The SubView's background is lost

My application's structure is as follow:

- Page1: UIViewController:

            - UIView: contains Some UILabels, 1 UIButton

- Page2: UIViewController:

            - UIView: contains Some UILabels, 1 UIButton

The UIView I added programmatically in the UIViewController:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    SessionView* b = [[[NSBundle mainBundle] loadNibNamed:@"SessionView" owner:self options:nil] lastObject];
    CGRect frame = b.frame;

    b.frame = CGRectMake(0, 88, frame.size.width, frame.size.height);

    [self.view addSubview:b];
}

The weird thing is the UIView appears without its background color. And the button cannot be tapped.

I upload the source code here just in case you want to check.

I am working on iOS8, XCode6, iPad

Thanks a lot.

尝试这个 ：

  [mainview bringSubviewToFront:subview];

tick mark a subview clip...............

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