onecable_ios_user/OneCable/Classes/ViewControllers/ThingsScreens/ThingsDetailViewController.m

    //
//  ThingsDetailViewController.m
//  kneet
//
//  Created by Jason Lee on 3/16/15.
//  Copyright (c) 2015 ntels. All rights reserved.
//
#import "RequestHandler.h"
#import "DeviceModel.h"

#import "CustomImageView.h"
#import "CustomLabel.h"
#import "CustomTextField.h"
#import "CustomButton.h"
#import "UIImageView+WebCache.h"
#import "CustomTableView.h"
#import "ChangeDeviceNamePopupView.h"

#import "ValidateUtil.h"
#import "CommandClassControlDetailView.h"

#import "ThingsViewController.h"
#import "ThingsDetailViewController.h"
#import "ModifyDeviceNamePopupView.h"
#import "JYPullToRefreshController.h"

#import "ThingsForcedDelViewController.h"
#import "ThingsGeneralDelViewController.h"
/**
 
 Hub 명 Text Color       : kUITextColor03
 Update 알람 Text Color  : kUITextColor04
 
 Device 상태 표시 Text Color
    - 꺼짐 : kUITextColor01
    - 켜짐 : kUITextColor02
    - 잠김 : kUITextColor02
    - 열림 : kUITextColor01
 
 도어센서 마지막 동작 Text Color : kUITextColor01
 도어센서 상태표시 Text Color
    - 열림 : kUITextColor02
    - 닫힘 : kUITextColor01
 
 Offline Text Color : kUITextColor01
 노드명 표시 Text Color  : kUITextColor03
 value 표시 Text Color : kUITextColor04
 
 
 (이미지 명)
 플러그 on   : img_things_detail_06_01_plug_state_on
 플러그 off  : img_things_detail_06_01_plug_state_off
 밸브  on    : img_things_detail_05_02_valve_state_locked
 밸브  off   : img_things_detail_05_02_valve_state_unlocked
 도어센서 on  : img_things_detail_01_02_sensor_door_open
 도어센서 off : img_things_detail_01_02_sensor_door_close
 
 장치 열림,켜짐 : img_things_detail_06_99_btn_off ,~off_press
 장치 닫힘,꺼짐 : img_things_detail_06_99_btn_on ,~on_press
 
 기기 배터리 부족시 사용할 폰트 칼라
 color_text_07 (#ed1c24)
 
 **/

@implementation ThingsDetailTitleTableViewCell

@end

@implementation ThingsDetailControlTableViewCell

- (void)awakeFromNib {
    [super awakeFromNib];
    _controlContainer.pagingEnabled = YES;
    _controlContainer.scrollEnabled = NO;
    _pageControl.hidden = YES;
}

@end

@implementation ThingsDetailOptionTableViewCell

@end

@implementation ThingsDetailDeviceIdTableViewCell

@end


@interface ThingsDetailViewController () <UITableViewDataSource, UITableViewDelegate ,changeDeviceNameDelegate> {
    
    DeviceDetailModel *_deviceDetail;
//    ModifyDeviceNamePopupView *_mpopup;
    NSArray<NodeModel> *_mandatoryNodes, *_optionalNodes;
    UIPageControl *_pageControl;
    
    NSTimer *_deviceBackgroundTimer;
}

@property (strong, nonatomic) JYPullToRefreshController *refreshController;

@end


#pragma mark - Class Definition

@implementation ThingsDetailViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self initUI];
    [self prepareViewDidLoad];
}

- (void)initUI {
    
    //initialize tableView
    [self initTableViewAsDefaultStyle:_tableView];
    _tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, IPHONE_WIDTH, 30.0f)];
    
//    [self setThingsDetailPopoverOptions];
    
    [self initRefreshController];
    [self setMoreBtnArray];
}

- (void)initRefreshController {
    //set refresh controls
    __weak typeof(self) weakSelf = self;
    self.refreshController = [[JYPullToRefreshController alloc] initWithScrollView:self.tableView];
    self.refreshController.pullToRefreshHandleAction = ^{
        [weakSelf requestDeviceDetail:@YES];
    };
}


