先在interface builder上放上6個rectbutton，豎放，一排三個

　　然后我們下面來看代碼

　　.h文件代碼

　　1 //

　　2 // AutoSizeViewController.h

　　3 // AutoSize

　　4 //

　　5 // Created by Scott on 10-10-26.

　　6 // Copyright 2010 __MyCompanyName__. All rights reserved.

　　7 //

　　8

　　9 #import

　　10

　　11 @interface AutoSizeViewController : UIViewController {

　　12 UIButton *button1;

　　13 UIButton *button2;

　　14 UIButton *button3;

　　15 UIButton *button4;

　　16 UIButton *button5;

　　17 UIButton *button6;

　　18 }

　　19

　　20 @property (nonatomic,retain) IBOutlet UIButton *button1;

　　21 @property (nonatomic,retain) IBOutlet UIButton *button2;

　　22 @property (nonatomic,retain) IBOutlet UIButton *button3;

　　23 @property (nonatomic,retain) IBOutlet UIButton *button4;

　　24 @property (nonatomic,retain) IBOutlet UIButton *button5;

　　25 @property (nonatomic,retain) IBOutlet UIButton *button6;

　　26 @end

　　27

　　下面我們看.m的代碼

　　//

　　// AutoSizeViewController.m

　　// AutoSize

　　//

　　// Created by Scott on 10-10-26.

　　// Copyright 2010 __MyCompanyName__. All rights reserved.

　　//

　　#import "AutoSizeViewController.h"

　　@implementation AutoSizeViewController

　　@synthesize button1;

　　@synthesize button2;

　　@synthesize button3;

　　@synthesize button4;

　　@synthesize button5;

　　@synthesize button6;

　　/*

　　// The designated initializer. Override to perform setup that is required before the view is loaded.

　　- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

　　if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]))

　　{

　　// Custom initialization

　　}

　　return self;

　　}

　　*/

　　/*

　　// Implement loadView to create a view hierarchy programmatically, without using a nib.

　　- (void)loadView {

　　}

　　*/

　　/*

　　// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

　　- (void)viewDidLoad {

　　[super viewDidLoad];

　　}

　　*/

　　// Override to allow orientations other than the default portrait orientation.

　　- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

　　// Return YES for supported orientations

　　return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

　　}

　　- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration