Question

I have a MonoTouch 5 app I have written. I am using a custom table cell. On that cell is a UIStepper.

When I run this on the 5.0 similator or a 5.0 iPad or iPod Touch everything works fine.

I would like to target older devices as well, but am having one issue.

On the custom cell when I go to set the stepper.MinimumValue I am getting the following exception:

Objective-C exception thrown. Name: NSInvalidArgumentException Reason: -[UIStepper setMinimumValue:]: unrecognized selector sent to instance 0x426bee0

I have read things about the cell being garbage collected and such, but unless those are OS specific none of them make sense as being the problem.

Any suggestions?

Answer 1

The problem is that the UIStepper class doesn’t exist before iOS 5. It was added with iOS 5 and you can’t use that class if you’re targeting iOS 4. I’m not sure how you do it with MonoTouch, but you’ll have to provide your own implementation of a stepper to replace the system implementation on iOS 4 and branch the code accordingly.