可以帮助: 使用下面的代码，它将永远是唯一的，除非你擦除(格式)你的设备。

objective - c:

选项1:这将在每次安装时更改

UIDevice *uuid = [NSUUID UUID].UUIDString;

选项2:这将是唯一的每个供应商/开发者苹果帐户

UIDevice *myDevice = [UIDevice currentDevice];
NSString *uuid = [[myDevice identifierForVendor] UUIDString];

斯威夫特5。X:

选项1:这将在每次安装时更改

let uuid = UUID().uuidString

选项2:这将是唯一的每个供应商/开发者苹果帐户

let myDevice = UIDevice.current
let uuid = myDevice.identifierForVendor?.uuidString

看看这个，

我们可以使用Keychain来代替NSUserDefaults类，来存储CFUUIDCreate创建的UUID。

这样我们就可以避免重新安装UUID， 即使用户卸载并重新安装，也始终为同一应用程序获得相同的UUID。

用户重置设备时将重新创建UUID。

我用SFHFKeychainUtils尝试了这种方法，它的工作就像一个魅力。

获得UDID的有效方法:

Launch a web server inside the app with two pages: one should return specially crafted MobileConfiguration profile and another should collect UDID. More info here, here and here. You open the first page in Mobile Safari from inside the app and it redirects you to Settings.app asking to install configuration profile. After you install the profile, UDID is sent to the second web page and you can access it from inside the app. (Settings.app has all necessary entitlements and different sandbox rules).

一个使用RoutingHTTPServer的例子:

import UIKit
import RoutingHTTPServer

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var bgTask = UIBackgroundTaskInvalid
    let server = HTTPServer()

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        application.openURL(NSURL(string: "http://localhost:55555")!)
        return true
    }

    func applicationDidEnterBackground(application: UIApplication) {
        bgTask = application.beginBackgroundTaskWithExpirationHandler() {
            dispatch_async(dispatch_get_main_queue()) {[unowned self] in
                application.endBackgroundTask(self.bgTask)
                self.bgTask = UIBackgroundTaskInvalid
            }
        }
    }
}

class HTTPServer: RoutingHTTPServer {
    override init() {
        super.init()
        setPort(55555)
        handleMethod("GET", withPath: "/") {
            $1.setHeader("Content-Type", value: "application/x-apple-aspen-config")
            $1.respondWithData(NSData(contentsOfFile: NSBundle.mainBundle().pathForResource("udid", ofType: "mobileconfig")!)!)
        }
        handleMethod("POST", withPath: "/") {
            let raw = NSString(data:$0.body(), encoding:NSISOLatin1StringEncoding) as! String
            let plistString = raw.substringWithRange(Range(start: raw.rangeOfString("<?xml")!.startIndex,end: raw.rangeOfString("</plist>")!.endIndex))
            let plist = NSPropertyListSerialization.propertyListWithData(plistString.dataUsingEncoding(NSISOLatin1StringEncoding)!, options: .allZeros, format: nil, error: nil) as! [String:String]

            let udid = plist["UDID"]! 
            println(udid) // Here is your UDID!

            $1.statusCode = 200
            $1.respondWithString("see https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/iPhoneOTAConfiguration/ConfigurationProfileExamples/ConfigurationProfileExamples.html")
        }
        start(nil)
    }
}

下面是udid.mobileconfig的内容:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>PayloadContent</key>
        <dict>
            <key>URL</key>
            <string>http://localhost:55555</string>
            <key>DeviceAttributes</key>
            <array>
                <string>IMEI</string>
                <string>UDID</string>
                <string>PRODUCT</string>
                <string>VERSION</string>
                <string>SERIAL</string>
            </array>
        </dict>
        <key>PayloadOrganization</key>
        <string>udid</string>
        <key>PayloadDisplayName</key>
        <string>Get Your UDID</string>
        <key>PayloadVersion</key>
        <integer>1</integer>
        <key>PayloadUUID</key>
        <string>9CF421B3-9853-9999-BC8A-982CBD3C907C</string>
        <key>PayloadIdentifier</key>
        <string>udid</string>
        <key>PayloadDescription</key>
        <string>Install this temporary profile to find and display your current device's UDID. It is automatically removed from device right after you get your UDID.</string>
        <key>PayloadType</key>
        <string>Profile Service</string>
    </dict>
</plist>

配置文件安装将失败(我没有费心实现预期的响应，请参阅文档)，但应用程序将获得正确的UDID。你还应该在mobileconfig上签名。

从iOS 7开始，苹果在所有公共api中都隐藏了UDID。任何以FFFF开头的UDID都是假ID。以前工作的“发送UDID”应用程序不能再用于为测试设备收集UDID。(叹息)

当设备连接到XCode(在管理器中)时，UDID会显示出来，当设备连接到iTunes时(尽管你必须单击“Serial Number”才能显示标识符)。

如果你需要获取设备的UDID来添加到配置配置文件中，并且不能自己在XCode中完成，你将不得不从iTunes中复制/粘贴它。

自iOS 7发布以来，是否有一种方法可以在PC/Mac上不使用iTunes获得UDID ?

下面的代码有助于获得UDID:

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

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;

}