在运行时根据设备更改约束 [英] Change constraints based on device during run time

问题描述

我使用Storyboard设置我的约束。虽然一切都是完美的，我有一些意见，我想改变只有3.5设备上的约束。

I'm using Storyboard to set my constraints. While everything is perfect, I have a some views where I wish to change the constraints on only 3.5" devices.

这是可能吗？ p>

Is this possible? How can I do it?

推荐答案

您可以定义一个宏来确定屏幕大小，如下所示：

You can define a macro to determine the screen size, like the following:

#define isiPhone4 ([[UIScreen mainScreen] bounds].size.height == 480)?TRUE:FALSE

稍后在代码中你可以这样做：

Later in the code you can do something like this:

if (isiPhone4) {
    self.constraint.constant = NEW_VALUE;
}

要从代码访问storyboard约束，你应该为他们创建 IBOutlets （控制+像其他任何东西一样将它们拖到控制器中）。

To access storyboard constraints from code you should make IBOutlets for them (control+drag them into your controller like anything else).

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