獲取不變的uuid

獲取UUID的方法有很多，但是都會因爲各種原因改變

/**  卸載應用重新安裝後會不一致*/
+ (NSString *)getUUID{
    CFUUIDRef uuid = CFUUIDCreate(NULL);
    NSString *UUID = (__bridge_transfer NSString *)CFUUIDCreateString(NULL, uuid);
    CFRelease(uuid);
    return UUID;
}
 
/**  卸載應用重新安裝後會不一致*/
+ (NSString *)getUUID{
    return [UIDevice currentDevice].identifierForVendor.UUIDString;;
}
 
/** 不會因爲應用卸載改變 
  * 但是用戶在設置-隱私-廣告裏面限制廣告跟蹤後會變成@"00000000-0000-0000-0000-000000000000"
  * 重新打開後會變成另一個，還原廣告標識符也會變
  */
+ (NSString *)getUUID{
    return [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
}

作爲設備唯一的標識符，一言不合就變了肯定是不行的呀

在產品汪的逼迫下，在我不懈的努力下，我終於找到一個可以一直保持一致的方法。第一次獲取成功後保存到鑰匙串，然後每次使用都通過鑰匙串去拿。

第一步，打開應用的鑰匙串權限

Target - Capabilities - KeychainSharing - ON

添加 com.mycompany.myapp.usernamepassword（這個key隨便設置）

第二步，複製粘貼代碼，

先粘.h文件

#import <Foundation/Foundation.h>
 
@interface KeyChainStore : NSObject
+ (void)save:(NSString*)service data:(id)data;
+ (id)load:(NSString*)service;
+ (void)deleteKeyData:(NSString*)service;
@end

再粘.m文件

#import "KeyChainStore.h"
 
@implementation KeyChainStore
 
+ (NSMutableDictionary*)getKeychainQuery:(NSString*)service {
    return[NSMutableDictionary dictionaryWithObjectsAndKeys:
           (id)kSecClassGenericPassword,(id)kSecClass,
           service,(id)kSecAttrService,
           service,(id)kSecAttrAccount,
           (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
           nil];
}
 
+ (void)save:(NSString*)service data:(id)data{
    //Get search dictionary
    NSMutableDictionary*keychainQuery = [self getKeychainQuery:service];
    //Delete old item before add new item
    SecItemDelete((CFDictionaryRef)keychainQuery);
    //Add new object to searchdictionary(Attention:the data format)
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data]forKey:(id)kSecValueData];
    //Add item to keychain with the searchdictionary
    SecItemAdd((CFDictionaryRef)keychainQuery,NULL);
}
 
+ (id)load:(NSString*)service {
    id ret =nil;
    NSMutableDictionary*keychainQuery = [self getKeychainQuery:service];
    //Configure the search setting
    //Since in our simple case we areexpecting only a single attribute to be returned (the password) wecan set the attribute kSecReturnData to kCFBooleanTrue
    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    CFDataRef keyData =NULL;
    if(SecItemCopyMatching((CFDictionaryRef)keychainQuery,(CFTypeRef*)&keyData) ==noErr){
        @try{
            ret =[NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData*)keyData];
        }@catch(NSException *e) {
            NSLog(@"Unarchiveof %@ failed: %@",service, e);
        }@finally{
        }
    }
    if(keyData)
        CFRelease(keyData);
    return ret;
}
 
+ (void)deleteKeyData:(NSString*)service {
    NSMutableDictionary*keychainQuery = [self getKeychainQuery:service];
    SecItemDelete((CFDictionaryRef)keychainQuery);
}
 
@end

第三步，使用(直接調這個方法就可以了)

/**  獲取UUID*/
+ (NSString *)getUUIDByKeyChain{
    // 這個key的前綴最好是你的BundleID
    NSString*strUUID = (NSString*)[KeyChainStore load:@"com.mycompany.myapp.usernamepassword"];
    //首次執行該方法時，uuid爲空
    if([strUUID isEqualToString:@""]|| !strUUID)
    {
        // 獲取UUID 這個是要引入<AdSupport/AdSupport.h>的
        strUUID = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString];
        
        if(strUUID.length ==0 || [strUUID isEqualToString:@"00000000-0000-0000-0000-000000000000"])
        {
            //生成一個uuid的方法
            CFUUIDRef uuidRef= CFUUIDCreate(kCFAllocatorDefault);
            strUUID = (NSString*)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault,uuidRef));
            CFRelease(uuidRef);
        }
        
        //將該uuid保存到keychain
        [KeyChainStore save:@"com.mycompany.myapp.usernamepassword" data:strUUID];
    }
    return strUUID;
}

swfit 版本：

 func getUUIDByKeyChain() -> String {
        var strUUID = KeyChainStore.load("com.mycompany.myapp.usernamepassword") as? String
        if strUUID == Optional<String>.none {
            strUUID = ASIdentifierManager.shared().advertisingIdentifier.uuidString
            if (strUUID as AnyObject).count == 0 || strUUID == "00000000-0000-0000-0000-000000000000" {
                var uuidRef = CFUUIDCreate(kCFAllocatorDefault)
                strUUID = (CFBridgingRetain(CFUUIDCreateString(kCFAllocatorDefault, uuidRef)) as! String)
                uuidRef = nil
            }
            KeyChainStore.save("com.mycompany.myapp.usernamepassword", data: strUUID as Any)
        }
        return strUUID!
    }

無論你怎麼折騰都會保證同一設備每次獲取到的UUID都是一致的，卸載應用，開啓廣告限制跟蹤，系統升級都不會有影響。越獄刷機這種騷操作我沒有測過，即使有問題，感覺這些調皮的用戶也可以忽略了，因爲這個已經是目前最好的解決辦法了，如果大家有什麼更好的解決方案，還請評論區指正。