Ios iPad应用程序modalpopup视图角颜色不正确。。。？

我正在开发iPad应用程序，有时我需要在IBAction上弹出视图。同样，我也正确地使用了下面的代码

SCSelection *vcSCSelection = [[SCSelection alloc]initWithNibName:@"SCSelection" bundle:Nil];
vcSCSelection.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:vcSCSelection animated:YES];

它工作正常，并显示了我的视图，该视图的大小为表单的。 我需要在此视图上应用一些背景自定义颜色，我在弹出视图的-（void）viewDidLoad方法中维护这些颜色，如下所示

self.view.backgroundColor = [UIColor colorWithRed:61/255.0 green:61/255.0 blue:61/255.0 alpha:1];

现在，我的问题是当弹出视图显示它被背景色覆盖时，除了下面的角。正如您可以发现的，有一些角落空间的颜色效果是不适用的。我只是用椭圆形突出它。

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我怎样才能克服这个问题。

我也遇到过类似的问题，下面是一篇关于我是如何做到这一点的评论。注意，此代码位于触发模态视图表示的视图控制器中

    // Login Table View Controller
    UITableViewController *loginPanel = (UITableViewController*)  [mainStoryboard instantiateViewControllerWithIdentifier: @"LoginTVC"];

    // Setup Login panel presentation style
    loginPanel.modalPresentationStyle               = UIModalPresentationFormSheet;

    // Present Login Panel (called before view's bounds modifications so that it instantiates
    [self presentViewController:loginPanel animated:YES completion:nil];

    // ============================================
    // Make form sheet's view slightly smaller or
    // equal to the login panel's view so that corners
    // don't have white color bleed.
    // ============================================

    // Set the bounds & clipping (very important) of the
    // superview (which would be the formsheet's view
    // when using UIModalPresentationFormSheet)
    loginPanel.view.superview.bounds                = CGRectMake(0, 0, 400, 380);
    loginPanel.view.superview.layer.cornerRadius    = 8.0f; 
    loginPanel.view.superview.clipsToBounds         = YES;

    // Set the bounds of the view being presented modally as UIModalPresentationFormSheet 
    loginPanel.view.bounds                          = CGRectMake(0, 0, 400, 380);