发出从 firebase 调用信息以设置按钮标题的问题
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【中文标题】发出从 firebase 调用信息以设置按钮标题的问题【英文标题】：issues calling information from firebase to set button titles 【发布时间】：2020-02-27 22:07:48 【问题描述】：我正在尝试从 firebase 检索一些信息，以便设置按钮的某些功能。我能够正确设置标题和背景颜色。但是，按钮操作是相同的。
在我看来，用户单击将信息保存到 Firebase 的按钮，然后按钮标题和背景会发生变化。当用户单击按钮时，启动的代码以 handleConfirm 开头。此代码运行完美，将所有数据保存到 firebase，等等。
@objc func handleConfirm()
let workUser = self.workerUser
let username = workUser?.name
let post = notification?.poster
let jobTitle = post?.category
let alert = UIAlertController(title: "Ready? ",message:" Are you ready to complete the job \(jobTitle!) for \(username!) ?", preferredStyle: UIAlertController.Style.alert)
let cancelButton = UIAlertAction(title: "Cancel", style: .default, handler: (_ action: UIAlertAction) -> Void in
print("you pressed Yes, please button")
)
let continueButton = UIAlertAction(title: "Get to Work!", style: .default, handler: (_ action: UIAlertAction) -> Void in
self.fetchJobProgress()
self.updateNSaveJobProgress()
let hud = JGProgressHUD(style: .dark)
hud.textLabel.text = "Confirming!"
hud.show(in: self.view)
hud.dismiss()
)
continueButton.setValue(GREEN_Theme, forKey: "titleTextColor")
cancelButton.setValue(UIColor.red, forKey: "titleTextColor")
alert.addAction(cancelButton)
alert.addAction(continueButton)
self.present(alert, animated: true, completion: nil)
func updateNSaveJobProgress()
let workUser = self.workerUser
let uid = Auth.auth().currentUser?.uid
let workerId = workUser?.uid
let address = workerUser?.address
let createDate = Int(NSDate().timeIntervalSince1970)
Database.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: (snapshot) in
guard let dictionary = snapshot.value as? [String : Any] else return
let user = User(dictionary: dictionary as [String : AnyObject])
workUser?.uid = snapshot.key
let docData: [String: Any] = ["workerId": uid!,
"creationDate": createDate,
"fromId" : workerId!,
"location": address,
"type": 2,
"checked": 0,]
self.postJobNotificationsIntoDatabseWithUID(uid: workerId!, values: docData as [String : AnyObject])
self.updateUserDataIntoDatabseWithUID(uid: uid!, values: docData as [String : AnyObject])
JOB_POST_REF.child(uid!).child("progress?").setValue(2)
, withCancel: (err) in
print("attempting to load information")
)
print("Finished saving user info")
self.dismiss(animated: true, completion:
print("Dismissal complete")
)
private func updateUserDataIntoDatabseWithUID(uid: String, values: [String: AnyObject])
let hud = JGProgressHUD(style: .dark)
hud.textLabel.text = "Saving"
hud.show(in: view)
let ref = Database.database().reference(fromURL: "https://oddjobs-b131f.firebaseio.com/")
let usersReference = ref.child("workInProgress").child(uid).childByAutoId()
usersReference.setValue(values, withCompletionBlock: (err, ref) in
if err != nil
print("error saving data into firebase")
return
hud.dismiss()
self.dismiss(animated: true, completion: nil)
)
private func postJobNotificationsIntoDatabseWithUID(uid: String, values: [String: AnyObject])
let ref = Database.database().reference(fromURL: "https://oddjobs-b131f.firebaseio.com/")
let usersReference = ref.child("notifications").child(uid).childByAutoId()
usersReference.setValue(values, withCompletionBlock: (err, ref) in
if err != nil
print("error saving data into firebase")
return
)
在此之后，我们要调用 fetchJobProgress()，如果用户按下按钮一次或两次，它会设置按钮的视图。注意，在
if type==userNotifications.NotificationType.inProgress.rawValue
如果我取消注释掉 isuserinteractionenabled = false，用户将无法与按钮交互。为什么？
func fetchJobProgress()
let workerId = workerUser?.uid
let uid = Auth.auth().currentUser?.uid
Database.database().reference().child("workInProgress").child(uid!).queryOrdered(byChild: "fromId").queryEqual(toValue: workerId).observeSingleEvent(of: .value, with: (snapshot) in
guard let dictionary = snapshot.value as? [String : Any] else return
for (_, valueDic) in dictionary
guard let dic = valueDic as? [String: Any] else
continue
guard let type = dic["type"] as? Int else
continue
if type == userNotifications.NotificationType.inProgress.rawValue
self.confirmButton.setTitle("In Progress...", for: .normal)
self.confirmButton.backgroundColor = UIColor.lightGray
//self.confirmButton.isUserInteractionEnabled = false
self.confirmButton.addTarget(self, action: #selector(self.handleComplete), for: .touchUpInside)
else if type == userNotifications.NotificationType.accepted.rawValue
self.confirmButton.backgroundColor = GREEN_Theme
self.confirmButton.addTarget(self, action: #selector(self.handleConfirm), for: .touchUpInside)
else if type == userNotifications.NotificationType.completed.rawValue
self.confirmButton.setTitle("Completed!", for: .normal)
self.confirmButton.backgroundColor = UIColor.lightGray
self.confirmButton.isUserInteractionEnabled = false
break
, withCancel: (err) in
print("attempting to load information")
)
现在，完美地设置了按钮颜色和标题。但是，按钮的操作仍然是 handleConfirm 而不是 handle Complete。
处理完整的样子
@objc func handleComplete()
let workUser = self.workerUser
let username = workUser?.name
let post = notification?.poster
let jobTitle = post?.category
let alert = UIAlertController(title: "Completed? ",message:" Did you complete the job \(jobTitle!) for \(username!) ?", preferredStyle: UIAlertController.Style.alert)
let cancelButton = UIAlertAction(title: "Not Yet!", style: .default, handler: (_ action: UIAlertAction) -> Void in
print("you pressed Yes, please button")
)
let continueButton = UIAlertAction(title: "Complete", style: .default, handler: (_ action: UIAlertAction) -> Void in
self.fetchJobProgress()
self.completeJobProgress()
let hud = JGProgressHUD(style: .dark)
hud.textLabel.text = "Confirming!"
