应用程序崩溃'无法实例化名为NSLayoutConstraint的类' [英] App crash with 'Could not instantiate class named NSLayoutConstraint'

问题描述

在.xib文件中，我如何保持iOS 6的Autolayout，但iOS版本低于6。

In a .xib file how do I keep the Autolayout on for iOS 6 but off for iOS below 6.

如果我将其关闭，我的.xib不会得到适当的布局。如果我在我的Iphone上以4.3崩溃的方式打开它。

If I turn it off my .xib doesn't get the proper layout . If I turn it on my Iphone with 4.3 crashes.

任何帮助都会感激不尽

谢谢

推荐答案

我不相信这是可能的，因为autolayout会更改应用程序的编译方式。我考虑解决这个问题的方法是：

I don't believe this is possible as autolayout changes how your application is compiled. The options I've considered for a workaround to this are:

• 检测显示器的高度并以编程方式更改某些元素（ick） ，但我只是做了一个简单的改动就完成了这个。）


• 检测显示器的高度并以编程方式加载适当的笔尖（缺点是保持两个笔尖）


• 忽略4显示并使用黑色边框提交（假设没人应该这样做）


• 尝试设计不会有额外空间的布局。（这总是可取的，但并不总是可行的.UIScrollViews / UITableViews绝对不错，但不是固定的全屏视图。）

• Detect the height of the display and programmatically change some of the elements (ick, but I've done this when it was just a simple change)
• Detect the height of the display and programmatically load the appropriate nib (the downside is maintaining two nibs)
• Ignore 4" displays and submit with black borders (let's assume no one should want this)
• Attempt to design layouts that won't suffer from having some additional space. (This is always desirable, but not always possible. UIScrollViews/UITableViews are definitely good with this, but not fixed full-screen views.)

我仍然在寻找更好的解决方案。

I am still looking for better solutions myself.

这是我用来确定4vs 3.5iphone的代码：

Here is the code I use to determine 4" vs 3.5" iphone:

if (screenBounds.size.height == 568) {
    // code for 4-inch screen
} else {
    // code for 3.5-inch screen
}

即使这似乎是hackish，但与Apple谈论此事。 ：|

Even this seems hackish, but talk to Apple about that. :|

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