Objective c 对象被释放到'；我不知道为什么？

请帮助我，我无法理解为什么会发生这种情况。没有任何原因，对象

\u getProductType

被释放。请看一看，我不知道发生了什么，如果你能帮助我，我会非常感谢你，提前谢谢

    //
    //  ProductComponentViewController.m
    //  TurfNutritionTool
    //
    //  Created by Aashish Joshi on 10/14/11.
    //  Copyright 2011 Abacus Consultancy Services. All rights reserved.
    //

    #import "ProductComponentViewController.h"
    #import <QuartzCore/QuartzCore.h>

    @implementation ProductComponentViewController

    @synthesize productTableView =      _productTableView;
    @synthesize productTypeSelector =   _productTypeSelector;
    @synthesize turftypePopover =       _turftypePopover;
    @synthesize gotTurftype =           _gotTurftype;
    @synthesize resultProduct =         _resultProduct;
    @synthesize productTableCellStyle = _productTableCellStyle;
    @synthesize dbObject =              _dbObject;
    @synthesize getProductType =        _getProductType;

    #define Granular @"G"
    #define Liquid @"L"
    #define Tankmix @"T"
    #define AllProduct @"A"

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
       {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            // Custom initialization
        }
        return self;
       }

         - (void)didReceiveMemoryWarning
         {
        // Releases the view if it doesn't have a superview.
        [super didReceiveMemoryWarning];

       // Release any cached data, images, etc that aren't in use.
       }

    #pragma mark - View lifecycle

       - (void)viewDidLoad
       {
        [super viewDidLoad];
        // D    o any additional setup after loading the view from its nib.

        UIColor *_background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"main_bg.png"]];
        self.view.backgroundColor = _background;
        [_background release];

        // init the segment button value 
        [productTypeSelector setSelectedSegmentIndex:0];

        _getProductType = [[NSString alloc] initWithString:AllProduct];

        // set table delegate
        _productTableView.delegate = self;

        // load the product
        [self loadProductComponentValues];

        // Set the table view to be rounded
        [[_productTableView layer] setCornerRadius:5.0];
    }

    - (void)viewDidUnload
    {
        [self setProductTableView:nil];
        [self setProductTypeSelector:nil];

        _productTableView = nil;
        _productTypeSelector = nil;
        _turftypePopover = nil;
        _gotTurftype = nil;
        _resultProduct = nil;
        _productTableCellStyle = nil;
        _getProductType = nil;

        [_getProductType release];
        [_productTableView release];
        [_productTypeSelector release];
        [_turftypePopover release];
        [_gotTurftype release];
        [_resultProduct release];
        [_productTableCellStyle release];

        [super viewDidUnload];
        // Release any retained subviews of the main view.
        // e.g. self.myOutlet = nil;
    }

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    {
        // Return YES for supported orientations
        return YES;
    }

    - (void)dealloc {

        [_getProductType release];
        [_productTableView release];
        [_productTypeSelector release];
        [_turftypePopover release];
        [_gotTurftype release];
        [_resultProduct release];
        [_productTableCellStyle release];    

        [super dealloc];
    }

    #pragma mark - Table view data source

    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
    {
        // #warning Potentially incomplete method implementation.
        // Return the number of sections.
        return 1;
    }

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
    {
        // #warning Incomplete method implementation.
    // Return the number of rows in the section.

    // NSLog(@"%s", __FUNCTION__);
    return [self.resultProduct count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        [[NSBundle mainBundle] loadNibNamed:@"productContentTableCellStyle" owner:self options:nil];
        cell = _productTableCellStyle;
        self.productTableCellStyle = nil;
    }


    NSDictionary * _productRow = [_dbObject getProductdetail:[self.resultProduct objectAtIndex:indexPath.row]];


    // Configure the cell...

    UILabel* _label = (UILabel *)[cell viewWithTag:1];
    NSString* _linkcode = [_productRow objectForKey:@"linkcode"];  
    _label.text = _linkcode;

    _label = (UILabel *)[cell viewWithTag:2];
    NSString* _description = [_productRow objectForKey:@"description"];
    _label.text = _description;

    _label = (UILabel *)[cell viewWithTag:3];
    NSString* _productcode = [_productRow objectForKey:@"productcode"];
    _label.text = _productcode;

    _label = (UILabel *)[cell viewWithTag:4];
    NSString* _weight = [_productRow objectForKey:@"weight"];
    _label.text = _weight;

    _label = (UILabel *)[cell viewWithTag:6];
     NSNumber* _costperBag = [[NSNumber alloc] initWithFloat:[[_dbObject getUserProductCost:[self.resultProduct objectAtIndex:indexPath.row]] floatValue]];
    _label.text = [@"$ " stringByAppendingString:[_costperBag stringValue]];
    [_costperBag autorelease];


