我有一个操作表,并使用以下代码林向他们打开警报:
func showActionSheet(postId: String) {
let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
let action = UIAlertAction(title: NSLocalizedString("Beitrag melden", comment: ""), style: .default, handler: { _ in
self.alertBeitrageMelden(postId: postId)
})
actionSheet.addAction(action)
actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(actionSheet, animated: true, completion: nil)
}
我现在想将文本字段的输入存储在Firebase中的警报中:
func alertBeitrageMelden(postId: String){
// Create the action buttons for the alert.
let defaultAction = UIAlertAction(title: "Melden", style: .default) { (action) in
let ref = Database.database().reference().child("gemeldeteBeitraege").child(postId)
ref.setValue(["postId": postId, "reason": self.textFieldAlert])
}
let cancelAction = UIAlertAction(title: "Abbrechen", style: .cancel) { (action) in
// Respond to user selection of the action.
}
let alert = UIAlertController(title: "Beitrag melden", message: "Wieso möchtest du den Beitrag melden?", preferredStyle: .alert)
alert.addTextField { (textField) in
textField.placeholder = ""
if textField.text?.count ?? 0 > 0 {
self.textFieldAlert = textField.text!
}
}
alert.addAction(cancelAction)
alert.addAction(defaultAction)
self.present(alert, animated: true) {
}
}
我没有得到textField的任何数据。
在此先感谢您的帮助!
答案 0 :(得分:0)
您需要
if let te = alert.textFields?.first?.text , te.count > 0 {
let ref = Database.database().reference().child("gemeldeteBeitraege").child(postId)
ref.setValue(["postId": postId, "reason":te])
}
因为此self.textFieldAlert = textField.text!
将存储一个空的初始值,并移动此行
let alert = UIAlertController(title: "Beitrag melden", message: "Wieso möchtest du den Beitrag melden?", preferredStyle: .alert)
功能的顶部,因此您可以在警报操作中访问它
func alertBeitrageMelden(postId: String) {
let alert = UIAlertController(title: "Beitrag melden", message: "Wieso möchtest du den Beitrag melden?", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Melden", style: .default) { (action) in
if let te = alert.textFields?.first?.text , te.count > 0 {
let ref = Database.database().reference().child("gemeldeteBeitraege").child(postId)
ref.setValue(["postId": postId, "reason":te])
}
})
alert.addAction(UIAlertAction(title: "Abbrechen", style: .cancel) { (action) in
// Respond to user selection of the action.
})
alert.addTextField { (textField) in
textField.placeholder = ""
}
self.present(alert, animated: true)
}
您还可以通过保留对警报文本字段的引用来做到这一点
var alertTexf:UITextField!
func alertBeitrageMelden(postId: String){
let alert = UIAlertController(title: "Beitrag melden", message: "Wieso möchtest du den Beitrag melden?", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Melden", style: .default) { (action) in
if let te = self.alertTexf.text , te.count > 0 {
let ref = Database.database().reference().child("gemeldeteBeitraege").child(postId)
ref.setValue(["postId": postId, "reason":te])
}
})
alert.addAction(UIAlertAction(title: "Abbrechen", style: .cancel) { (action) in
// Respond to user selection of the action.
})
alert.addTextField { (textField) in
textField.placeholder = ""
self.alertTexf = textField
}
self.present(alert, animated: true)
}
答案 1 :(得分:0)
您可以使用textField
从alertController
获得alert.textFields?.first
。
示例:
func alertBeitrageMelden(postId: String){
// Create the action buttons for the alert.
let alert = UIAlertController(title: "Beitrag melden", message: "Wieso möchtest du den Beitrag melden?", preferredStyle: .alert)
alert.addTextField { (textField) in
textField.placeholder = ""
}
let defaultAction = UIAlertAction(title: "Melden", style: .default) { (action) in
if let textFieldAlert = alert.textFields?.first?.text, textFieldAlert.count > 0 {
let ref = Database.database().reference().child("gemeldeteBeitraege").child(postId)
ref.setValue(["postId": postId, "reason": textFieldAlert])
}
}
let cancelAction = UIAlertAction(title: "Abbrechen", style: .cancel) { (action) in
// Respond to user selection of the action.
}
alert.addAction(cancelAction)
alert.addAction(defaultAction)
self.present(alert, animated: true) {
}
}
答案 2 :(得分:0)
var event = new Date("01/02/1993");
var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
console.log(event.toLocaleString('en', options));
// expected output: "Saturday, January 2, 1993"
这是警报的配置处理程序,您可以在其中更改将添加的文本字段的属性。但是在这里设置一些文本变量没有任何意义,因为此时文本字段的alert.addTextField { textField in
}
为空。
您的目标应该是在需要时获取文本字段的text
,在这种情况下,应以text
的{{1}}
因此请在之前创建警报,然后声明警报的操作并添加文本字段
UIAlertAction
然后在默认操作中检查此文本字段的文本是否不为空,以及是否未将此文本保存到Firebase
handler