本來這是QQ群里一個朋友的問題，網上查了一下，現在將方法大概整理一下，以便于需要的朋友使用。當然，使用
UIDevice類，也可以簡單的獲得到底當前平臺是iphone 還是itouch,但是你所獲得的信息也就僅限于此了，如果想獲得更多的
硬件平臺信息呢？使用sysctlbyname，即可。
獲取當前的平臺信息，需要查詢hw.machine 值，返回值為以下字符串：
iPhone1,1 (iphone一代)
iPhone1,2 (iphone 3G)
iPhone2,1 (iphone 3Gs)
iPhone3,1 (Iphone 4)
iPod1,1 (iPod Touch 1代)
iPod2,1 (iPod Touch 2代)
iPod3,1 (iPod Touch 3代)
i386 (模擬器)
使用方法：
UIDeviceHardware *h=[[UIDeviceHardware alloc] init];
[self setDeviceModel:[h platformString]];
[h release];
UIDeviceHardware.h 頭文件
//
// UIDeviceHardware.h
//
// Used to determine EXACT version of device software is running on.
#import <Foundation/Foundation.h>
@interface UIDeviceHardware : NSObject
- (NSString *) platform;
- (NSString *) platformString;
@end
UIDeviceHardware.m 實現文件
//
// UIDeviceHardware.m
//
// Used to determine EXACT version of device software is running on.
#import "UIDeviceHardware.h"
#include <sys/types.h>
#include <sys/sysctl.h>
@implementation UIDeviceHardware
- (NSString *) platform{
size_t size;
sysctlbyname("hw.machine", NULL, &size, NULL, 0);
char *machine = malloc(size);
sysctlbyname("hw.machine", machine, &size, NULL, 0);
NSString *platform = [NSString stringWithCString:machine];
free(machine);
return platform;
}
- (NSString *) platformString{
NSString *platform = [self platform];
if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 1G";
if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";
if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";
return platform;
}
@end