如何控制廣告橫幅在屏幕上的顯示位置？

Question

早上好，

我想設置一個廣告橫幅出現在屏幕上的頂部或底部某處，所以我一直在做的是這樣的;

if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) 
    { 

     bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait]; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     CGRect screenRect = [[UIScreen mainScreen] bounds]; 
     CGFloat screenWidth = screenRect.size.width; 
     CGFloat screenHeight = screenRect.size.height; 
     CGFloat screenXPos = (screenWidth /2); 
     CGFloat screenYPos = screenHeight - 150; 
     [bannerView_ setCenter:CGPointMake(screenXPos, screenYPos)]; 
     bannerView_.rootViewController = self; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     bannerView_.rootViewController = self; 
     [self.view addSubview:bannerView_]; 

    }else{ 

     bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait]; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     CGRect screenRect = [[UIScreen mainScreen] bounds]; 
     CGFloat screenWidth = screenRect.size.width; 
     CGFloat screenHeight = screenRect.size.height; 
     CGFloat screenXPos = (screenWidth /2); 
     CGFloat screenYPos = screenHeight -480; 
     [bannerView_ setCenter:CGPointMake(screenXPos, screenYPos)]; 
     bannerView_.rootViewController = self; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     bannerView_.rootViewController = self; 
     [self.view addSubview:bannerView_]; 

這是很凌亂，並沒有真正的工作我怎麼想，比如我想廣告橫幅出現大約150個像素頂掉任何設備（新iPad/iPhone等）

我會更好地在界面構建器中創建橫幅視圖嗎？但是，如果是這樣的話，我將如何實現上述代碼？

在此先感謝！

Answer 1

bannerView_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait]; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     bannerView.frame = CGRectMake(0, 0, 320,150); 
    [bannerView_ setCenter:CGPointMake(screenXPos, screenYPos)]; 
     bannerView_.rootViewController = self; 
     bannerView_.adUnitID = MY_BANNER_UNIT_ID; 
     bannerView_.rootViewController = self; 
     [self.view addSubview:bannerView_];