How to do an event when uitext field is being typed

Question

如何在UITextField中键入时执行操作？

Answer 1

First set your UITextField's delegate to your class.

If you want to call an event as soon as user types anything implement this method,

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
     NSLog(@"call your method");
    [self goMethodCall];
    return YES;
}

If you want somthing other than this, you have few more delegates.

There are few delegates that are invoked automatically...

– textFieldShouldBeginEditing:
– textFieldDidBeginEditing:
– textFieldShouldEndEditing:
– textFieldDidEndEditing:
– textField:shouldChangeCharactersInRange:replacementString:
– textFieldShouldClear:
– textFieldShouldReturn:

In any of the method call your action.

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Answer 2

There are several ways to be notified when the text of a text field has changed:

1. Implement the UITextField delegate method textField:shouldChangeCharactersInRange:replacementString:
2. Register for the UITextFieldTextDidChangeNotification notification.
3. Add an action/target for the UIControlEventEditingChanged control event on the text field.