如何让kGADAdSizeSmartBannerPortrait工作

我无法让kGADAdSizeSmartBannerPortrait工作.

预期:在iPhone 6 Plus上,横幅的宽度应为414点.在iPhone 6上,横幅的宽度应为375点.在其他iPhone和iPod上,这一点,横幅将是320点.

实际结果:我在所有设备上看到"320x50测试横幅".在宽屏设备上,320x50横幅在视图中居中.左侧和右侧的剩余空间呈灰色图案.

使用的实际代码:

GADBannerView* newbanner = [[GADBannerView alloc] initWithAdSize:kGADAdSizeSmartBannerPortrait];
NSLog(@"newbanner size: %@", NSStringFromCGSize(newbanner.frame.size));
newbanner.adUnitID = @"/6499/example/banner";
newbanner.rootViewController = self;
GADRequest *request = [GADRequest request];
request.testDevices = @[
                        @"somedeviceid1",
                        @"somedeviceid2",
                        ];
[newbanner loadRequest:request];
[self.view addSubview:newbanner];
newbanner.center = CGPointMake(self.view.frame.size.width * 0.5, self.view.frame.size.height * 0.5);

iPhone 6 Plus截图: