The overlay view displayed on the left (or leading) side of the text field.
- iOS 2.0+
- tvOS 9.0+
You can use the left overlay view to indicate the intended behavior of the text field. For example, you might display a magnifying glass in this location to indicate that the text field is a search field. The left overlay view flips automatically in a right-to-left user interface.
The left overlay view is placed in the rectangle returned by the
left method of the receiver. The image associated with this property should fit the given rectangle. If it does not fit, it is scaled to fit. If you specify a control for your view, the control tracks and sends actions as usual.