//- (void)setThingsDetailPopoverOptions {
//    //set Popover Contents
//    __weak typeof(self) weakSelf = self;
//    _popooverOptionArray = [[NSMutableArray alloc] init];
//
//    [_popooverOptionArray addObject:@{@"menuName" : NSLocalizedString(@"새로 고침",nil),
//                                      @"iconName": @"img_bg_morepopup_icon_refresh",
//                                      @"target": weakSelf,
//                                      @"selector": [NSValue valueWithPointer:@selector(requestDeviceDetail:)]}];
//    
//    if ([JDFacade facade].loginUser.level > 10) {
//        [_popooverOptionArray addObject:@{@"menuName" : NSLocalizedString(@"이름 변경", @"이름 변경"),
//                                          @"iconName": @"img_bg_morepopup_icon_edit",
//                                          @"target": weakSelf,
//                                          @"selector": [NSValue valueWithPointer:@selector(modifyDeviceName)]}];
//
//    }
//}

- (void)prepareViewDidLoad {
    
    [self requestDeviceDetail:@YES];
}

//- (void)modifyDeviceName {
//    
//    _mpopup = [[ModifyDeviceNamePopupView alloc] initFromNib];
//    _mpopup.txtDeviceName.text = _deviceDetail.deviceName;
//    
//    [_mpopup showWithCompletion:^(CustomAlertView *alertView, NSInteger buttonIndex) {
//        if (buttonIndex == 0) {//OK
//            [self requestDeviceUpdate];
//        }
//    }];
//}

- (void)changeDeviceName:(NSString *)deviceName {
    [self requestDeviceDetail:@YES];
    _lblTitle.text = [deviceName isEqualToString:@""] ? _deviceDetail.prdName : deviceName;
}

- (void)updateTitle {
    
    [self setMoreBtnArray];
    
    if ([_deviceDetail.prdName isEqualToString:_deviceDetail.prdUserName] || [_deviceDetail.prdUserName isEqualToString:@""]) {
        _lblTitle.text = _deviceDetail.prdName;
    } else {
        _lblTitle.text = _deviceDetail.prdUserName;
    }
    
    _btnUpdate.hidden = !_deviceDetail.isProfileUpdate;

    
    if (![JDFacade facade].loginUser.isHomehubOnline) {
        _lblTitle.text = @"홈허브 오프라인";
        [_lblTitle setColor:kUITextColor01 text:_lblTitle.text];
        return;
    }
    
    if (_deviceDetail && !_deviceDetail.isOnline) {
        _lblTitle.text = @"장치 상태를 확인하세요";
        [_lblTitle setColor:kUITextColor02 text:_lblTitle.text];
        return;
    }
}

-(NSString *)getDeviceDetailUrl
{
    NSMutableArray *arr = [NSMutableArray array];
    arr[0] = _refDevice.deviceId;
    arr[1] = _refDevice.nodeId;
    
    return [[JDFacade facade] getUrlWithCustAndGroupID:API_GET_NODE_DETAIL arguments:arr];
}

#pragma mark - Main Logic
- (void)requestDeviceDetail:(id)arg {
    
    BOOL showLoadingView = NO;
    if (arg) {
        showLoadingView = [arg isKindOfClass:[NSTimer class]] ? [((NSTimer *)arg).userInfo boolValue] : [arg boolValue];
    }

    NSString *path = [NSString stringWithFormat:[self getDeviceDetailUrl], _refDevice.deviceId];
    
    [[RequestHandler handler] sendAsyncRequestAPIPath:path method:ksHTTPRequestGET parameters:nil
                                           modelClass:[DeviceDetailModel class] showLoadingView:showLoadingView completion:^(id responseObject) {
        if (!responseObject) {//응답결과가 잘못되었거나 없을 경우,
            return;
        }

        _deviceDetail = (DeviceDetailModel *)responseObject;
                              
        if (_deviceDetail) {//API 성공 ,
            [self setDeviceContents];
            [self requestPollingDeviceStatusInBackground];
        }
                                               
        //refresh controller
        if (self.refreshController && self.refreshController.refreshState == JYRefreshStateLoading) {
            [self.refreshController stopRefreshWithAnimated:YES completion:nil];
        }
                                               
