iOS 獲取當前app的 App Store 版本號

NSString * strurl = [[NSString alloc] initWithFormat:@"http://itunes.apple.com/lookup?id=%@",AppIDs];//替換為自己App的ID
        NSURLSession *session=[NSURLSession sharedSession];
        NSURL *url = [NSURL URLWithString:strurl];
        
        //3.創建可變的請求對象
        NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:url];
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error){
            //8.解析數據
            NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
            NSArray * results = dict[@"results"];
            NSDictionary * dic = results.firstObject;
            NSString * lineVersion = dic[@"version"];//版本號
            NSString * releaseNotes = dic[@"releaseNotes"];//更新說明
            NSString * trackViewUrl = dic[@"trackViewUrl"];//鏈接
            NSLog(@"App store版本號:%@",lineVersion);
            NSLog(@"更新說明:%@",releaseNotes);
            NSLog(@"App下載鏈接:%@",trackViewUrl);
            
            NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
            //獲取字符串中的數字
            self.applocalversion = [[self.applocalversion componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];//本地的app版本
            lineVersion = [[lineVersion componentsSeparatedByCharactersInSet:nonDigitCharacterSet] componentsJoinedByString:@""];//App store的app版本
            NSLog(@"結果是本地的app版本:%@ \n App store的app版本:%@ ",self.applocalversion,lineVersion);
            
            // 獲取NSUserDefaults對象
            NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
            [defaults setObject:lineVersion forKey:@"App_store_version"];
            [defaults synchronize];  //如果要立刻保存就需要這行代碼
            
            if ([lineVersion integerValue]>[self.applocalversion integerValue]) {//App store的app版本>//本地的app版本 時要提醒升級
                dispatch_async(dispatch_get_main_queue(), ^{
                    self.nav.tabBarItem.badgeValue = @"new";
                });
            }else{
                NSLog(@"111沒有新版本不用更新提示");
            }
            
        }];
        //7.執行任務
        [dataTask resume];