uniqueIdentifier在ios7不支持后的替代方法

UIDevice的uniqueIdentifier方法在ios7就不支持了, 为了获得设备相关的唯一标识符, 
参考了这里：https://github.com/Itayber/UIDevice-uniqueID

但是改了部分代码（下面会贴上代码）. 另外，真机编译会出问题，解决记录如下：
1.  把我修改了的UIDevice-uniqueID.h/m(见下面代码)加到工程里.
2.  加IOKit.framework:
把IOKit.framework(在/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/System/Library/Frameworks/IOKit.framework) 拖到 编译选项-Build Phases-Link Binary With Libraries里.(注意到这个framework里没有头文件...)
3.  加IOKit的头文件:
    在工程目录下的源文件目录里新建IOKit文件夹,
把/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/Frameworks/IOKit.framework/Headers里的文件都拷贝到该目录里.
    同时添加好头文件搜索路径：
    在编译选项-Build Settings-Header Search Paths添加$SRCROOT,并且可递归遍历:recursive.
4. done.

注意：这个方法虽然算出了设备相关的唯一标识符，但其结果和原uniqueIdentifier函数结果是不一样的，且如果上appStore很有可能会被苹果审核为不通过.
--------------------------------------------贴代码:--------------------------------------------
UIDevice-uniqueID.h

/**
 *  @brief 计算设备相关唯一标识符.
 *  @note 来自https://github.com/Itayber/UIDevice-uniqueID,
 但是修改了部分算法.by xiaoU.
 **/


#import <UIKit/UIDevice.h>

@interface UIDevice (uniqueID)

- (NSString *) uniqueID;

- (NSString *) wifiMAC;
- (NSString *) bluetoothMAC;
- (NSString *) serialNumber;
- (NSString *) deviceIMEI;
- (NSString *)deviceECID;

@end

　UIDevice-uniqueID.m

#import "UIDevice-uniqueID.h"
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <arpa/inet.h>
#include <ifaddrs.h>
#import <mach/mach_port.h>
#import <CommonCrypto/CommonDigest.h>


#import <IOKit/IOKitLib.h> // add by U.


NSArray *getValue(NSString *iosearch);


// thanks Erica Sadun! 
// (spent time on this without realizing you had already wrote what I was looking for!)
NSArray *getValue(NSString *iosearch)
{
    mach_port_t          masterPort;
    CFTypeID             propID = (CFTypeID) NULL;
    unsigned int         bufSize;
    
    kern_return_t kr = IOMasterPort(MACH_PORT_NULL, &masterPort);
    if (kr != noErr) return nil;
    
    io_registry_entry_t entry = IORegistryGetRootEntry(masterPort);
    if (entry == MACH_PORT_NULL) return nil;
    
    CFTypeRef prop = IORegistryEntrySearchCFProperty(entry, kIODeviceTreePlane, (CFStringRef) iosearch, nil, kIORegistryIterateRecursively);
    if (!prop) return nil;
    
	propID = CFGetTypeID(prop);
    if (!(propID == CFDataGetTypeID())) 
	{
		mach_port_deallocate(mach_task_self(), masterPort);
		return nil;
	}
    
    CFDataRef propData = (CFDataRef) prop;
    if (!propData) return nil;
    
    bufSize = CFDataGetLength(propData);
    if (!bufSize) return nil;
    
    NSString *p1 = [[[NSString alloc] initWithBytes:CFDataGetBytePtr(propData) length:bufSize encoding:1] autorelease];
    mach_port_deallocate(mach_task_self(), masterPort);
    return [p1 componentsSeparatedByString:@""];
}


@implementation UIDevice (uniqueID)


// UDID = SHA1(SerialNumber + IMEI + WiFiAddress + BluetoothAddress) 
// http://iphonedevwiki.net/index.php/Lockdownd
 /** add by U: 这网址里说了, iphone4之后，公示应该是：SHA1(SerialNumber + ECID + WiFiAddress + BluetoothAddress). 
  而实际真机测试发现- deviceIMEI函数获取不到IMEI.
  所以修改了这函数. */
- (NSString *) uniqueID
{