    } failure:^(id errorObject) {
        
        [self releaseDeviceTimer];
        
        JDErrorModel *error = (JDErrorModel *)errorObject;
        [[JDFacade facade] alert:error.errorMessage];
    }];
}

//디바이스 상태를 3초마다 갱신함.
- (void)requestPollingDeviceStatusInBackground {

    //schedul timer.
//    if (!_deviceBackgroundTimer) {
//        _deviceBackgroundTimer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(requestDeviceDetail:) userInfo:@NO repeats:YES];
//    }
}
    
- (void)setDeviceContents {
    [self updateTitle];
    
    _mandatoryNodes = (NSArray<NodeModel> *)[_deviceDetail.cmdclsList filteredArrayUsingPredicateFormat:@"cmdclsMandatoryYn == %@", @"Y"];
    _optionalNodes = (NSArray<NodeModel> *)[_deviceDetail.cmdclsList filteredArrayUsingPredicateFormat:@"cmdclsMandatoryYn == %@", @"N"];
    
    [_tableView reloadData];
}

//- (void)requestDeviceUpdate {
//    //parameters
//    NSDictionary *parameter = @{@"device_name": _mpopup.txtDeviceName.text};
//
//    NSString *path = [NSString stringWithFormat:API_GET_DEVICE_UPDATE, _deviceDetail.deviceId];
//
//    [[RequestHandler handler] sendAsyncPostRequestAPIPath:path parameters:parameter modelClass:[JDJSONModel class] completion:^(id responseObject) {
//
//        _refDevice.deviceName = _deviceDetail.deviceName = _mpopup.txtDeviceName.text;
//        [_tableView reloadData];
//
//        //리스트를 다시 로드함.
//        ThingsViewController *vc = [[JDFacade facade] viewControllerOnNaviationController:[ThingsViewController class]];
//        [vc.collectionView reloadData];
//
//    } failure:^(id errorObject) {
//        JDErrorModel *error = (JDErrorModel *)errorObject;
//        [[JDFacade facade] alert:error.errorMessage];
//    }];
//}

- (void)requestDeleteDevice {
    //parameters
    NSString *path = [NSString stringWithFormat:API_DELETE_DEVICE, _deviceDetail.deviceId];

    [[RequestHandler handler] sendAsyncRequestAPIPath:path method:ksHTTPRequestDELETE parameters:nil modelClass:[JDJSONModel class] showLoadingView:YES completion:^(id responseObject) {

        [[JDFacade facade] toast:NSLocalizedString(@"장치가 삭제되었습니다", @"장치가 삭제되었습니다")];

//        if ([JDFacade facade].loginHomeGroup.deviceId && ![[JDFacade facade].loginHomeGroup.deviceId isEmptyString]) {
//            if ([[JDFacade facade].loginHomeGroup.deviceId isEqualToString:_deviceDetail.deviceId]) {//현재 홈의 스마튼폰일 경우,
//                [JDFacade facade].loginHomeGroup.deviceId = nil;
//                [JDFacade facade].loginHomeGroup.deviceAuthorization = nil;
//                [JDFacade facade].loginHomeGroup.deviceKey = nil;
//            }
//        }

        //리스트를 다시 로드함.
        ThingsViewController *vc = [[JDFacade facade] viewControllerOnNaviationController:[ThingsViewController class]];
        [vc prepareViewDidLoadRefreshPopup];

        [self.navigationController popToRootViewControllerAnimated:YES];

    } failure:^(id errorObject) {
        
        JDErrorModel *error = (JDErrorModel *)errorObject;
        [[JDFacade facade] alert:error.errorMessage];
    }];
}

