刚刚发现,UIDevice uniqueIdentifier属性在iOS 5中已弃用,在iOS 7及以上版本中不可用。似乎没有可供选择的方法或属性。

我们现有的许多应用程序都紧密依赖于这个属性来唯一地识别特定的设备。今后我们该如何处理这个问题?

2011-2012年的文件建议:

特殊注意事项 不要使用uniqueIdentifier属性。创建特定的唯一标识符 你可以调用CFUUIDCreate函数来创建一个UUID,然后写入 使用NSUserDefaults类将它转换到默认数据库。

但是,如果用户卸载和重新安装应用程序,这个值就不一样了。


当前回答

下面的代码有助于获得UDID:

        udid = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
        NSLog(@"UDID : %@", udid);

其他回答

使用上面提到的SSKeychain和代码。下面是复制/粘贴(添加SSKeychain模块)的代码:

+(NSString *) getUUID {

//Use the bundle name as the App identifier. No need to get the localized version.

NSString *Appname = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];    

//Check if we have UUID already

NSString *retrieveuuid = [SSKeychain passwordForService:Appname account:@"user"];

if (retrieveuuid == NULL)
{

    //Create new key for this app/device

    CFUUIDRef newUniqueId = CFUUIDCreate(kCFAllocatorDefault);

    retrieveuuid = (__bridge_transfer NSString*)CFUUIDCreateString(kCFAllocatorDefault, newUniqueId);

    CFRelease(newUniqueId);

    //Save key to Keychain
    [SSKeychain setPassword:retrieveuuid forService:Appname account:@"user"];
}

return retrieveuuid;

}

对于Swift 3.0,请使用以下代码。

let deviceIdentifier: String = (UIDevice.current.identifierForVendor?.uuidString)!
NSLog("output is : %@", deviceIdentifier)

给你一个小技巧:

/**
 @method uniqueDeviceIdentifier
 @abstract A unique device identifier is a hash value composed from various hardware identifiers such
 as the device’s serial number. It is guaranteed to be unique for every device but cannot 
 be tied to a user account. [UIDevice Class Reference]
 @return An 1-way hashed identifier unique to this device.
 */
+ (NSString *)uniqueDeviceIdentifier {      
    NSString *systemId = nil;
    // We collect it as long as it is available along with a randomly generated ID.
    // This way, when this becomes unavailable we can map existing users so the
    // new vs returning counts do not break.
    if (([[[UIDevice currentDevice] systemVersion] floatValue] < 6.0f)) {
        SEL udidSelector = NSSelectorFromString(@"uniqueIdentifier");
        if ([[UIDevice currentDevice] respondsToSelector:udidSelector]) {
            systemId = [[UIDevice currentDevice] performSelector:udidSelector];
        }
    }
    else {
        systemId = [NSUUID UUID];
    }
    return systemId;
}

虽然不完美,但却是UDID的最佳和最接近的替代品之一(在Swift中使用iOS 8.1和Xcode 6.1):

生成一个随机UUID

let strUUID: String = NSUUID().UUIDString

并使用KeychainWrapper库:

给keychain添加一个字符串值:

let saveSuccessful: Bool = KeychainWrapper.setString("Some String", forKey: "myKey")

从keychain中检索字符串值:

let retrievedString: String? = KeychainWrapper.stringForKey("myKey")

从keychain中删除一个字符串值:

let removeSuccessful: Bool = KeychainWrapper.removeObjectForKey("myKey")

该解决方案使用了keychain,因此存储在keychain中的记录将被持久化,即使在应用程序卸载和重新安装之后。删除该记录的唯一方法是重置设备的所有内容和设置。这就是为什么我提到这个替代方案并不完美,但仍然是iOS 8.1上使用Swift替代UDID的最佳方案之一。

根据@moonlight提出的链接,我做了几次测试,这似乎是最好的解决方案。正如@DarkDust所说,该方法将检查始终可用的en0。 有两种选择: uniqueDeviceIdentifier (MAC+CFBundleIdentifier的MD5) 和uniqueGlobalDeviceIdentifier(MAC的MD5),这些总是返回相同的值。 下面是我所做的测试(用真正的设备):

#import "UIDevice+IdentifierAddition.h"

NSLog(@"%@",[[UIDevice currentDevice] uniqueDeviceIdentifier]);
NSLog(@"%@",[[UIDevice currentDevice] uniqueGlobalDeviceIdentifier]);

XXXX21f1f19edff198e2a2356bf4XXXX - (WIFI)UDID XXXX7dc3c577446a2bcbd77935bdXXXX - (WIFI)GlobalAppUDID XXXX21f1f19edff198e2a2356bf4XXXX - (3G)UDID XXXX7dc3c577446a2bcbd77935bdXXXX - (3G)GlobalAppUDID XXXX21f1f19edff198e2a2356bf4XXXX - (GPRS)UDID XXXX7dc3c577446a2bcbd77935bdXXXX - (GPRS)GlobalAppUDID XXXX21f1f19edff198e2a2356bf4XXXX - (AirPlane mode)UDID XXXX7dc3c577446a2bcbd77935bdXXXX - (AirPlane mode)GlobalAppUDID XXXX21f1f19edff198e2a2356bf4XXXX - (Wi-Fi)after removing and reinstalling the app XXXX7dc3c577446a2bcbd77935bdXXXX (Wi-Fi) after removing and installing the app

希望对大家有用。

编辑: 正如其他人指出的那样,这个解决方案在iOS 7中不再有用,因为uniqueIdentifier不再可用,查询MAC地址现在总是返回02:00:00:00:00:00