#if 在 .h xcode 中确定设备类型
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#if to determine device type in .h xcode
提问by random
I am sure that this probably something extremely easy (or it can't be done), but I can't seem to find anything on it.
我确信这可能是一件非常简单的事情（或者它无法完成），但我似乎找不到任何关于它的东西。
In one of my classes .h file I need to determine if the app is running on an iPad or an iPhone. Then change the value of the #define accordingly.
在我的一个类 .h 文件中，我需要确定应用程序是在 iPad 还是 iPhone 上运行。然后相应地更改#define 的值。
Ideally I would this it would look something like this:
理想情况下，我希望它看起来像这样：
#if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone
#define deltaX 10.0
#define theda 15.0
#define threshHold 267.0
#endif
#if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad
#define deltaX 78.1
#define theda 67.2
#define threshHold 453.0
#endif
I am not sure what to use, any help would be very much appreciated.
我不确定要使用什么，任何帮助将不胜感激。
Thank you for your time!
感谢您的时间！
回答by bornbnid
A little late to the party, but figured I'd share what worked for me.
聚会有点晚了，但我想我会分享对我有用的东西。
A solution that has been working for me is to define IS_IPAD and IS_IPHONE somewhere like so
一个对我有用的解决方案是在这样的地方定义 IS_IPAD 和 IS_IPHONE
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
Then when needing the other defines based on ipad/iphone, do something like this
然后当需要基于 ipad/iphone 的其他定义时，做这样的事情
#define deltaX (IS_IPAD? 78: 10)
回答by joerick
Sadly, you can't do this, as in a universal app the same code runs on iPhone as on iPad, so this decision must be made at run-time, not compile-time.
遗憾的是，您不能这样做，因为在通用应用程序中，iPhone 和 iPad 上运行的代码相同，因此必须在运行时而非编译时做出此决定。
You should declare these variables in a header file, and then set them at run time depending on the value of UI_USER_INTERFACE_IDIOM().
您应该在头文件中声明这些变量，然后在运行时根据UI_USER_INTERFACE_IDIOM().
回答by Luke
You already have the code to determine the device, so that's fine.
您已经有了确定设备的代码，所以没问题。
I'd create your defines as follows:
我会按如下方式创建您的定义：
#define padDeltaX 10.0
#define phoneDeltaX 78.1
... etc
Then in your class file:
然后在你的类文件中：
if (if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
// do iPhone processing with the variables
}
else
{
// must be iPad
}
Alternatively:
或者：
float variableOne, variableTwo; // etc
if (if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
variableOne = phoneDeltaX;
variableTwo = phoneTheta; // etc
}
else
{
// must be iPad
variableOne = padDeltaX;
variableTwo = padTheta; // etc
}
// now do the shared processing with variableOne, variableTwo etc
Hope this helps!
希望这可以帮助！
