IOS判断版本

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- (void)viewDidLoad {
[super viewDidLoad];

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0) {
bannerView = [[ADBannerView alloc] init];
bannerView.delegate = self;
[self.view addSubview:bannerView];
}

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Class clazz = NSClassFromString(@"ADBannerView");
if (clazz) {
bannerView = [[ADBannerView alloc] init];
bannerView.delegate = self;
[self.view addSubview:bannerView];
}

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if (UIGraphicsBeginImageContextWithOptions != NULL) {
bannerView = [[ADBannerView alloc] init];
bannerView.delegate = self;
[self.view addSubview:bannerView];
}