当从单元格中选择该用户时,我正在尝试使用我的 firebase 数据库中的用户名重命名“添加保镖”按钮
// Code for the contacts page where a user is selected from cell.
class ContactsTableViewController: UITableViewController {
var ref: DatabaseReference!,
posts = [eventsStruct]()
let cellId = "cellId"
var users = [CurrentUser]()
struct eventsStruct {
let email: String!
let username: String!
let phoneNumber: String!
}
override func viewDidLoad() {
super.viewDidLoad()
fetchUser()
}
func fetchUser() {
ref = Database.database().reference()
ref.child("Users").queryOrderedByKey().observe(.childAdded, with:{(snapshot) in
if let usersDictionary = snapshot.value as? [AnyHashable:String]
{
let email = usersDictionary["email"]
let username = usersDictionary["username"]
let phoneNumber = usersDictionary["phoneNumber"]
self.posts.insert(eventsStruct (email: email, username: username, phoneNumber: phoneNumber), at: 0)
DispatchQueue.main.async {
self.tableView.reloadData()
}
print(eventsStruct.init(email: email, username: username, phoneNumber: phoneNumber))
}
})
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
var homeViewController: HomeViewController?
//tap to dismiss contacts page
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
dismiss(animated: true) {
print("dismiss completed")
let user = self.posts[indexPath.row]
self.homeViewController?.addBodyguard.setTitle(user.email, for: .normal)
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
// let cell = UITableViewCell(style: .subtitle, reuseIdentifier: cellId)
let user = posts[indexPath.row]
cell.textLabel?.text = user.username
cell.detailTextLabel?.text = user.phoneNumber
return cell
}
@IBAction func cancelTapped(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
// the HOMEVIEWcontroller containing the button to be renamed
class HomeViewController: UIViewController, UISearchBarDelegate, CLLocationManagerDelegate, MKMapViewDelegate {
@IBOutlet weak var addBodyguard: UIButton!
@IBAction func Addguard(_ sender: Any) {
self.performSegue(withIdentifier: "contactsSegue", sender: nil)
}
}
最佳答案
与其在 ContactViewController
中设置 UIButtons 的标题,不如使用委托(delegate)将此事件传递给 HomeViewController
。
protocol ContactSelectionDelegate {
func contactSelected(email: String) -> Void
}
extension HomeViewController: ContactSelectionDelegate {
func contactSelected(email: String) -> Void {
self.addBodyguard.setTitle(email, for: .normal)
}
}
// In your HomeViewController
@IBAction func Addguard(_ sender: Any) {
self.performSegue(withIdentifier: "contactsSegue", sender: nil)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "contactsSegue")
{
let secondViewController = segue.destinationViewController as! ContactViewController
secondViewController.delegate = self
}
}
// In your ContactViewController
class ContactViewController {
....
weak var delegate: ContactSelectionDelegate?
...
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
dismiss(animated: true) {
print("dismiss completed")
let user = self.posts[indexPath.row]
self.delegate?.contactSelected(email: user.email)
}
}
}
关于swift - 如何使用来自 UIView 单元格的 firebase 用户名重命名不同 View Controller 中的按钮?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55440493/