参考

苹果禁止直接使用设备的UUID，推荐使用CFUUID生成用户的唯一标示，代码如下：

    const char* function getUUID(){
        NSString *uuid = [[NSUserDefaults standardUserDefaults] objectForKey:@"me.ouyang.testapp"];
        if (uuid) {
        }else{
            CFUUIDRef uuidRef = CFUUIDCreate(NULL);
            CFStringRef stringRef = CFUUIDCreateString(NULL, uuidRef);
            CFRelease(uuidRef);
            uuid = (NSString*)stringRef;
            [[NSUserDefaults standardUserDefaults] setObject:uuid forKey:@"me.ouyang.testapp"];
        }
        return [uuid UTF8String];
    }

如果用户重新安装应用或者卸载了应用，上面生成的UUID就会丢失。
可以把uuid存入KeyChain，只要用户不重装系统，那么这个UUID都会一直存在。写入KeyChain需要借助SSKeychain

    const char* function getUUID(){
        NSError *error = nil;
        NSString *uuid = [SSKeychain passwordForService:@"me.ouyang.testapp" account:@"uuid" error:&error];
        if(uuid){
    }else {
        CFUUIDRef uuidRef = CFUUIDCreate(NULL);
        CFStringRef stringRef = CFUUIDCreateString(NULL, uuidRef);
        CFRelease(uuidRef);
        uuid = (NSString*)stringRef;
        [SSKeychain setPassword:uuid forService:@"me.ouyang.testapp" account:@"uuid"];
    }
    return [uuid UTF8String];
}

Last modified on 2012-06-29