ios 设备唯一标示

1.1很多时候，我们需要拿到手机唯一识别号来进行网络请求处理风控，下面介绍一个拿到手机唯一识别号的方法

1.1.2 首先将三方库SAMKeychain导入到项目中，然后新建工具类,提供一个类方法

+ (NSString *) generateUUID {
    NSString *uuid = [WXTool getDeviceId];
    if (![NSString isNullOrEmpty:uuid]) {
        return uuid;
    }
    
    NSError *error;
    SAMKeychainQuery *query = [[SAMKeychainQuery alloc] init];
    uuid = [[NSUUID UUID] UUIDString];
    // New item
    query = [[SAMKeychainQuery alloc] init];
    query.password = uuid;
    query.service = kSSKeychainServiceName;
    query.account = kSSKeychainAccountName;
    query.label = kSSKeychainLabel;
    
    if (![query save:&error]) {
        DLog(@"Unable to save item: %@", error);
    }
    return uuid;
}

+ (NSString *)getDeviceId {
    NSError *error;
    // Look up
    SAMKeychainQuery *query = [[SAMKeychainQuery alloc] init];
    query.service = kSSKeychainServiceName;
    query.account = kSSKeychainAccountName;
    query.password = nil;
    
    [query fetch:&error];
    if (error) {
        DLog(@"Network -- Unable to fetch keychain item: %@", error);
    }
    NSString *password = query.password;
    if ([NSString isNullOrEmpty:password]) {
        password = @"";
    }
    return password;
}