UIView缺少背景

我的应用程序的结构如下所示：

 - UIViewController2

           - Add UIView programmatically

UIViewController1包含UIViewController2，并且使用以下代码将一些UIView（从Xib载入）添加到UIViewController2：

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

//- set Frame before or after addSubView, there is no difference
CGRect frame = b.frame;
frame.origin.x = 0;
frame.origin.y = 0;
b.frame = frame;

原来的UIView看起来像这样：

添加到UIViewController后，它看起来像这样：

使用下面的代码，当我将UIView的宽度和高度分配为主视图的宽度和高度的一部分时，它看起来不错

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

    [self.view addSubview:b];
    CGRect frame = b.frame;
    frame.origin.x = 0;
    frame.origin.y = 0;

    //------- Assign the Width and Height Value
    //-------------------------------------------
    frame.size.width = CGRectGetWidth(self.view.bounds) / 3;
    frame.size.height = CGRectGetHeight(self.view.bounds) / 3;

    b.frame = frame;

看来要添加viewController直接作为子视图，而不是你应该添加view中viewController作为子视图。

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

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