如何确定哪个文本字段处于活动状态

如何确定哪个文本字段处于活动状态

您可以

UITextField

在类中声明一个属性，然后在中为它分配当前文本字段

textFieldDidBeginEditing

。然后，您可以在需要时随时调用此文本字段。

class ViewController : UIViewController, UITextFieldDelegate {   var activeTextField = UITextField()   // Assign the newly active text field to your activeTextField variable   func textFieldDidBeginEditing(textField: UITextField) {        self.activeTextField = textField   }   // Call activeTextField whenever you need to   func anotherMethod() {       // self.activeTextField.text is an optional, we safely unwrap it here       if let activeTextFieldText = self.activeTextField.text {  print("Active text field's text: (activeTextFieldText)")  return;       }       print("Active text field is empty")   }}