#ifdef to check if device is iPhone 5

Question

I wrote: ``` #define IS_IPHONE_5 ([UIScreen mainScreen].bounds.size.height == 568.0) #ifdef IS_IPHONE_5 #define SCREEN_HEIGHT 568 #else #define SCREEN_HEIGHT 480 #endif ``` but it always return that device is iPhone 5... What am I doing wrong?

Accepted Answer

Your `IS_IPHONE_5` macro is just fine. You can do things like this:

```
if (IS_IPHONE_5) {
    // do something specific for iPhone 5
}
```

At compile time this code will be converted to:

```
if (([UIScreen mainScreen].bounds.size.height == 568.0)) {
}
```

The problem is your `SCREEN_HEIGHT` macros. The whole `#ifdef` block will be evaluated at compile time. Since you did define `IS_IPHONE_5`, the `SCREEN_HEIGHT` will always be set to 568.

You want a runtime determination of the screen height. You can get this from:

```
[UIScreen mainScreen].bounds.size.height
```

#ifdef to check if device is iPhone 5

Solution

Problem