How to detect iOS device model by macro

Steps 1]

Define macro's as follows in .pch file or create new header file (like in example Header.h )

#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)

#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)

#define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)

#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)

#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)

#define SCREEN_MAX_LENGTH (MAX(SCREEN_WIDTH, SCREEN_HEIGHT))

#define SCREEN_MIN_LENGTH (MIN(SCREEN_WIDTH, SCREEN_HEIGHT))

#define IS_IPHONE_4_OR_LESS (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)

#define IS_IPHONE_5 (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)

#define IS_IPHONE_6 (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)

#define IS_IPHONE_6P (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)

Steps 2] use following conditions (to check isRetina Supports or Not / is iPAD or iPhone / which iPhone device model used / Max Screen Length )

 if(IS_IPAD)

    {

        NSLog(@"IT'S IPAD");

    }

    if(IS_IPHONE)

    {

        NSLog(@"IT'S IPHONE");

    }

    

    //retina support

    if(IS_RETINA)

    {

        NSLog(@"RETINA SUPPORTED");

    }

    else

    {

        NSLog(@"RETINA NOT SUPPORTED");

    }

    

    

    

    

    if(IS_IPHONE_4_OR_LESS)

    {

        NSLog(@"IT'S  IPHONE_4_OR_LESS");

    }

    if(IS_IPHONE_5)

    {

        NSLog(@"IT'S IPHONE_5 or 5 IPHONE_5s ");

    }

    if(IS_IPHONE_6)

    {

        NSLog(@"IT'S IPHONE_6");

    }

    if(IS_IPHONE_6P)

    {

        NSLog(@"IT'S IPHONE_6Plus");

    }

    

    NSLog(@"================================================");

    NSLog(@"SCREEN_WIDTH: %.2f", SCREEN_WIDTH);

    NSLog(@"SCREEN_HEIGHT: %.2f", SCREEN_HEIGHT);

    NSLog(@"SCREEN_MAX_LENGTH: %.2f", SCREEN_MAX_LENGTH);

    NSLog(@"SCREEN_MIN_LENGTH: %.2f", SCREEN_MIN_LENGTH);