帮助将不胜感激。这就是我所做的,试图阅读文档,但没有帮助。
import UIKit
import Firebase
import FirebaseUI
class ChurchTableViewController: UITableViewController {
let firebase = Firebase(url:"https://.....com/")
var items = [NSDictionary]()
override func viewDidLoad() {
super.viewDidLoad()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
//self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func viewDidAppear(animated: Bool) {
//MARK: Load data from firebsr
firebase.observeEventType(.Value, withBlock: { snapshot in
print(snapshot.value)
}, withCancelBlock: { error in
print(error.description)
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return items.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
let dict = items[indexPath.row]
cell.textLabel?.text = dict["ChurchName"] as? String
return cell
}
最佳答案
您已经为您的 Firebase 数据库中的某些值发生变化时创建了观察者,但是在您的闭包中您需要添加新项目,当然还需要重新加载您的 UITableView
以同步您应用中的数据,请参阅以下代码以了解如何使用示例数据类型执行此操作的示例:
var items = [GroceryItem]()
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
firebase.observeEventType(.Value, withBlock: { snapshot in
var newItems = [GroceryItem]()
for item in snapshot.children {
let itemType = GroceryItem(snapshot: item as! FDataSnapshot)
newItems.append(itemType)
}
// update your item with the new ones retrieved
self.items = newItems
// reload the data
self.tableView.reloadData()
})
}
在下面的结构中,您可以看到如何根据 Firebase 返回的数据创建数据类型的示例
GroceryItem
struct GroceryItem {
let key: String!
let name: String!
let addedByUser: String!
let ref: Firebase?
var completed: Bool!
// Initialize from arbitrary data
init(name: String, addedByUser: String, completed: Bool, key: String = "") {
self.key = key
self.name = name
self.addedByUser = addedByUser
self.completed = completed
self.ref = nil
}
init(snapshot: FDataSnapshot) {
key = snapshot.key
name = snapshot.value["name"] as! String
addedByUser = snapshot.value["addedByUser"] as! String
completed = snapshot.value["completed"] as! Bool
ref = snapshot.ref
}
}
要更深入地了解如何使用 Firebase,您可以阅读这个非常好的教程:
希望对你有帮助
关于ios - swift 2 火力地堡 TableView ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36681968/