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我想检查我的UITextFields
的.text
状态。执行!= ""
上的功能并显示警报视图if == ""
。由于我有5个不同UITextFields
我想到了switch
声明。如何在Swift 3中使用UITextFields创建开关表达式
@IBAction func doneButton(_ sender: Any) {
let indexPath = IndexPath(row: 0, section: 0)
let cell = self.tableView.cellForRow(at: indexPath) as! SetupCell
var textFields: [UITextField] = []
textFields = [cell.nameTF,
cell.townTF,
cell.birthdayTF,
cell.genreTF,
cell.deejayTF]
for tf in textFields {
print("called") // is printed
if tf.text != "" {
print("not empty") // is printed
switch UITextField() {
case cell.nameTF:
saveCredential(ME, "name", cell.nameTF.text!)
case cell.birthdayTF:
saveCredential(ME, "birthday", cell.birthdayTF.text!)
case cell.townTF:
saveCredential(ME, "town", cell.townTF.text!)
case cell.deejayTF:
saveCredential(ME, "deejayName", cell.deejayTF.text!)
case cell.genreTF:
saveCredential(ME, "genre", cell.genreTF.text!)
default:
break
}
} else {
print("is empty") // printed
switch UITextField() {
case cell.nameTF:
presentAlertView(self, title: "Error", message: "Name missing")
case cell.birthdayTF:
presentAlertView(self, title: "Error", message: "Birthday missing")
case cell.townTF:
presentAlertView(self, title: "Error", message: "Town missing")
case cell.deejayTF:
presentAlertView(self, title: "Error", message: "Deejay name missing")
case cell.genreTF:
presentAlertView(self, title: "Error", message: "Genre missing")
default:
break
}
}
}
}
但是switch
语句中的代码没有执行。既不是空的情况下,也不是。我相信问题可能在switch UITextField()
,但我找不出解决方案。我错过了什么?非常感谢帮助。
PS。 saveCredential
以及presentAlertView
完全适用于应用程序的其他部分,所以这可能不是问题。但可以肯定的:
func presentAlertView(_ vc: UIViewController, title: String, message: String?) {
var alert = UIAlertController(title: title, message: nil, preferredStyle: UIAlertControllerStyle.alert)
if message != nil {
alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.alert)
}
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
vc.present(alert, animated: true, completion: nil)
}
谢谢你,做到了。将尽快接受 –
@DavidSeek欢迎队友:) –