#pragma mark - UITableView DataSource & Delegate
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 4;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSInteger count = 1;
    if (section == 1) {
        count = _deviceDetail && _deviceDetail.cmdclsList && _deviceDetail.cmdclsList.count > 0;
    } else if (section == 2) {//optional nodes
        count = _optionalNodes.count; //두번째 이후부터 옵셔널 노드임.
    }
    
    return count;
}

- (CGFloat)heightForMandatoryNode {
    CGFloat height = 0;
    NodeModel *node = _deviceDetail.cmdclsList.firstObject;
    if (node.cmdclsType == CmdClsTypeSwitchBinary || node.cmdclsType == CmdClsTypeValve) {
        height = 347.0f; //275 || 347
    } else {
        height = 275.0f;
    }
    
    height += _mandatoryNodes.count > 1 ? 75 : 0;
    
    return height;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    CGFloat height = 86;
    
    NSInteger section = indexPath.section;
    if (section == 0) {
        height = 68;
    } else if (section == 1) {
//        height = [self heightForMandatoryNode] + 35.0f;
        height = 322;
    } else if (section == 2) {
        height = 63;
//        if (indexPath.row == _deviceDetail.nodes.count - 2) {
//            height += 35;
//        }
    } else if (section == 3) {
        height = 89;
    }
    
    return height;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UITableViewCell *cell = nil;
    NSInteger section = indexPath.section;
    
    if (section == 0) {//title
        ThingsDetailTitleTableViewCell *tcell = (ThingsDetailTitleTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"TitleCellIdentifier"];
        
//        [tcell.imgvDevice sd_setImageWithURL:[NSURL URLWithString:_deviceDetail.imageFileName] placeholderImage:nil options:SDWebImageRefreshCached];
        
        tcell.lblDeviceUpdate.hidden = !_deviceDetail.isProfileUpdate;
        
        //배터리 30이하일때 메세지 우선순위
        NSString *battery = [self getBatteryFromNode];
        if (battery != nil && [battery integerValue] <= 30) {
            
            tcell.lblDeviceUpdate.hidden = NO;
            tcell.lblDeviceUpdate.text = @"배터리를 즉시 교체하세요.";
        }
        
    
        
        cell = tcell;

    } else if (section == 1) {//device control
        ThingsDetailControlTableViewCell *tcell = (ThingsDetailControlTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"ControlCellIdentifier"];
        
        //뷰를 초기화함.
        [[tcell.controlContainer subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
            UIView *subview = (UIView *)obj;
            [subview removeFromSuperview];
        }];
        
        if (_deviceDetail) {
            
            tcell.controlContainer.scrollEnabled = _mandatoryNodes.count > 1;
            tcell.controlContainer.contentSize = CGSizeMake(IPHONE_WIDTH * _mandatoryNodes.count, [self heightForMandatoryNode]);
            tcell.controlContainer.showsHorizontalScrollIndicator = NO;
            
            
            if (tcell.controlContainer.scrollEnabled) {
                tcell.controlContainer.delegate = self;
            }
            
            tcell.pageControl.hidden = !tcell.controlContainer.scrollEnabled;
            if (!tcell.pageControl.hidden && !_pageControl) {
                _pageControl = tcell.pageControl;
                _pageControl.numberOfPages = _mandatoryNodes.count;
            }
            
            __block CGFloat width = 0;
            
            for (NodeModel *node in _mandatoryNodes) {
                node.refDevice = _refDevice;
                
                NSLog(@"node.cmdclsType : %ld", (long)node.cmdclsType);
                
                CommandClassControlView *controlView = [CommandClassControlDetailView viewForCommandClass:node.cmdclsType];
                
                node.deviceId = _deviceDetail.deviceId;
                node.nodeId = _deviceDetail.nodeId;
                controlView.node = node;
                controlView.isMandatoryNode = [node.cmdclsMandatoryYn boolValue] && _mandatoryNodes.count > 1;
                controlView.selectHub = _selectHub;
               
                tcell.controlContainer.hidden = !controlView;
                if (!tcell.controlContainer.hidden) {
                    
                    controlView.x = width;
                    UIView *superview = tcell.controlContainer;
                    [superview addSubview:controlView];
                    
                    [controlView mas_makeConstraints:^(MASConstraintMaker *make) {
                        make.size.mas_equalTo(controlView.frame.size);
                        make.leading.equalTo(superview).offset(width);
//                        make.trailing.equalTo(superview).offset(width+IPHONE_WIDTH);
                        
