在状态栏下没有导航栏的情况下扩展UIViewController的视图

问题描述

我的视图没有导航栏，但我想在状态栏下显示内容。我检查了顶部条形下的延伸边缘，在我的视图控制器中的不透明条形图下，我想在状态栏下显示的视图对顶部布局指南有0垂直间距约束，但是，这仍然是我得到的：

My view does not have a navigation bar, but I want to display content under status bar. I've checked extend edges under top bars, under opaque bars in my view controller, the view that I want to display under status bar has 0 vertical spacing constraint to top layout guide, but still, here is what I get:

状态栏有20px纯白色背景，我不想要。我希望我的视图在状态栏下重叠，就像下面的模型一样：

The status bar has 20px solid white background, which I don't want. I want my view to overlap under status bar, just like the mockup below:

如何做到这一点，没有有一个可见的导航栏（我还有它）因为我的视图保证在导航控制器中，但它永远不会显示，因为我有很多自定义设计的部分，包括顶部条形图）？

How can I do that, without having a visible navigation bar (I still have it as my view is guaranteed to be inside a navigation controller, but it's will never be visible as I have a lot of custom designed sections including top bars)?

推荐答案

经过数小时的调查几个小时后，我找到了答案：

After investigating tens of pages for hours, I've found an answer:

for (NSLayoutConstraint *constraint in self.view.constraints) {
    if((constraint.firstItem == self.topLayoutGuide && constraint.secondItem == self.view) ||
       (constraint.secondItem == self.topLayoutGuide && constraint.firstItem == self.view))         {
        constraint.constant = -20;
    }
}

对于任何想知道的人，我都没有使用特定的回答，但这个问题的衍生解决方案：。

For anyone wondering, I did not use a specific one answer, but a derived solution from this question: iOS7 - View under status bar - edgesForExtendedLayout not working.

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