IOS广告移动的类（封装好了，所有页面共用一个广告）

 //
 //  BannerViewController.h
 //

 #import <UIKit/UIKit.h>
 #import <iAd/iAd.h>
 #import <iAd/ADBannerView.h>

 #define kUp 1
 #define kDown (-1)
 #define bannerView_h 50
 #define kBannerFrameUnderNav CGRectMake(0, -50, 320, 50)
 #define kBannerFrameAboveTab CGRectMake(0, 367, 320, 50)

 @protocol ADDelegate
 @optional
 //在此方法中调整界面，当b为YES时，表示广告加载成功，调整界面，为NO时失败，界面调回原样
 - (void)ADIsComing:(BOOL)b;
 @end

 @interface BannerViewController : NSObject <ADBannerViewDelegate> {
     id <ADDelegate> delegate;
     NSInteger upOrDown;     //当广告出现时view向上还是向下滑动
     ADBannerView *view;
 }

 @property (nonatomic, assign) id<ADDelegate> delegate;
 @property (nonatomic, assign) NSInteger upOrDown;
 @property (nonatomic, assign) CGRect frame;
 @property (nonatomic, retain) ADBannerView *view;

 + (id) sharedBanner;
 + (void) releaseSharedBanner;
 - (id)initWithFrame:(CGRect)rect;
 - (BOOL) isBannerLoaded;

 @end

 //
 //  BannerViewController.m
 //
 //
 //  Created by   on 9/30/11.
 //  Copyright 2011 __MyCompanyName__. All rights reserved.
 //

 #import "BannerViewController.h"


 BOOL receiveAd = NO;
 BannerViewController *bannerViewController;

 @implementation BannerViewController
 @synthesize delegate;
 @synthesize upOrDown;
 @synthesize view;


 + (id) sharedBanner {
     if (bannerViewController == nil) {
         bannerViewController = [[[self class] alloc] initWithFrame:kBannerFrameUnderNav];
         bannerViewController.upOrDown = kUp;
     }
     return bannerViewController;
 }

 + (void) releaseSharedBanner {
     [bannerViewController release];
 }

 - (id)initWithFrame:(CGRect)rect {
     self = [super init];
     if (self != nil) {
         self.view = [[[ADBannerView alloc] initWithFrame:rect] autorelease];
         view.delegate = self;
     }
     return self;
 }

 - (void)setDelegate:(id <ADDelegate>)d {
     if (delegate == d) return;

     if (view.isBannerLoaded) {
         if (delegate != nil) {
             [delegate ADIsComing:NO];
         }
         [d ADIsComing:YES];
     }
     delegate = d;
 }

 - (CGRect)frame {
     return view.frame;
 }

 - (void)setFrame:(CGRect)r {
     view.frame = r;
 }

 - (BOOL) isBannerLoaded {
     return [(ADBannerView *)self.view isBannerLoaded];
 }

 #pragma mark - adbanner view delegage

 - (void)bannerViewDidLoadAd:(ADBannerView *)banner {
     if (receiveAd == NO) {
         receiveAd = YES;
         [delegate ADIsComing:YES];

         [UIView beginAnimations:nil context:nil];
         [UIView setAnimationDuration:0.3];
         banner.frame = CGRectOffset(banner.frame, 0, upOrDown * (banner.frame.size.height + 12));
         [UIView commitAnimations];
     }
 }

 - (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error {
     if (receiveAd == YES) {
         receiveAd = NO;
         [delegate ADIsComing:NO];

         [UIView beginAnimations:nil context:nil];
         [UIView setAnimationDuration:0.3];
         banner.frame = CGRectOffset(banner.frame, 0, -(upOrDown * (banner.frame.size.height + 12)));
         [UIView commitAnimations];
     }
 }

 - (void)bannerViewActionDidFinish:(ADBannerView *)banner {

 }

 - (BOOL)bannerViewActionShouldBegin:(ADBannerView *)banner willLeaveApplication:(BOOL)willLeave {
     return YES;
 }

 - (void)dealloc {
     self.view = nil;
     [super dealloc];
 }

 @end

使用方法：

1：在viewDidAppear:方法中添加以下代码，共享广告，设置委托为self

 - (void)viewDidAppear:(BOOL)animated
 {

 #ifdef CONTRACTIONM_FREE_2_0_
         BannerViewController *banner = [BannerViewController sharedBanner];
         self.bannerViewController = banner;
         banner.delegate = self;
         banner.upOrDown = kUp;
         [self.view addSubview:self.bannerViewController.view];
 #endif

     [super viewDidAppear:animated];
 }

2:在委托方法中根据b的值 ，调整界面

 #ifdef CONTRACTIONM_FREE_2_0_
 - (void)ADIsComing:(BOOL)b
 {
     if (b == YES) {
         if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
             self.settingsScrollView.frame = CGRectMake(0, 60, 320, 356);
             self.settingsScrollView.contentOffset = CGPointMake(0, 50);
             [self.settingsScrollView flashScrollIndicators];
             [self.settingsScrollView setContentOffset:CGPointMake(0, 0) animated:YES];
         }
     }
     else {
         self.settingsScrollView.frame = CGRectMake(0, 0, 320, 416);
     }
 }
 #endif

3：少了一步最最最重要的，我一直浪费了一天在这个上面，气死我啦，在页面跳转的时候把委托置为nil

 -(void)viewWillDisappear:(BOOL)animated
 {
     self.bannerViewController.delegate = nil;
     [super viewWillDisappear:animated];
 }