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    <p>There are only 2 delegates for UIPickerView.</p> <ul> <li><a href="http://developer.apple.com/iPhone/library/documentation/UIKit/Reference/UIPickerViewDelegate_Protocol/Reference/UIPickerViewDelegate.html" rel="nofollow noreferrer">UIPickerViewDelegate</a></li> <li><a href="http://developer.apple.com/iphone/library/documentation/iPhone/Reference/UIPickerViewDataSource_Protocol/Reference/Reference.html" rel="nofollow noreferrer">UIPickerViewDataSource</a></li> </ul> <p>So, we can use only 7 methods to control UIPickerView by delegate.</p> <p><em>– pickerView:rowHeightForComponent:<br> – pickerView:widthForComponent:<br> – pickerView:titleForRow:forComponent:<br> – pickerView:viewForRow:forComponent:reusingView:<br> – pickerView:didSelectRow:inComponent:<br> – numberOfComponentsInPickerView:<br> – pickerView:numberOfRowsInComponent:</em></p> <p>that'all.</p> <p>In <a href="http://developer.apple.com/iPhone/library/documentation/UIKit/Reference/UITableViewDelegate_Protocol/Reference/Reference.html" rel="nofollow noreferrer">UITableViewDelegate case</a>, there are more methods for UITableView for managing selections. such as, <em>– tableView:willSelectRowAtIndexPath:<br> – tableView:didSelectRowAtIndexPath:<br> – tableView:willDeselectRowAtIndexPath:<br> – tableView:didDeselectRowAtIndexPath:</em> </p> <p>However...</p> <p>In UIPickerViewDelegate case, there is only 1 method for responding to row selection.</p> <p><em>– pickerView:didSelectRow:inComponent:</em> </p>
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