Question

I’m trying to implement a program in Xcode that’s somewhat like a command line. I basically have a UITextView that can take multiple lines of text. Right now, I have a button that will make the necessary changes after the user is done entering commands, but I want to be able to have a method that gets called after the user hits the return key in the UITextView, so basically it makes changes after each command. Is it possible to do this?

Answer 1

If you set a delegate to the UITextView which implements

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

Then you can check if the last character is “\n”, and get the text entered since the last command by doing

NSArray* components = [textView.text componentsSeparatedByString:@"\n"];
if ([components count] > 0) {
    NSString* commandText = [components lastObject];
    // and optionally clear the text view and hide the keyboard...
    textView.text = @"";
    [textView resignFirstResponder];
}