自动布局如何在具有3个相等宽度视图的视图中隐藏1个视图 [英] Auto layout how to hide 1 view in a view with 3 equal width views

问题描述

目前我在1个视图中有3个视图（固定在superview的前缘和后缘）。

3个观点目前看起来像这样：

如何通过自动布局实现此目的？或者我如何使用IBOutlets实现约束？

解决方案

Tj3n的答案有效，但它有一个缺点，你必须使用代码中的幻数，并在代码和IB中设置constrant属性。

恕我直言，一个更好的解决方案是设置IB中具有不同优先级的所有约束并激活/在代码中停用它们。试试这个：

1. 像以前一样设置前导/尾随约束。


2. 设置等宽所有三个视图的约束优先级高。


3. 为所有三个视图设置0宽度约束，优先级为 ，但在IB中将其停用。并将它们连接到代码中的 IBOutlet ，就像连接视图一样。


4. 激活任何0宽度约束以折叠您想要的视图，然后停用它们进行扩展。

请注意，只有1和2就位，可以实现等宽视图布局。使用3和4，您可以选择性地折叠/展开任何视图。

Currently I have 3 views inside 1 view (which is pinned to leading edge and trailing edge of superview).

The 3 views look like this currently:

However, in some cases, I wish to hide the indigo view, but still keep the last 2 the same widths like so:

How can I achieve this with autolayout? Or how can I achieve this using IBOutlets for constraints?

解决方案

Tj3n's answer works, but it has a drawback that you have to use magic numbers in your code and set constrant properties both in code and IB.

IMHO, a better solution would be setting up all the constrants in IB with different priorities and activating/deactivating them in code. Try this:

1. Set the leading/trailing constraints as you did before.
2. Set equal width constraints for all three views with priority high.
3. Set 0 width constraints for all three views with priority required, but leave them deactivated in IB. And connect them to IBOutlets in code just as connecting views.
4. Activate any of the 0 width constraints to collapse the view you want, and later deactivate them to expand.

Note that just with 1 and 2 in place, you can achieve the equal-width view layout. And with 3 and 4, you can collapse/expand any of the views selectively.

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