                        width += IPHONE_WIDTH;
                    }];
                }
            }
        }
        
        cell = tcell;
        
    } else if (section == 2) {//option control
        ThingsDetailOptionTableViewCell *tcell = (ThingsDetailOptionTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"OptionCellIdentifier"];
        
        NodeModel *node = _deviceDetail.cmdclsList[indexPath.row + _mandatoryNodes.count];
        
        //NSLog(@"NodeModel : %@", node);
        
        tcell.lblNodeName.text = node.cmdclsName;
        tcell.lblNodeValue.text = node.contentValueMsg;
        
        cell = tcell;
        
    } else if (section == 3){ // Device Id
        ThingsDetailDeviceIdTableViewCell *tcell = (ThingsDetailDeviceIdTableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"DeviceIdCellIdentifier"];
        
        tcell.lblDeviceName.text = _deviceDetail.deviceModelId;
        tcell.lblDeviceId.text = _deviceDetail.deviceId;
        
        cell = tcell;
    }
    
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [super tableView:tableView didSelectRowAtIndexPath:indexPath];
}

- (void)setMoreBtnArray {
    _moreBtnArray = [NSMutableArray array];
    
    if (![[JDFacade facade].loginUser hasHomeHub]) {
        [_btnOption setHidden:YES];
    }
    
    if([[JDFacade facade].loginUser.gradeCode isEqualToString:KNEET_MEMBER_MASTER]) {
        for (int i = 0; i < 3; i++) {
            MoreBtnModel *btnModel;
            switch (i) {
                case 0:
                    btnModel = [[MoreBtnModel alloc] initWithTyep:NameChange isEnable:YES];
                    break;
                case 1:
                    btnModel = [[MoreBtnModel alloc] initWithTyep:Del isEnable:YES];
                    break;
                case 2:
                    btnModel = [[MoreBtnModel alloc] initWithTyep:Refresh isEnable:YES];
                    break;
                    
                default:
                    break;
            }
            [_moreBtnArray addObject:btnModel];
        }
    } else {
        MoreBtnModel *btnModel = [[MoreBtnModel alloc] initWithTyep:Refresh isEnable:YES];
        [_moreBtnArray addObject:btnModel];
    }
}

- (BOOL)checkOnlineHubAlert {
    
    if (![[JDFacade facade].loginUser onlineHomeHubFromSelectedHub:_selectHub]) {
        
        [[JDFacade facade] alert:@"허브가 오프라인 상태입니다. 허브 상태 확인 후 다시 시도해주세요." completionHander:nil];
        
        return NO;
    }
    
    return YES;
}


- (NSString*)getBatteryFromNode {
    
    for (NodeModel *model in _deviceDetail.cmdclsList) {
        
        NSLog(@"model : %@", model);
        
        if (EQUALS(model.cmdclsId, @"battery")) {
            
            return model.contentValue;
        }
    }
    
    return nil;
}


-(void)deviceDelete
{
    
    if (![self checkOnlineHubAlert]) return ;

    
    if (![_deviceDetail isOnline]) {
        
        ThingsForcedDelViewController *vc = [CommonUtil instantiateViewControllerWithIdentifier:@"ThingsForcedDelViewController" storyboardName:@"Things"];
        
        vc.delDevice = _deviceDetail;
        [self showTransparencyModalView:vc removeSelf:NO];
        
    } else {
        
        ThingsGeneralDelViewController *vc = [CommonUtil instantiateViewControllerWithIdentifier:@"ThingsGeneralDelViewController" storyboardName:@"Things"];
        
        vc.delDevice = _deviceDetail;
        [self showTransparencyModalView:vc removeSelf:NO];
    }
}


-(void)nodeProfileUpdate
{
    SocketRequestModel *request = [[SocketRequestModel alloc] initWithMsgType:MSG_TYPE_NODE_PROFILE_UPDATE];
    NSDictionary *param = @{@"device_id":_refDevice.deviceId,
                            @"node_id":_refDevice.nodeId,
                            @"cust_id": [[JDFacade facade].loginUser custId],
                            @"ctrt_grp_id": [[JDFacade facade].loginUser ctrtGrpId]};
    [request setRequestMsg:param];
    [self sendDataToSocket:request modelClass:[CommandModel class] isLoading:YES];
}


