Question

Is there a way to have a UIPickerView just have escalating numbers to infinity?
Haha. Just kidding, but seriously, I want just a bunch of numbers going up, but I don’t want to have to hard-code it all.

Thanks in advance!

Answer 1

I’m pretty sure this can be done with some cleverness (a custom integer class that supports arbitrarily large numbers, and periodically “rolling over” to a higher set of numbers once the user has scrolled through all NSIntegerMax rows (i.e. when the user scrolls to row NSIntegerMax you programmatically scroll them back to row 0 and display “row + NSIntegerMax” instead of just “row”). As they scroll through repeatedly you change it to “row + NSIntegerMax * 2”, etc.

Obviously you also have to handle them changing directions are some point.

But I suspect that’s what fancier than what you’re looking to do. In this case you just want to add these lines of code to your View Controller:

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return NSIntegerMax;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [NSString stringWithFormat:@"%d", row];
}

Then double click on the View nib file (the *.xib file) to open it in Interface Builder, and connect the “data source” outlet to the “File Owner” (the View Controller). That will get you as many integers as I could ever imagine someone scrolling to.