ios - 如何从UIPickerView获取选定的值

我知道通过UIDatePicker，您可以使用类似以下内容的东西：

NSDate *myDate = picker.date;

但是我在视图中使用的是UIPickerView。我如何才能类似地获得所选值？还是我必须设置didSelectRow类型的方法来做到这一点？

更新：此代码适用于具有1个组件的选择器：

NSInteger row;
NSString *weightSelected;

row = [repPicker selectedRowInComponent:0];
weightSelected = [pickerArray objectAtIndex:row];

我为带有2个组件的选择器厌倦了这段代码，但是它冻结了：

NSInteger row1, row2;
NSString *weightSelected1;
NSString *weightSelected2;

row1 = [repPicker selectedRowInComponent:0];
row2 = [repPicker selectedRowInComponent:1];
weightSelected1 = [pickerArray objectAtIndex:row1];
weightSelected2 = [pickerArray objectAtIndex:row2];
NSString *weightSelected = [NSString stringWithFormat:@"%@.%@", weightSelected1, weightSelected2];