How to handle autoresizing on UIButton elements which has been created dynamically

Question

I create some buttons dynamically on my view and i decide their frames according to some of my JSON respone parameters. But i want to autoresize them when the device(dsimulator) rotates. I can easily do this on interface builder but can't do anything on dynamic ones. Can someone help? EDIT

Here is a snipped of my code

if (button.tag==1) {
    button.frame = CGRectMake(30.0f, yPosition, 200.0f, buttonHeight);
}
if (button.tag==2) {
    button.frame = CGRectMake(280.0f, yPosition, 200.0f, buttonHeight);
}
if (button.tag==3) {
    button.frame = CGRectMake(530.0f, yPosition, 200.0f, buttonHeight);
}

There is no problem when using Portraid mode but when it rotates to Landscape a big empty area stays on the right side of the screen. How can i fix this?(I mean, when i rotate, i want the buttons got to the center of the scren's width)

EDIT: I played with autoresizing on Size Inspector(Xcode 4.3) with my xib file and it works great, but whatever i did i couldn't resize the dynamically created buttons after rotation. I tried almost all of AutoresizingMask enums of UIView but nothing changes. Can someone please help

Answer 1

The attributes you've set up in your interface builder file are the UIViewAutoresizing attributes.

Take a look at this documentation from Apple on the UIView class (which your button is a subclass of); look for the UIViewAutoresizing attribute. That's the one you'll want.

Update: Here's a snippet of code for an MKMapView that uses this ability:

mainMapView = [[MKMapView alloc] initWithFrame:CGRectMake(20, 239, 280, 122)];
[mainMapView setAutoresizingMask:UIViewAutoresizingFlexibleTopMargin];

With UIViewAutoresizingFlexibleTopMargin, the map view moves down when the user answers the phone --- it fixes the map's position relative to the top of the screen.

Dig around in the documentation and you'll find the autoresizing mask that works best for your situation.

Answer 2

You can define by code what was the expected behavior when the device is rotated.

You can take a look at: http://developer.apple.com/library/ios/#documentation/uikit/reference/uiview_class/uiview/uiview.html

and

http://developer.apple.com/library/ios/#documentation/uikit/reference/uiview_class/uiview/uiview.html#//apple_ref/c/tdef/UIViewAutoresizing

You need to set the button behavior when you add it like:

[button setAutoresizingMask:UIViewAutoresizingFlexibleBottomMargin];