iOS获取当前AppStore版本号与更新

 - (void)checkUpdateWithAppID:(NSString *)appID success:(void (^)(NSDictionary *resultDic , BOOL isNewVersion ,NSString * newVersion , NSString * currentVersion))success failure:(void (^)(NSError *error))failure{
     AFHTTPSessionManager *manager = [AFHTTPSessionManagermanager];
     manager.requestSerializer=[AFHTTPRequestSerializerserializer];
     manager.responseSerializer=[AFHTTPResponseSerializerserializer];

     //
     NSString *encodingUrl=[[@"http://itunes.apple.com/lookup?id=" stringByAppendingString:@"APP的唯一ID"]stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

     [manager GET:encodingUrl parameters:nilprogress:^(NSProgress *_Nonnull downloadProgress) {

     } success:^(NSURLSessionDataTask *_Nonnull task, id _Nullable responseObject) {

         NSDictionary *resultDic=[NSJSONSerializationJSONObjectWithData:responseObject options:NSJSONReadingMutableLeaveserror:nil];

 //获取AppStore的版本号
         NSString * versionStr =[[[resultDic objectForKey:@"results"]objectAtIndex:]valueForKey:@"version"];

         NSString *versionStr_int=[versionStr stringByReplacingOccurrencesOfString:@"."withString:@""];

         int version=[versionStr_intintValue];

 //获取本地的版本号
         NSDictionary *infoDic=[[NSBundle mainBundle] infoDictionary];

         NSString * currentVersion = [infoDic valueForKey:@"CFBundleShortVersionString"];

         NSString *currentVersion_int=[currentVersion stringByReplacingOccurrencesOfString:@"."withString:@""];

         int current=[currentVersion_int intValue];

         if(version>current){
             success(resultDic,YES, versionStr,currentVersion);
         }else{
             success(resultDic,NO ,versionStr,currentVersion);
         }
     } failure:^(NSURLSessionDataTask *_Nullable task, NSError *_Nonnull error) {
         failure(error);
     }];
 }

 //  调用

 VersionUpdate *tool=[[VersionUpdatealloc]init];
     __weaktypeof(self)weakSelf=self;
     [tool checkUpdateWithAppID:@""success:^(NSDictionary *resultDic,BOOL isNewVersion, NSString *newVersion , NSString * currentVersion) {
         if (isNewVersion) {//表示要更新版本
             NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];
             NSString *key=[NSString stringWithFormat:@"%@%@",currentVersion,newVersion];
             NSString *value=[s.versionUpdateMessage objectForKey:key];
             int time =[value intValue];
             if (time<&&_versionUpdateVC==nil) {//小于三次可以继续弹框
                 time+=;
                 [dict setValue:[NSString stringWithFormat:@"%d",time]forKey:key];
                 s.versionUpdateMessage=[NSDictionary dictionaryWithDictionary:dict];
                 _versionUpdateVC = [[VersionUpdateController alloc]initWithContent:[[[resultDic objectForKey:@"results"]firstObject]objectForKey:@"releaseNotes"]];//releaseNotes,AppStore上面的APP更新内容
                 [_versionUpdateVC addSelfFromSuperWithVersionStr:newVersion];
             }else{//大于三次不做任何操作
                 [weakSelf joinGroupView];
             }
         }
     } failure:^(NSError *error) {
         [weakSelf joinGroupView];
     }];