How could I use 3 PickerViews in the same View?

How could I use 3 Pi开发者_如何学PythonckerViews in the same View vertically? (I can't set height..) Because I try so many times,But it's still no work. THANKS...

I think you dont need three picker view in any case if you want to show three type items then you can use cthree components in single pickerview.use this datasource method - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView for doing this.