如何从重置视图框架prevent自动版式？ [英] How to prevent AutoLayout from resetting view frames?

问题描述

我有一个自动版式视图，并与不同的屏幕尺寸很好地工作。还有的屏幕上四处移动根据用户行为的一个元素，但。每当我导航到不同的屏幕，然后回到这个观点，这个元素被复位到原来的位置。

I have a view with AutoLayout and it works nicely with different screen sizes. There's one element on the screen though that moves around depending on user actions. Whenever I navigate down to a different screen then back to this view, this element gets reset to its original position.

我明白为什么会这样，但我怎么能prevent呢？我也希望它后第一时间被设置正确，但最初没有。

I understand why this happens but how can I prevent it? I do want it to be setup correctly initially but not after the first time.

推荐答案

如果您正在使用自动布局，你不应该使用SETFRAME /因为的setBounds如您所见自动布局忽略它们并重写他们何时更新。

If you're using Autolayout you should never use setFrame/setBounds because as you've seen Autolayout ignores them and rewrites them when it updates.

的解决方案是改变的约束。约束有一个叫做常量参数这是您可以在创建后对约束更改的唯一的事情。您还可以添加/当你需要移动NSViews删除多余的约束。

The solution is to change the constraints. A constraint has a parameter called constant which is the only thing you can change on a constraint after it has been created. You can also add/remove extra constraints when you need to move NSViews around.

有来自WWDC 2012的影片，有如何使用自动版式移动的观点一个很好的例子。

There is a video from WWDC 2012 that had a very good example of how to move views with AutoLayout.

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