获得iPhone的相关信息

获取iphone的系统信息使用[UIDevice currentDevice],信息如下：

[[UIDevice currentDevice] systemName]：系统名称，如iPhone OS
[[UIDevice currentDevice] systemVersion]：系统版本，如4.2.1
[[UIDevice currentDevice] model]：The model of the device，如iPhone或者iPod touch
[[UIDevice currentDevice] uniqueIdentifier]：设备的惟一标识号，deviceID
[[UIDevice currentDevice] name]：设备的名称，如 张三的iPhone
[[UIDevice currentDevice] localizedModel]：The model of the device as a localized string，类似model

详见：http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html

但是以上的信息貌似无法得到设备的硬件信息，例如一个iphone3GS，系统升级到了iphone4。此时使用systemVersion得到的应该是4.x.x，那我们如何知道该设备为iphone3GS呢。网上流传一个方法，经测试应该是有用的。

自定义一个类：

#import <Foundation/Foundation.h>
@interface UIDeviceHardware : NSObject {   
}
- (NSString *) platform;
- (NSString *) platformString;
@end

#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 encoding:NSUTF8StringEncoding];
    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:@"iPod4,1"])      return @"iPod Touch 4G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"i386"] || [platform isEqualToString:@"x86_64"])         return @"iPhone Simulator";
    return platform;
}
@end

使用[[[UIDeviceHardware alloc] init] platform]应该就可以得到设备的硬件版本。