UIView缺少背景

Question

我的应用程序结构如下：

• UIViewController1

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UIViewController1包含UIViewController2，我添加了一些UIView，从Xib加载到UIViewController2，代码如下：

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;

最初的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，当我指定UIView的宽度和高度等于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;

Answer 1

您似乎直接将viewController添加为子视图，而应将view viewController添加为子视图。

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