使用自动布局居中放置UIView只是不起作用 [英] Center a UIView with auto layout is just not working

问题描述

我有 UIImageView ，它的大小与屏幕尺寸相同(对于所有邻居，自动布局均为0).在其中，我还有另一个 UIImageView.，我希望它始终位于其父 imageview 的中心(因此位于屏幕的中心)，因此会根据屏幕尺寸更改其尺寸，并保持宽高比.

I have UIImageView which is in the screen size (auto layouts are 0 to all neighbours) . Inside it, i have another UIImageView. , i would like it to always be in the Center of its parent imageview(hence on the Center of the screen) , and so it will change its size in relation to screen size, and keep aspect ratio .

因此，在 storyboard (Xcode 6)内部，我试图控制从中心"视图拖动到其父视图，而不是添加纵横比约束，这比我看到的要大.其长宽比，并增加了约束条件.

So inside the storyboard(Xcode 6), i am trying to control drag from the Center view to its parent, than i add aspect ratio constrain ,than i see its aspect ratio,and that the constrain added.

现在运行此操作，将不更改图像大小，并且在所有屏幕上都保持相同大小.

Running this now, will NOT change image size and it stay in the same size for all screens.

以相同的方式，我想将其居中，因此我控制将其拖动到其超级视图，而不是选择 Center X 和 Center Y ，不用说不居中显示在任何屏幕尺寸上.

Than in the same way , i want to Center it , so i control drag to its superview , than chose Center X and Center Y , needless to say that its not centred to any screen size.

为什么要在中心放置视图如此困难?

Why is it has to be so hard to place a view in the Center ?

推荐答案

这非常容易.查看我的图片:

It's super easy. See my images:

然后您需要宽度/高度限制:

Then you need width/height-constraints:

您完成了！

要根据约束替换情节提要中的视图，只需选择视图本身并使用更新框架:

To replace your view in storyboard according to constraints, just select the view itself and use update frames:

如果您想要宽高比的宽度/高度，只需执行以下操作(乘数部分):

If you want aspect-ratio width/height, just do this (The multiplier part):

说明如何打开第一个窗口.然后只需按下复选框以添加约束:

Clarification of how to open the first window. Then just press the checkboxes to add the constraints:

这些容器中的中心"约束应与此窗口中添加的约束相同(按住CTRL键并拖动以打开超级视图以打开此约束):

These "center in container"-constraints should be the same as the added ones in this window (CTRL-drag to superview to open this):

要阐明要按下的按钮:

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