如何在iOS SDK中检查用户设备

Question

我正在尝试修复我的应用程序中的Sim交换问题。我想要一个独特的方式来识别用户的手机。所以因下列案件而受到审判

• 我知道我们无法从用户设备获得电话IMEI和其他信息，如下链接所示

Link1 Link2

• 我可以使用identifierForVendor，但它也改变了每次安装应用程序。
• 第三种选择是使用DeviceCheck API来识别设备，但它只在iOS 11中出现。

请让我知道如何识别一个用户设备&临时禁用用户的帐户，以防Sim交换。

Answer 1

您将不得不将UUID保存到密钥链中，因为密钥链数据在卸载应用程序后仍然存在。

iOS将密钥链信息作为敏感信息管理。您可以使用SwiftKeychainWrapper库轻松访问密钥链。

苹果博士在SIM变更上说了什么：https://developer.apple.com/documentation/coretelephony/cttelephonynetworkinfo

CodingExample:

let uuid = UIDevice.current.identifierForVendor?.uuidString
KeychainWrapper.standard.set(uuid, forKey: "appUUID")

，无论何时您想得到appUUID，只需从密钥链中获取：

let uuid = KeychainWrapper.standard.string(forKey: "appUUID")

注意:您还可以检查在重新安装应用程序后是否更改了UUID，并将其更新为密钥链。

Answer 2

一个可接受的解决方案是生成一个唯一的UUID并将其保存到密钥链中，即使在应用程序删除之后，密钥链项仍然存在。

/* DeviceUID.h
#import <Foundation/Foundation.h>

@interface DeviceUID : NSObject
+ (NSString *)uid;
@end
*/


// Device.m
#import "DeviceUID.h"

@import UIKit;

@interface DeviceUID ()

@property(nonatomic, strong, readonly) NSString *uidKey;
@property(nonatomic, strong, readonly) NSString *uid;

@end

@implementation DeviceUID

@synthesize uid = _uid;

#pragma mark - Public methods

+ (NSString *)uid {
    return [[[DeviceUID alloc] initWithKey:@"deviceUID"] uid];
}

#pragma mark - Instance methods

- (id)initWithKey:(NSString *)key {
    self = [super init];
    if (self) {
        _uidKey = key;
        _uid = nil;
    }
    return self;
}

/*! Returns the Device UID.
    The UID is obtained in a chain of fallbacks:
      - Keychain
      - NSUserDefaults
      - Apple IFV (Identifier for Vendor)
      - Generate a random UUID if everything else is unavailable
    At last, the UID is persisted if needed to.
 */
- (NSString *)uid {
    if (!_uid) _uid = [[self class] valueForKeychainKey:_uidKey service:_uidKey];
    if (!_uid) _uid = [[self class] valueForUserDefaultsKey:_uidKey];
    if (!_uid) _uid = [[self class] appleIFV];
    if (!_uid) _uid = [[self class] randomUUID];
    [self save];
    return _uid;
}

/*! Persist UID to NSUserDefaults and Keychain, if not yet saved
 */
- (void)save {
    if (![DeviceUID valueForUserDefaultsKey:_uidKey]) {
        [DeviceUID setValue:self.uid forUserDefaultsKey:_uidKey];
    }
    if (![DeviceUID valueForKeychainKey:_uidKey service:_uidKey]) {
        [DeviceUID setValue:self.uid forKeychainKey:_uidKey inService:_uidKey];
    }
}

#pragma mark - Keychain methods

/*! Create as generic NSDictionary to be used to query and update Keychain items.
 *  param1
 *  param2
 */
+ (NSMutableDictionary *)keychainItemForKey:(NSString *)key service:(NSString *)service {
    NSMutableDictionary *keychainItem = [[NSMutableDictionary alloc] init];
    keychainItem[(__bridge id)kSecClass] = (__bridge id)kSecClassGenericPassword;
    keychainItem[(__bridge id)kSecAttrAccessible] = (__bridge id)kSecAttrAccessibleAlways;
    keychainItem[(__bridge id)kSecAttrAccount] = key;
    keychainItem[(__bridge id)kSecAttrService] = service;
    return keychainItem;
}

