檢查目前裝置

擷取iphone的系統資訊使用[UIDevice currentDevice],資訊如下：

[[UIDevice currentDevice] systemName]：系統名稱，如iPhone OS

[[UIDevice currentDevice] systemVersion]：系統版本，如4.2.1

[[UIDevice currentDevice] model]：The model of the device，如iPhone或者iPod touch

[[UIDevice currentDevice] uniqueIdentifier]：裝置的惟一辨別号，deviceID

[[UIDevice currentDevice] name]：裝置的名稱，如 張三的iPhone

[[UIDevice currentDevice] localizedModel]：The model of the device as a localized string，類似model

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

但是以上的資訊貌似無法得到裝置的硬體資訊，例如一個iphone3GS，系統更新到了iphone4。此時使用systemVersion得到的應該是4.x.x，那我們如何知道該裝置為iphone3GS呢。網上流傳一個方法，經測試應該是有用的。

自定義一個類：

#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";