how to shrink picker view in iphone?

Question

hello all, i have a very big problem...

i want to shrink picker view's height like it show only one row one column.and the height of the picker view must be equal to the height of row...

please post sample code also if you know how to do this. i m using interface builder to display picker view.

Answer 1

asked the same Question yesterday, unfortunately not possible.

http://stackoverflow.com/questions/901545/uipickerview-customisation

Answer 2

As far as I know, it will be messed up if you shrink it.

a) UITableView + UIPickerView
I recommend you use the "a row in UITableView + UIPickerView" to do this. You can use a row in tableView like the dropDownList in Windows, when you tap on this row will show the pickerView (hidden at first).

b) If you have a long lists of data in tableView and only one of the items needs to pick data, you should scroll the view using the following method (make sure to calculate the orginal position of pickerView as it will be moved up/down together):

-(void)setViewMove:(BOOL)moveUP offset:(CGFloat)offset
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    CGRect rect = self.view.frame;

    if(moveUP)
    {
        rect.origin.y-=offset;
        rect.size.height+=offset;
    }
    else    //move down
    {
        rect.origin.y+=offset;
        rect.size.height-=offset;
    }
    self.view.frame = rect;
    [UIView commitAnimations];
}

c) You can also add another view for the picker and go back to this view when you have selected something.

My conclusion is:
If you have only few lines in tableView, use a.
If you have lots of lines in tableView but only one of them needs picker, use b.
If you have lots of lines in tableView and lots of them need picker, use c.

Answer 3

Actually, you can slightly shrink the whole UIPickerView by applying an affine transform to an enclosing view. For example:

CGSize pickerSize = [pickerView sizeThatFits:CGSizeZero];

pickerTransformView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, pickerSize.width, pickerSize.height)];
pickerTransformView.transform = CGAffineTransformMakeScale(0.75f, 0.75f);

[pickerTransformView addSubview:pickerView];
[self.view addSubview:pickerTransformView];
[pickerTransformView release];

will scale a picker to 75% of its original size by placing it within a containing view and applying a scaling transform to that view. Applying a transform directly to the UIPickerView leads to undesirable drawing artifacts.

However, the kind of resizing you're looking for would be best served by creating a custom control.

Answer 4

yes, it is possible. Just put it inside a view and shrink the view. Easy as hell.

Answer 5

It is possible and easy!

Just open the nib file as plain text, then find the picker view and adjust the measures:

<object class="IBUIPickerView" id="783900772">
<reference key="NSNextResponder" ref="191373211"/>
<int key="NSvFlags">292</int>
<string key="NSFrame">{{85, 68}, {150, 116}}</string>

That's all!

Answer 6

Many apps use tiny horizontal pickers: http://images.macworld.com/images/reviews/graphics/143531-dr%5Fdof%5Foriginal.jpg