为什么我的唯一设备ID会发生变化？ [英] Why did my unique device ID change?

问题描述

我使用以下方法大约一个月没有问题。即使在卸载应用程序后，设备ID仍保持不变。最近我注意到我的设备ID已更改。我最近在Xcode6上做了很多应用程序的构建。这可能是一个原因吗？我希望我知道它何时改变了。它让我感到意外。当应用程序进入应用程序商店时，我有什么可担心的吗？也许这只是一个Xcode构建问题？我只是想找一种简单的方法来保证唯一的设备ID。我会使用advertisingIdentifer，但我听说将其用于其他目的，然后广告将被app store拒绝。以下是代码：

I have been using the following method for around a month with no problem. The device ID remained the same even after uninstalls of the app. Recently I noticed that my device ID changed. I have been doing a lot of builds of the app recently on Xcode6. Could this be a cause? I wish I knew exactly when it changed. It caught me by surprise. Do I have anything to worry about when the app goes on the app store? Maybe this is just an Xcode build problem? I am just looking for a simple way to guarantee a unique device ID. I would use advertisingIdentifer but I hear using it for purpose other then advertisements will get rejected by app store. Here is the code:

+ (NSString *)getUserID
{
    NSString *Appname = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];
    NSString *retrieveuuid = [SSKeychain passwordForService:Appname account:@"user"];

    if(retrieveuuid == NULL)
    {
        CFUUIDRef newUniqueId = CFUUIDCreate(kCFAllocatorDefault);
        retrieveuuid = (__bridge_transfer NSString*)CFUUIDCreateString(kCFAllocatorDefault, newUniqueId);
        CFRelease(newUniqueId);
        [SSKeychain setPassword:retrieveuuid forService:Appname account:@"user"];
    }

    NSLog(@"%@", retrieveuuid);
    return retrieveuuid;
}

推荐答案

唯一的设备ID没有坚持这已经被问过很多次了，你应该在这里找到一些好的信息。快速谷歌搜索会带来以下内容。

The unique device id does not persist This has been asked many times before and you should find some good info on here. A quick Google search brings up the following.

https://stackoverflow.com/search?q = iOS + UDID +替换

iOS 7的持久性UDID等价物？

UIDevice uniqueIdentifier已弃用 - 现在该怎么办？

iOS唯一用户标识符

一般建议是使用 CFUUID 创建你自己的 UUID ，然后将其保存在 keychain

general advice is to use CFUUID to create your own UUID, then persist it in the keychain

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