iOS 獲取裝置唯一識別碼 IDFV+keychain
阿新 • • 發佈:2018-12-11
最近專案中需要獲取到裝置的唯一標誌傳送給後臺儲存備用,在UDID UUID IDFA等都存在諸多問題(什麼問題可以自己查閱資料)的情況下,選擇了 IDFV+keychain(當然特殊情況下也存在些許問題,但基本無影響,非常夠用)。
identifierForVendor是apple給供應商唯一的一個值,也就是說同一個公司發行的的app在相同的裝置上執行的時候會有這個相同的識別符號。然而,如果使用者刪除了這個供應商的所有app然後再重新安裝的話,這個識別符號就會不一致。所以要結合keychain使用,在第一次使用App的時候把 IDFV存到keychain中,以後即使APP寫在重灌,我們只需要從keychain中取跟我們APP相關聯的IDFV值就可以了,這樣既保證了唯一性有保證了永續性。
廢話不多說,下面直接來說怎麼實現!
IDFV的獲取方法:
NSString *identifierForVendor = [[UIDevice currentDevice].identifierForVendor UUIDString];
我們現在把IDFV+keychain封裝成一個工具類:
新建一個繼承自NSObject的類 IDFVTools 用來封裝我們的IDFV+keychain
類中匯入 #import <UIKit/UIKit.h> 不然呼叫 UIDevice 會報錯
在IDFVTools.h中
+ (void)save:(NSString *)service data:(id)data; + (id)load:(NSString *)service; + (void)delete:(NSString *)service; + (NSString *)getIDFV;
在IDFVTools.m中
+ (NSString *)getIDFV { //定義存入keychain中的賬號 一個標識 表示是某個app儲存的內容 bundle id最好 NSString * const KEY_USERNAME = @"com.wdw.zzzz.username"; NSString * const KEY_PASSWORD = @"com.wdw.zzzz.password"; //測試用 清除keychain中的內容 //[IDFVTools delete:KEY_USERNAME_PASSWORD]; //讀取賬號中儲存的內容 NSMutableDictionary *readUserDataDic = (NSMutableDictionary *)[IDFVTools load:KEY_USERNAME]; //NSLog(@"keychain==%@",readUserDataDic); if (!readUserDataDic) {//如果是第一次 肯定獲取不到 這個時候就儲存一個 NSString *deviceIdStr = [[[UIDevice currentDevice] identifierForVendor] UUIDString];//獲取IDFV //NSLog(@"identifierStr==%@",identifierStr); NSMutableDictionary *needSaveDataDic = [NSMutableDictionary dictionaryWithObject:deviceIdStr forKey:KEY_PASSWORD]; //進行儲存 並返回這個資料 [IDFVTools save:KEY_USERNAME data:needSaveDataDic]; return deviceIdStr; } else{return [readUserDataDic objectForKey:KEY_PASSWORD];} } //儲存 + (void)save:(NSString *)service data:(id)data { //Get search dictionary NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; //Delete old item before add new item SecItemDelete((__bridge CFDictionaryRef)keychainQuery); //Add new object to search dictionary(Attention:the data format) [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(__bridge id)kSecValueData]; //Add item to keychain with the search dictionary SecItemAdd((__bridge CFDictionaryRef)keychainQuery, NULL); } + (NSMutableDictionary *)getKeychainQuery:(NSString *)service { return [NSMutableDictionary dictionaryWithObjectsAndKeys: (__bridge id)kSecClassGenericPassword,(__bridge id)kSecClass, service, (__bridge id)kSecAttrService, service, (__bridge id)kSecAttrAccount, (__bridge id)kSecAttrAccessibleAfterFirstUnlock,(__bridge id)kSecAttrAccessible, nil]; } //取出 + (id)load:(NSString *)service { id ret = nil; NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; //Configure the search setting //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue [keychainQuery setObject:(__bridge id)kCFBooleanTrue forKey:(__bridge id)kSecReturnData]; [keychainQuery setObject:(__bridge id)kSecMatchLimitOne forKey:(__bridge id)kSecMatchLimit]; CFDataRef keyData = NULL; if (SecItemCopyMatching((__bridge CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) { @try { ret = [NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData *)keyData]; } @catch (NSException *e) {NSLog(@"Unarchive of %@ failed: %@", service, e);} @finally {} } if (keyData) CFRelease(keyData); return ret; } //刪除 + (void)delete:(NSString *)service { NSMutableDictionary *keychainQuery = [self getKeychainQuery:service]; SecItemDelete((__bridge CFDictionaryRef)keychainQuery); }
哪裡需要呼叫只需要
[IDFVTools getIDFV];
彩蛋!
除了上述方式還有一個操作鑰匙串的好用的第三方,就是SAMKeychain!
如果你的專案用了cocopods 那麼可以直接下載 具體可以看這裡:
如果你的專案第三方框架都是手動匯入 不喜歡用cocopods 可以直接參考gitHub:
呼叫的時候我們可以封裝成一個方法:
+ (NSString *)getUniqueDevice
{
NSString *appName=[[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleNameKey];
NSString *strApplicationUUID = [SAMKeychain passwordForService:appName account:account];
if (strApplicationUUID == nil)
{
strApplicationUUID = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
NSError *error = nil;
SAMKeychainQuery *query = [[SAMKeychainQuery alloc] init];
query.service = appName;
query.account = account;
query.password = strApplicationUUID;
query.synchronizationMode = SAMKeychainQuerySynchronizationModeNo;
[query save:&error];
}
return strApplicationUUID;
}