The index number of the cancel button.
- iOS 2.0–8.3Deprecated
Button indices start at
0. The default value of this property is normally
-1, which indicates that no cancel button has been set. However, a cancel button may be created and set automatically by the
init(title: method. If you use that method to create a cancel button, you should not change the value of this property.
When presenting an action sheet on an iPad, there are times when you should not include a cancel button. For more information on when you should include a cancel button, see the class overview or iOS Human Interface Guidelines.