我正在尝试将我的 Firestore 数据显示到我的 Tableview 中,但我似乎无法让它显示出来。
protocol DocumentSerializeable {
init?(dictionary:[String:Any])
}
struct Sourse {
var name: String
var content: String
var timeStamp: Date
var dictionary: [String: Any] {
return [
"name": name,
"content": content,
"timestamp": timeStamp
]
}
}
extension Sourse : DocumentSerializeable {
init?(dictionary: [String : Any]) {
guard let name = dictionary["name"] as? String,
let content = dictionary["content"] as? String,
let timeStamp = dictionary["timeStamp"] as? Date else {return nil}
self.init(name: name, content: content, timeStamp: timeStamp)
}
}
class SourseListTableViewController: UITableViewController {
var db: Firestore!
var sourseArray = [Sourse]()
private var document: [DocumentSnapshot] = []
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
//initalize Database
db = Firestore.firestore()
loadData()
}
起初我尝试了下面这段代码,没有错误,但没有加载到 tableview 中。
func loadData() {
db.collection("sourses").getDocuments() {
snapshot, error in
if let error = error {
print("\(error.localizedDescription)")
} else {
self.sourseArray = snapshot!.documents.flatMap({Sourse(dictionary: $0.data())})
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
经过一些研究(从 Firestore - Append to tableView when view is loaded 读取)我尝试了下面的代码,但我收到错误“无法将类型 '(name: String, content: String, timeStamp: Date?)' 的值转换为预期的参数类型'Sourse'"所以我尝试从所有代码中删除日期,但我仍然无法让它工作。
func loadData() {
db.collection("sourses").getDocuments() {
snapshot, error in
if let error = error {
print("\(error.localizedDescription)")
} else {
for document in snapshot!.documents {
let data = document.data()
let name = data["name"] as? String ?? ""
let content = data["content"] as? String ?? ""
let timeStamp = data["timeStamp"] as? Date
let newSourse = (name:name, content:content, timeStamp: timeStamp)
self.sourseArray.append(newSourse)
}
}
}
}
这是我的 numberOfRows/CellForRow 以确保它不是 tableview 本身。我还用 Storyboard仔细检查了“单元格标识符”。
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return sourseArray.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "SourseTableViewCell", for: indexPath)
let sourse = sourseArray[indexPath.row]
cell.textLabel?.text = "\(sourse.name)"
cell.detailTextLabel?.text = "\(sourse.content)"
return cell
}
最佳答案
您需要在解析您的快照
后重新加载您的tableView
。强制打开您的 Snapshot
也不是一个好主意:
.getDocuments { (snapshot, error) in
if let error = error {
print(error.localizedDescription)
} else {
if let snapshot = snapshot {
for document in snapshot.documents {
let data = document.data()
let name = data["name"] as? String ?? ""
let content = data["content"] as? String ?? ""
let timeStamp = data["timeStamp"] as? Date ?? Date()
let newSourse = Sourse(name:name, content:content, timeStamp: timeStamp)
self.sourseArray.append(newSourse)
}
self.tableView.reloadData()
}
}
关于ios - Firestore- 在 Tableview 中显示数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50192761/