    _getProductType = [_productRow objectForKey:@"producttype"];

    if ([_getProductType isEqualToString:@"G"]) {

        _label = (UILabel *)[cell viewWithTag:10];
        NSString* _weightTag = [[NSString alloc] initWithString:@"Weight in Lbs"];  
        _label.text = _weightTag;
        [_weightTag autorelease];

        _label = (UILabel *)[cell viewWithTag:11];
        NSString* _SGNTag = [[NSString alloc] initWithString:@"SGN"];  
        _label.text = _SGNTag;
        [_SGNTag autorelease];

        _label = (UILabel *)[cell viewWithTag:5];
        NSString* _sgn = [_productRow objectForKey:@"sgn"];
        _label.text = _sgn;

} else if([_getProductType isEqualToString:@"L"]) {

        _label = (UILabel *)[cell viewWithTag:10];
        NSString* _weightTag = [[NSString alloc] initWithString:@"Weight in Ozs"];  
        _label.text = _weightTag;
        [_weightTag autorelease];

        _label = (UILabel *)[cell viewWithTag:11];
        NSString* _SGTag = [[NSString alloc] initWithString:@"SG"];
        _label.text = _SGTag;
        [_SGTag autorelease];


        _label = (UILabel *)[cell viewWithTag:5];
        NSString* _sgn = [_productRow objectForKey:@"sg"];
        _label.text = _sgn;

    } else if([_getProductType isEqualToString:@"T"]) {

         _label = (UILabel *)[cell viewWithTag:10];
         NSString* _weightTag = [[NSString alloc] initWithString:@"Weight in Ozs"];  
        _label.text = _weightTag;
        [_weightTag autorelease];

        _label = (UILabel *)[cell viewWithTag:11];
         NSString* _SGTag = [[NSString alloc] initWithString:@"SG"];
        _label.text = _SGTag;
        [_SGTag autorelease];    

        _label = (UILabel *)[cell viewWithTag:5];
        NSString* _sgn = [_productRow objectForKey:@"sg "];
        _label.text = _sgn;
    }
    return cell;
}

- (UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section { 

    UIColor *_background = [[[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"toolbar_bkg.png"]] autorelease];
    UIView* _customView = [[[UIView alloc]initWithFrame:CGRectMake(10.0, 0.0, 300.0, 44.0)]autorelease];
    _customView.backgroundColor = _background;
    return _customView; 
}

- (UIView *) tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section { 

    UIColor *_background = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"toolbar_bkg.png"]];
    UIView* _customView = [[[UIView alloc]initWithFrame:CGRectMake(10.0, 0.0, 300.0, 44.0)]autorelease];
    _customView.backgroundColor = _background;
    [_background release];
    return _customView ;    
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];

    if (_delegate != nil) {
        NSString *_selectedTurftype = [_getTurftype objectAtIndex:indexPath.row];
        [_delegate getSelectedTurftype:_selectedTurftype];
    }
     */
    // NSDictionary * _productRow = [_dbObject getProductdetail:[self.resultProduct objectAtIndex:indexPath.row]];

    // Animate the deselection
    [self.productTableView deselectRowAtIndexPath:[self.productTableView indexPathForSelectedRow] animated:YES];

    CGRect _popoverRect = CGRectMake(800.0f, 380.0f, 10.0f, 10.0f);

    if ([_turftypePopover isPopoverVisible]) {
        [_turftypePopover dismissPopoverAnimated:YES];
    }
    else
    {
        ProductDetailViewController* _productDetailViewControllerObj = [[ProductDetailViewController alloc] init];
        _turftypePopover = [[UIPopoverController alloc]
                            initWithContentViewController:_productDetailViewControllerObj];
        _productDetailViewControllerObj.dbObject = _dbObject;

        [_productDetailViewControllerObj getSelectedProductId:[self.resultProduct objectAtIndex:indexPath.row] ];
        [_productDetailViewControllerObj release];
        _turftypePopover.popoverContentSize = CGSizeMake(360, 500);
        [_turftypePopover presentPopoverFromRect:_popoverRect inView:self.view 
                        permittedArrowDirections:0 animated:YES];
    }

    [self.productTableView deselectRowAtIndexPath:[self.productTableView indexPathForSelectedRow] animated:YES];
}

#pragma mark - ProductComponentViewController lifecycle methods

- (IBAction)laodTurftype:(id)sender {

    [self initAllTheProduct];

    if (_getProductType == (id)[NSNull null] && _getProductType == nil) {

        _getProductType = [NSString stringWithString:AllProduct];
    }

    if ([_turftypePopover isPopoverVisible]) {
        [_turftypePopover dismissPopoverAnimated:YES];
    }
    else
    {
        TurftypePopoverViewController* _turftypeControllerObj = [[TurftypePopoverViewController alloc] init];

