我有两个 TextField,我想检查它们是否为空。一个是通过键盘输入获取数据,另一个是从 PickerView 获取数据。
在将第二个 TextField 从键盘输入更改为 PickerView 输入之前,我使用了它:
func setupAddTargetIsNotEmptyTextFields() {
saveCupboardButton.isHidden = true //hidden okButton
saveViewButtonBorder.isHidden = true
addCupboardTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty),
for: .editingChanged)
addCupboardTypeTextField.addTarget(self, action: #selector(textFieldsIsNotEmpty),
for: .editingChanged)
}
@objc func textFieldsIsNotEmpty(sender: UITextField) {
sender.text = sender.text?.trimmingCharacters(in: .whitespaces)
guard
let name = addCupboardTextField.text, !name.isEmpty,
let type = addCupboardTypeTextField.text, !type.isEmpty
else
{
self.saveCupboardButton.isHidden = true
self.saveViewButtonBorder.isHidden = true
return
}
// enable okButton if all conditions are met
saveCupboardButton.isHidden = false
saveViewButtonBorder.isHidden = false
}
这很好用,但后来我添加了 PickerView:
func createPicker() {
// toolbar
let toolbar = UIToolbar()
toolbar.sizeToFit()
// doneButton
let done = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(donePressed))
toolbar.setItems([done], animated: false)
addCupboardTypeTextField.inputAccessoryView = toolbar
addCupboardTypeTextField.inputView = picker
}
@objc func donePressed() {
addCupboardTypeTextField.text = pick
self.view.endEditing(true)
}
因为我的原因,addTarget .editing changed
当 PickerView 设置数据时,它不会检查是否有任何更改。有没有办法解决这个问题?提前致谢