xcode 图像视图的位置不明确
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Position is ambiguous for image view
提问by BJM
I'm just following the tutorial from Apple, and I get an error when I set the ratio 1:1 to the image view:
我只是在学习 Apple 的教程，当我将比例设置为 1:1 到图像视图时出现错误：
I think it's because the tutorial is for xCode 7, so how to fix it ?
我认为这是因为该教程适用于 xCode 7，那么如何修复它？
回答by Andrew Feng
From the snapshot you provided, you were not using Stack View, so you probably were following the older tutorial.
从您提供的快照来看，您没有使用Stack View，因此您可能正在学习较旧的教程。
I also had this problem when I was following apple's tutorial, and it turned out that I placed the image view out of my Stack View, which gives me the error you mentioned; and more importantly, when I tested the app and chose an image, the image was displayed at its original size.
我在学习苹果的教程时也遇到了这个问题，结果我把图像视图放在了我的Stack View 之外，这给了我你提到的错误；更重要的是，当我测试应用程序并选择图像时，图像以原始大小显示。
So the solution for me is simple: placing image view into the Stack View, as shown below:
所以我的解决方案很简单：将图像视图放入Stack View，如下所示：
回答by Peter
You need to set all the constraint for the ui elements. Aspect ratio isn't enough, you should set the x and y position too for that image. (e.g.: leading space to View and top space to Button)
您需要为 ui 元素设置所有约束。纵横比不够，您还应该为该图像设置 x 和 y 位置。（例如：前导空间到视图和顶部空间到按钮）
If you want to use auto layout, you should allways set all the constraints for all the elements.
如果要使用自动布局，则应始终为所有元素设置所有约束。
EDIT - for better understanding
编辑 - 为了更好地理解
Just setting the aspect ratio for a view isn't enough. You should give other position and size data too.
In this example, the Leading Space to: Superviewset the X coordinate. The Top Space to Top Layout Guideset the Y coordinate. After that we set aspect ratio, and width, or height data for the view. Like the image below.
仅设置视图的纵横比是不够的。您也应该提供其他位置和尺寸数据。在本例中，Leading Space to: Superview设置 X 坐标。该Top Space to Top Layout Guide组Y坐标。之后，我们为视图设置纵横比、宽度或高度数据。就像下图一样。
For better understanding I recommended you to check Stanford iOS developer lessons in iTunesU. Thats will help you understand auto layout.
为了更好地理解，我建议您查看 iTunesU 中的斯坦福 iOS 开发人员课程。这将帮助您了解自动布局。