#pragma mark - MoreButtonDelegate
-(void)moreBtnAction:(id)sender
{
    NSInteger tag = [(UIButton *)sender tag];
    NSLog(@"MoreBtn Action : %li", (long)tag);
    switch (tag) {
        case NameChange:
        {
            if (![self checkOnlineHubAlert]) return ;

            ChangeDeviceNamePopupView *popup = [[ChangeDeviceNamePopupView alloc]initFromNib:_deviceDetail];
            popup.deviceDetailModel = _deviceDetail;
            popup.delegate = self;
            [popup show];
        }
            break;
        case Del:
        {
            [self deviceDelete];
        }
            break;
        case Refresh:
        {
            [self requestDeviceDetail:@YES];

        }
            break;
            
        default:
            break;
    }
}

#pragma mark - UI Events
- (IBAction)btnOptionTouched:(id)sender {
//    [self toggleOptions:sender];
    [self toggleOptionsWithArray:sender btnArray:_moreBtnArray];
}

//업데이트
- (IBAction)btnUpdateTouched:(id)sender {
    
    if (![self checkOnlineHubAlert]) return ;

    [[JDFacade facade] confirmTitle:@"장치 업데이트" message:@"지금 장치를 최신 버전으로\n업데이트 하시겠습니까?" btnOKLabel:@"예" btnCancelLabel:@"아니오" completion:^(CustomAlertView *alertView, NSInteger buttonIndex) {
        if (buttonIndex == 0) {
            [self nodeProfileUpdate];
        }
    }];
    
}

- (IBAction)btnCloseTouched:(id)sender {
    [[JDFacade facade] dismissModalStack:YES completion:nil];
}

#pragma mark - ScrollView Delegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat pageWidth = scrollView.frame.size.width; // you need to have a **iVar** with getter for scrollView
    CGFloat fractionalPage = scrollView.contentOffset.x / pageWidth;
    NSInteger page = lround(fractionalPage);
    
    _pageControl.currentPage = page; // you need to have a **iVar** with getter for pageControl
}


-(void) receiveSocketData:(NSNotification *)notification {
    SocketModel *result = [[SocketModel alloc] initWithDictionary:notification.object error:nil];
    //NSLog(@"Result : %@", result);
    
    if ([result.messageType isEqualToIgnoreCase:MSG_TYPE_NODE_CONTENT]) {
        ContentModel *response = [[ContentModel alloc] initWithDictionary:notification.object error:nil];
        //NSLog(@"Response : %@", response);

        if ([_refDevice.deviceId isEqualToString:response.deviceId] && [_refDevice.nodeId isEqualToString:response.nodeId]) {
            [self requestDeviceDetail:@NO];
        }
    }
    if ([result.messageType isEqualToString:MSG_TYPE_NODE_PROFILE_UPDATE_RES]) {

        if (result.isSuccess) {
            [[JDFacade facade] alertTitle:@"장치 업데이트 완료" message:@"장치를 최신 버전으로 업데이트 하였습니다."];
        }
        else {
            [[JDFacade facade] confirmTitle:@"장치 업데이트 실패"
                                    message:@"오류가 발생하여 업데이트가 완료되지 않았습니다."
                                 btnOKLabel:@"재시도"
                             btnCancelLabel:@"취소"
                                  completion:^(CustomAlertView *alertView, NSInteger buttonIndex) {
                
                if (buttonIndex == 0) {
                    
                    [self btnUpdateTouched:nil];
                }
                
            }];
        }
    }
}

-(void)finishDeviveDelete {
    
    NSLog(@"tdvc finishDeviveDelete");
    
    [self btnCloseTouched:nil];
}


#pragma mark - MemoryWarning
- (void)releaseDeviceTimer {
    
    if (_deviceBackgroundTimer) {
        [_deviceBackgroundTimer invalidate];
        _deviceBackgroundTimer = nil;
    }
}

- (void)viewWillDisappear:(BOOL)animated {
    
    [self releaseDeviceTimer];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end