iAds Pre-iOS 4.0

Question

如何允许没有或无法升级到iOS 4的iOS设备使用其中包含iAd的应用程序？截至目前，应用程序崩溃了。 iAd框架在xcode中列为optional。这是我的iAd代码：

    -(void)viewWillAppear:(BOOL)animated
    {
            [self addBanner];
}

- (void) addBanner {
    ADBannerView *adView = [[ADBannerView alloc] initWithFrame: CGRectMake(0, 0, 320, 50)];
    adView. requiredContentSizeIdentifiers = [NSSet setWithObjects: ADBannerContentSizeIdentifierPortrait, ADBannerContentSizeIdentifierLandscape, nil];
    adView.delegate = self; 
    [self.view addSubview: adView];
}

Answer 1

这已经得到了解答...... How to make iAds work on a 3.0 + iPhone-iPad app?