Resize a UITextField while typing (by using Autolayout)

Question

I have a UITableViewCell which has two UITextFields (without borders). The following constraints are used to set up the horizontal layout.

@\"|-10-[leftTextFi

Answer 1

This is what works for me:

- (IBAction) textFieldDidChange: (UITextField*) textField
{
    [UIView animateWithDuration:0.1 animations:^{
        [textField invalidateIntrinsicContentSize];
    }];
}

What's interesting is that it seems as if it SHOULD work out of the box, given this text from the docs:

In addition, if a property of a view changes and that change affects the intrinsic content size, the view must call invalidateIntrinsicContentSize so that the layout system notices the change and can re-layout. In the implementation of your view class, you must ensure that if the value of any property upon which the intrinsic size depends changes, you invoke invalidateIntrinsicContentSize. For example, a text field calls invalidateIntrinsicContentSize if the string value changes.

My best guess is that the textfield only calls invalidateIntrinsicContentSize once editing has finished, not during.

Edit: A bunch of "This is not working for me". I think the confusion here is perhaps the triggering event that is tied to the textFieldDidChange: handler. The event needs to be UIControlEventEditingChanged. If you're using IB, double check that you're handling the right event.

The UITextField also cannot be constrained in size. You can lock it into position with constraints, but any width constraint, or set of left+right positioning constraints will prevent it from resizing to its intrinsic content size.