如何加载多个故事板文件，这取决于IOS版本？ （5和6） [英] How to load multiple storyboard files depending on iOS version? (5 and 6)

问题描述

我有我试图做出的iOS 6和iOS 5兼容的标签栏控制器应用程序。
对于iOS 6，我使用自动布局。
但是，试图在iOS 5上运行的时候，我得到一个错误，由于它不承认NSLayoutConstraints。

I have a tab bar controller app that I am trying to make compatible for iOS 6 and iOS 5. For iOS 6, I use auto layout. But when trying to run on iOS 5, I get an error due to it not recognizing NSLayoutConstraints.

从我可以告诉，我需要使用无自动布局不同的故事板启用。我抄我的故事板到一个新的，但不知道如何设置这些故事情节在应用程序的委托来使用。

From what I can tell, I am required to use a different storyboard without auto layout enabled. I have copied my storyboard into a new one, but don't know how to set which storyboard to use in the app delegate.

请告诉我code做到这一点？

Whats the code to do this?

推荐答案

在您的应用程序委托，你应该找到code是这样的：

In your app delegate, you should find code like this:

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MyStoryboard" bundle:nil];
self.window.rootViewController = [storyboard instantiateInitialViewController];
[self.window makeKeyAndVisible];

这是您可以在其中添加一些code，你必须几个故事板取决于iOS版<版本中进行选择/ A>

This is where you can add some code to choose among the several storyboards that you have depending on the version of iOS:

UIStoryboard *storyboard;
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if (...) {
    storyboard = [UIStoryboard storyboardWithName:@"MyStoryboard-v5" bundle:nil];
} else {
    storyboard = [UIStoryboard storyboardWithName:@"MyStoryboard-v6" bundle:nil];
}
self.window.rootViewController = [storyboard instantiateInitialViewController];
[self.window makeKeyAndVisible];

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