Data Source and Delegate Methods
Implement three key data source methods for your UIPickerView
to make it function properly at a minimum level. These methods are as follows:
numberOfComponentsInPickerView:—Return the number of columns, as an integer.
pickerView:numberOfRowsInComponent:—Return the maximum number of rows per wheel, as an integer. The number of rows does not need to be identical. You can have one wheel with many rows and another with very few.
pickerView:titleForRow:forComponent or pickerView:viewForRow:forComponent: reusingView: ...
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