detecting iOS, iPhone, iPad and apple watch

// detecting iOS

NSString *version = [[UIDevice currentDevice] systemVersion];

NSLog(@"Version:%@",version);

//detecting iPhone

add these line to your .h file

#define IS_IPHONE_4 (fabs((double)[[UIScreen mainScreen]bounds].size.height - (double)480) < DBL_EPSILON)

#define IS_IPHONE_5 (fabs((double)[[UIScreen mainScreen]bounds].size.height - (double)568) < DBL_EPSILON)

#define IS_IPHONE_6 (fabs((double)[[UIScreen mainScreen]bounds].size.height - (double)667) < DBL_EPSILON)

#define IS_IPHONE_6_PLUS (fabs((double)[[UIScreen mainScreen]bounds].size.height - (double)736) < DBL_EPSILON)

and use it in your .m file

if (IS_IPHONE_4)

        NSLog(@"iPhone 4");

else if (IS_IPHONE_5)

        NSLog(@"iPhone 5");

//detecting iPad

if ([UIDevice currentDevice].userInterfaceIdiom != UIUserInterfaceIdiomPad)

{

        //code for iPad

}

//detecting apple watch

add these line to your .h file

#define IS_WATCH_42 (fabs((double)self.contentFrame.size.height - (double)174) < DBL_EPSILON)

#define IS_WATCH_38 (fabs((double)self.contentFrame.size.height - (double)151) < DBL_EPSILON)

and use it in your .m file

if (IS_WATCH_42)

        NSLog(@"apple watch 42mm");

    else if (IS_WATCH_38)

        NSLog(@"apple watch 38mm");