        _turftypeControllerObj.dbObject = _dbObject;

        _turftypeControllerObj.delegate = self;

        _turftypePopover = [[UIPopoverController alloc]
                            initWithContentViewController:_turftypeControllerObj];
        [_turftypeControllerObj release];

        _turftypePopover.popoverContentSize = CGSizeMake(150, 225);
        [_turftypePopover presentPopoverFromBarButtonItem:sender
                                 permittedArrowDirections:UIPopoverArrowDirectionAny
                                                 animated:YES];
    }
}

- (IBAction)setProductType:(id)sender {

     switch (_productTypeSelector.selectedSegmentIndex) {
         case 0:
             _getProductType =  [NSString stringWithString:AllProduct];
             break;
         case 1:
             _getProductType = [NSString stringWithString:Granular];
             break;   
         case 2:
             _getProductType = [NSString stringWithString:Liquid];
             break; 
         case 3:
             _getProductType = [NSString stringWithString:Tankmix];
             break; 
     }

    [self loadProductComponentValues];
    // Check Point
    [TestFlight passCheckpoint:@"SET_PRODUCT_TYPE"];
}

// This is Delgate Method to get selceted product
-(void) getSelectedTurftype:(NSString*) getTurftype {

    self.gotTurftype = getTurftype;
    NSLog(@"self.gotTurftype %@", self.gotTurftype);
    [self loadProductComponentValues];

    if ([_turftypePopover isPopoverVisible]) {
        [_turftypePopover dismissPopoverAnimated:YES];
    }
}

-(void) initAllTheProduct {

    _getProductType = [NSString stringWithString:AllProduct];
    self.gotTurftype = nil;

    // init the segment button value 
    [productTypeSelector setSelectedSegmentIndex:0];
    [self loadProductComponentValues];
    // Check Point
    [TestFlight passCheckpoint:@"SET_ALL_PRODUCT"];
}

- (IBAction)setAllProduct:(id)sender {

    [self initAllTheProduct];
}

// This Method use for Load Value of ProductComponent
- (NSMutableArray*) loadProductComponentValues {

    [self.resultProduct removeAllObjects]; 
    if (!_dbObject) [self loadDBAccessDatabase];

    self.resultProduct = [[NSMutableArray alloc] initWithArray:[self.dbObject getRelatedProductArray:self.gotTurftype andProductType:_getProductType]];
    [_productTableView reloadData];
    return self.resultProduct;
}

- (NSMutableArray *) loadProductComponentValuesIfEmpty {
    // NSLog(@"%s", __FUNCTION__);

    [self initAllTheProduct];
    if (!_dbObject) [self loadDBAccessDatabase];
    if (!self.resultProduct || ![self.resultProduct count]) self.resultProduct = [[NSMutableArray alloc] initWithArray:[self.dbObject getRelatedProductArray:self.gotTurftype andProductType:_getProductType]];
    // Check Point
    [TestFlight passCheckpoint:@"LOAD_DATABASE"];

    return self.resultProduct;
}

- (DBAccess *) loadDBAccessDatabase {
    // NSLog(@"%s", __FUNCTION__);
    if (!_dbObject) {

        NSString * _dbFileName = @"turfnutritiontool.db";
        _dbObject = [[DBAccess alloc] initWithSSDBAccessFilename:_dbFileName];
    }
    return _dbObject;
}