hud.show(in: self.view)
hud.dismiss()
)
continueButton.setValue(GREEN_Theme, forKey: "titleTextColor")
cancelButton.setValue(UIColor.red, forKey: "titleTextColor")
alert.addAction(cancelButton)
alert.addAction(continueButton)
self.present(alert, animated: true, completion: nil)
func completeJobProgress()
let workUser = self.workerUser
let uid = Auth.auth().currentUser?.uid
let workerId = workUser?.uid
let address = workerUser?.address
let createDate = Int(NSDate().timeIntervalSince1970)
Database.database().reference().child("users").child(uid!).observeSingleEvent(of: .value, with: (snapshot) in
guard let dictionary = snapshot.value as? [String : Any] else return
let user = User(dictionary: dictionary as [String : AnyObject])
workUser?.uid = snapshot.key
let docData: [String: Any] = ["workerId": uid!,
"creationDate": createDate,
"fromId" : workerId!,
"location": address!,
"type": 3,
"checked": 0,]
self.setJobToCompletedInDatabase(uid: workerId!, values: docData as [String : AnyObject])
self.updateUserDataIntoDatabseWithUID(uid: uid!, values: docData as [String : AnyObject])
JOB_POST_REF.child(uid!).child("progress?").setValue(3)
, withCancel: (err) in
print("attempting to load information")
)
print("Finished saving user info")
self.dismiss(animated: true, completion:
print("Dismissal complete")
)
private func setJobToCompletedInDatabase(uid: String, values: [String: AnyObject])
let hud = JGProgressHUD(style: .dark)
hud.textLabel.text = "Saving"
hud.show(in: view)
let ref = Database.database().reference(fromURL: "https://oddjobs-b131f.firebaseio.com/")
let usersReference = ref.child("completedJob").child(uid).childByAutoId()
usersReference.setValue(values, withCompletionBlock: (err, ref) in
if err != nil
print("error saving data into firebase")
return
hud.dismiss()
self.dismiss(animated: true, completion: nil)
)
两者的代码非常相同，而不是一些小的更改，但它应该保存在 firebase 的两个不同的树中。
既然按钮颜色和标题的背景都被成功改变了，我不明白为什么按钮的动作没有？
如果这太令人困惑，我可以添加图片。
【问题讨论】：
【参考方案1】：您需要先删除该操作，然后再为按钮赋予新的操作：
关注代码：
self.confirmButton.removeTarget(nil, action: nil, for: .allEvents)
每当您设置新操作时添加此行。
更新方法：
func fetchJobProgress()
let workerId = workerUser?.uid
let uid = Auth.auth().currentUser?.uid
Database.database().reference().child("workInProgress").child(uid!).queryOrdered(byChild: "fromId").queryEqual(toValue: workerId).observeSingleEvent(of: .value, with: (snapshot) in
guard let dictionary = snapshot.value as? [String : Any] else return
for (_, valueDic) in dictionary
guard let dic = valueDic as? [String: Any] else
continue
guard let type = dic["type"] as? Int else
continue
if type == userNotifications.NotificationType.inProgress.rawValue
self.confirmButton.setTitle("Pending...", for: .normal)
self.confirmButton.backgroundColor = UIColor.lightGray
self.confirmButton.removeTarget(nil, action: nil, for: .allEvents)
self.confirmButton.addTarget(self, action: #selector(self.handleComplete), for: .touchUpInside)
// self.confirmButton.isUserInteractionEnabled = false
else if type == userNotifications.NotificationType.completed.rawValue
self.confirmButton.setTitle("completed", for: .normal)
self.confirmButton.setTitleColor(.black, for: [])
self.confirmButton.backgroundColor = .white
self.confirmButton.isUserInteractionEnabled = false
else
self.confirmButton.backgroundColor = GREEN_Theme
self.confirmButton.removeTarget(nil, action: nil, for: .allEvents)
self.confirmButton.addTarget(self, action: #selector(self.handleConfirm), for: .touchUpInside)
break
, withCancel: (err) in
print("attempting to load information")
)
【讨论】：
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