    // Returns a random hash if run in the simulator
#if TARGET_IPHONE_SIMULATOR

    return [[[[[NSProcessInfo processInfo] globallyUniqueString] stringByReplacingOccurrencesOfString:@"-" withString:@""] substringToIndex:40] lowercaseString];
    
#endif
    
    NSString *concat = [NSString stringWithFormat:@"%@%@%@%@",
                                                    [self serialNumber],
                                                    [self deviceECID],//[self deviceIMEI],
                                                    [self wifiMAC],
                                                    [self bluetoothMAC]];
    
    
    const char *cconcat = [concat UTF8String];
    
    unsigned char result[20];
    CC_SHA1(cconcat,strlen(cconcat),result);
    
    NSMutableString *hash = [NSMutableString string];
    int i;
    for (i=0; i < 20; i++)
    {
        [hash appendFormat:@"%02x",result[i]];
    }
    
    return [hash lowercaseString];
}


- (NSString *) wifiMAC
{
    struct ifaddrs *interfaces;
    const struct ifaddrs *tmpaddr;
    
    if (getifaddrs(&interfaces)==0)
    {
        tmpaddr = interfaces;
        
        while (tmpaddr != NULL)
        {
            if (strcmp(tmpaddr->ifa_name,"en0")==0)
            {
                struct sockaddr_dl *dl_addr = ((struct sockaddr_dl *)tmpaddr->ifa_addr);
                uint8_t *base = (uint8_t *)&dl_addr->sdl_data[dl_addr->sdl_nlen];
                
                NSMutableString *s = [NSMutableString string];

                int i;

                for (i=0; i < dl_addr->sdl_alen; i++)
                {
                    [s appendFormat:(i!=0)?@":%02x":@"%02x",base[i]];
                }
                
                return s;
            }
            
            tmpaddr = tmpaddr->ifa_next;
        }
        
        freeifaddrs(interfaces);
    }
    return @"00:00:00:00:00:00";

}


// I hope someone will find a better way to do this
- (NSString *) bluetoothMAC
{
    mach_port_t port;
    
    IOMasterPort(MACH_PORT_NULL,&port);
    
    CFMutableDictionaryRef bt_dict = IOServiceNameMatching("bluetooth");
    mach_port_t btservice = IOServiceGetMatchingService(port, bt_dict);
    
    CFDataRef bt_data = (CFDataRef)IORegistryEntrySearchCFProperty(btservice,"IODevicTree",(CFStringRef)@"local-mac-address", kCFAllocatorDefault, 1);
    
    NSString *string = [((NSData *)bt_data) description];
    
    string = [string stringByReplacingOccurrencesOfString:@"<" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@">" withString:@""];
    string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];
    
    
    NSMutableString *btAddr = [NSMutableString string];
    
    int x=0;
    while (x<12)
    {
        x++;
        [btAddr appendFormat:((x!=12&&x%2==0)?@"%C:":@"%C"),[string characterAtIndex:(x-1)]];
    }
    
    return btAddr;
}

- (NSString *) serialNumber
{
    return [getValue(@"serial-number") objectAtIndex:0];
}

- (NSString *) deviceIMEI
{
    return [getValue(@"device-imei") objectAtIndex:0];
}


/// add by U:
//
- (NSString *)deviceECID
{
    NSString * res = nil;
    if (CFMutableDictionaryRef dict = IOServiceMatching("IOPlatformExpertDevice")) {
        if (io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, dict)) {
            if (CFTypeRef ecid = IORegistryEntrySearchCFProperty(service, kIODeviceTreePlane, CFSTR("unique-chip-id"), kCFAllocatorDefault, kIORegistryIterateRecursively)) {
                NSData *data((NSData *) ecid);
                size_t length([data length]);
                uint8_t bytes[length];
                [data getBytes:bytes];
                char string[length * 2 + 1];
                for (size_t i(0); i != length; ++i)
                    sprintf(string + i * 2, "%.2X", bytes[length - i - 1]);
                printf("%s", string);
                res = [[[NSString alloc] initWithCString:string encoding:NSASCIIStringEncoding] autorelease];
                CFRelease(ecid);
            }
            IOObjectRelease(service);
        }
    }
    return res;
}

@end