UITextField 'editing changed' event handling

[cquark]

Dear guys

What I'm trying to do:
1. check input text in a UITextField control.
2. if the input text is not in a correct form, correct it and reassign it to the UITextField.

The problem is:
when I assigned a new text into the UITextField in the 'editing changed' event handler, a new 'editing changed' event occurs and the event handler gets called infinite times.

My question is:
What is the proper way to achieve what I want?

Thanks in advance

[onlybasit]

Originally Posted by cquark

Dear guys

What I'm trying to do:
1. check input text in a UITextField control.
2. if the input text is not in a correct form, correct it and reassign it to the UITextField.

The problem is:
when I assigned a new text into the UITextField in the 'editing changed' event handler, a new 'editing changed' event occurs and the event handler gets called infinite times.

My question is:
What is the proper way to achieve what I want?

Thanks in advance

You might have solved the problem by now. But for future visitors you can accomplish this task by using the UITextFieldDelegate.

Use the delegate method

textField:shouldChangeCharactersInRange:replacementString:

to allow or disallow text changes.

For the above case we can do,

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

	NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];

	if( /* newString is not in correct form */ ) {
		NSString *fixedString = @"fixed string";
		textField.text = fixedString;
		return NO;
	}

	return YES;
}