Detect specific iPhone/iPod/iPad model

UIDevice+Model.h

typedef enum {
    kDeviceTypeUnknown = 0,
    kDeviceTypeSimulator,
    kDeviceTypeiPhone1G,
    kDeviceTypeiPhone3G,
    kDeviceTypeiPhone3GS,
    kDeviceTypeiPhone4,
    kDeviceTypeiPod1G,
    kDeviceTypeiPod2G,
    kDeviceTypeiPad
} DeviceType;

@interface UIDevice (Model)

@property(readonly) NSString *platformID;
@property(readonly) DeviceType deviceType;

@end

UIDevice+Model.m

#import "UIDevice+Model.h"
#import <sys/types.h>
#import <sys/sysctl.h>

#define BOX(x) [NSNumber numberWithInt:x]

@implementation UIDevice (Model)

- (NSString*) platformID
{
	size_t size;
	sysctlbyname("hw.machine", NULL, &size, NULL, 0);
	char *machine = malloc(size);
	sysctlbyname("hw.machine", machine, &size, NULL, 0);
	NSString *platform = [NSString stringWithUTF8String:machine];
	free(machine);
	return platform;
}

- (DeviceType) deviceType
{
    NSDictionary *tagMap = [NSDictionary dictionaryWithObjectsAndKeys:
        BOX(kDeviceTypeSimulator), @"i386",
        BOX(kDeviceTypeiPhone1G),  @"iPhone1,1",
        BOX(kDeviceTypeiPhone3G),  @"iPhone1,2",
        BOX(kDeviceTypeiPhone3GS), @"iPhone2,1",
        BOX(kDeviceTypeiPod1G),    @"iPod1,1",
        BOX(kDeviceTypeiPod2G),    @"iPod2,1",
        BOX(kDeviceTypeiPad),      @"iPad1,1",
        BOX(kDeviceTypeiPhone4),   @"iPhone3,1",
        nil];
    return [[tagMap objectForKey:self.platformID] intValue];
}

@end