/*! Sets
 *  param1
 *  param2
 */
+ (OSStatus)setValue:(NSString *)value forKeychainKey:(NSString *)key inService:(NSString *)service {
    NSMutableDictionary *keychainItem = [[self class] keychainItemForKey:key service:service];
    keychainItem[(__bridge id)kSecValueData] = [value dataUsingEncoding:NSUTF8StringEncoding];
    return SecItemAdd((__bridge CFDictionaryRef)keychainItem, NULL);
}

+ (NSString *)valueForKeychainKey:(NSString *)key service:(NSString *)service {
    OSStatus status;
    NSMutableDictionary *keychainItem = [[self class] keychainItemForKey:key service:service];
    keychainItem[(__bridge id)kSecReturnData] = (__bridge id)kCFBooleanTrue;
    keychainItem[(__bridge id)kSecReturnAttributes] = (__bridge id)kCFBooleanTrue;
    CFDictionaryRef result = nil;
    status = SecItemCopyMatching((__bridge CFDictionaryRef)keychainItem, (CFTypeRef *)&result);
    if (status != noErr) {
        return nil;
    }
    NSDictionary *resultDict = (__bridge_transfer NSDictionary *)result;
    NSData *data = resultDict[(__bridge id)kSecValueData];
    if (!data) {
        return nil;
    }
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}

#pragma mark - NSUserDefaults methods

+ (BOOL)setValue:(NSString *)value forUserDefaultsKey:(NSString *)key {
    [[NSUserDefaults standardUserDefaults] setObject:value forKey:key];
    return [[NSUserDefaults standardUserDefaults] synchronize];
}

+ (NSString *)valueForUserDefaultsKey:(NSString *)key {
    return [[NSUserDefaults standardUserDefaults] objectForKey:key];
}

#pragma mark - UID Generation methods

+ (NSString *)appleIFA {
    NSString *ifa = nil;
    Class ASIdentifierManagerClass = NSClassFromString(@"ASIdentifierManager");
    if (ASIdentifierManagerClass) { // a dynamic way of checking if AdSupport.framework is available
        SEL sharedManagerSelector = NSSelectorFromString(@"sharedManager");
        id sharedManager = ((id (*)(id, SEL))[ASIdentifierManagerClass methodForSelector:sharedManagerSelector])(ASIdentifierManagerClass, sharedManagerSelector);
        SEL advertisingIdentifierSelector = NSSelectorFromString(@"advertisingIdentifier");
        NSUUID *advertisingIdentifier = ((NSUUID* (*)(id, SEL))[sharedManager methodForSelector:advertisingIdentifierSelector])(sharedManager, advertisingIdentifierSelector);
        ifa = [advertisingIdentifier UUIDString];
    }
    return ifa;
}

+ (NSString *)appleIFV {
    if(NSClassFromString(@"UIDevice") && [UIDevice instancesRespondToSelector:@selector(identifierForVendor)]) {
        // only available in iOS >= 6.0
        return [[UIDevice currentDevice].identifierForVendor UUIDString];
    }
    return nil;
}

+ (NSString *)randomUUID {
    if(NSClassFromString(@"NSUUID")) {
        return [[NSUUID UUID] UUIDString];
    }
    CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);
    CFStringRef cfuuid = CFUUIDCreateString(kCFAllocatorDefault, uuidRef);
    CFRelease(uuidRef);
    NSString *uuid = [((__bridge NSString *) cfuuid) copy];
    CFRelease(cfuuid);
    return uuid;
}

@end

来源：https://medium.com/@miguelcma/persistent-cross-install-device-identifier-on-ios-using-keychain-ac9e4f84870f