@end

//
//ProductComponentViewController.m
//草皮醇
//
//2011年10月14日由Aashish Joshi创建。
//版权所有2011 Abacus咨询服务。版权所有。
//
#导入“ProductComponentViewController.h”
#进口
@ProductComponentViewController的实现
@综合productTableView=\u productTableView；
@合成productTypeSelector=\u productTypeSelector；
@合成TurbtypePopover=\u TurbtypePopover；
@合成gottruptype=_gottruptype；
@合成resultProduct=\u resultProduct；
@合成productTableCellStyle=\u productTableCellStyle；
@合成dbObject=_dbObject；
@合成getProductType=\u getProductType；
#定义粒度@“G”
#定义液体@“L”
#定义Tankmix@“T”
#定义所有产品@“A”
-（id）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil
{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
//自定义初始化
}
回归自我；
}
-（无效）未收到记忆警告
{
//如果视图没有superview，则释放该视图。
[超级记忆警告]；
//释放所有未使用的缓存数据、图像等。
}
#pragma标记-视图生命周期
-（无效）viewDidLoad
{
[超级视图下载]；
//D o从nib加载视图后的任何附加设置。
UIColor*_background=[[UIColor alloc]initWithPatternImage:[UIImage IMAGENAME:@“main_bg.png”]；
self.view.backgroundColor=\u background；
[_后台发布]；
//初始化段按钮值
[productTypeSelector setSelectedSegmentIndex:0]；
_getProductType=[[NSString alloc]initWithString:AllProduct]；
//集合表委托
_productTableView.delegate=self；
//装载产品
[self-loadProductComponentValues]；
//将表格视图设置为四舍五入
[[U productTableView图层]设置角半径：5.0]；
}
-（无效）视图卸载
{
[self-setProductTableView:无]；
[self-setProductTypeSelector:nil]；
_productTableView=nil；
_productTypeSelector=nil；
_purptypepover=nil；
_类型=零；
_结果产品=无；
_productTableCellStyle=nil；
_getProductType=nil；
[[u getProductType发布]；
[_productTableView发布]；
[_productTypeSelector发布]；
[_-poppover-release]；
[_类型发布]；
[_结果产品发布]；
[_productTableCellStyle发布版]；
[超级视频下载]；
//释放主视图的所有保留子视图。
//例如，self.myOutlet=nil；
}
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation
{
//对于支持的方向返回YES
返回YES；
}
-（无效）解除锁定{
[[u getProductType发布]；
[_productTableView发布]；
[_productTypeSelector发布]；
[_-poppover-release]；
[_类型发布]；
[_结果产品发布]；
[_productTableCellStyle发布版]；
[super dealoc]；
}
#pragma标记-表视图数据源
-（NSInteger）表格视图中的节数：（UITableView*）表格视图
{
//#警告可能不完整的方法实现。
//返回节数。
返回1；
}
-（NSInteger）表视图：（UITableView*）表视图行数节：（NSInteger）节
{
//#警告方法执行不完整。
//返回节中的行数。
//NSLog（@“%s”，函数）；
返回[self.resultProduct count]；
}
-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath
{
静态NSString*CellIdentifier=@“Cell”；
UITableViewCell*单元格=[tableView dequeueReusableCellWithIdentifier:CellIdentifier]；
如果（单元格==nil）{
[[NSBundle mainBundle]loadNibNamed:@“productContentTableCellStyle”所有者：自选项：nil]；
单元格=_productTableCellStyle；
self.productTableCellStyle=nil；
}
NSDictionary*\u productRow=[\u dbObject getProductdetail:[self.resultProduct objectAtIndex:indexPath.row]]；
//配置单元格。。。
UILabel*_label=（UILabel*）[带标记的单元格视图：1]；
NSString*_linkcode=[_productRowobjectforkey:@“linkcode”]；
_label.text=\u linkcode；
_标签=（UILabel*）[带标签的单元格视图：2]；
NSString*_description=[_productRowobjectforkey:@“description”]；
_label.text=_说明；
_标签=（UILabel*）[带标签的单元格视图：3]；
NSString*_productcode=[_productrowobjectforkey:@“productcode”]；
_label.text=\u产品代码；
_标签=（UILabel*）[带标签的单元格视图：4]；
NSString*_weight=[_productRowobjectforkey:@“weight”]；
_label.text=_权重；
_标签=（UILabel*）[带标签的单元格视图：6]；
NSNumber*.\U costperBag=[[NSNumber alloc]initWithFloat:[[U dbObject getUserProductCost:[self.resultProduct objectAtIndex:indexPath.row]]floatValue]]；
_label.text=[@“$”stringByAppendingString:[[u costperBag stringValue]]；
[_costperBag自动释放]；
_getProductType=[\u productRow objectForKey:@“producttype”]；
if（[\u getProductType IsequalString:@“G”]）{
_标签=（UILabel*）[带标签的单元格视图：10]；
NSString*_weightTag=[[NSString alloc]initWithString:@“以磅为单位的重量”；
    [_getProductType release];
    [_productTableView release];
    [_productTypeSelector release];
    [_turftypePopover release];
    [_gotTurftype release];
    [_resultProduct release];
    [_productTableCellStyle release];

   _productTableView = nil;
    _productTypeSelector = nil;
    _turftypePopover = nil;
    _gotTurftype = nil;
    _resultProduct = nil;
    _productTableCellStyle = nil;
    _getProductType = nil;

_getProductType = [[NSString alloc] initWithString:AllProduct];

_getProductType = [[[NSString alloc] initWithString:AllProduct] retain];

 _getProductType =  [NSString stringWithString:AllProduct];

// First let's rename your property. In the .h file, modify the current declaration like so:
@property (nonatomic, copy) NSString *productType;

// In the .m file, change the @synthesize statement:
@synthesize productType = _productType;

// In cleaning up any compiler errors/warnings from references to the old names,
// modify code that directly assigns to the instance variable (other than in `dealloc`):

// So change this:
_getProductType =  [NSString stringWithString:AllProduct];

// to the following:
self.productType = [NSString stringWithString:AllProduct];

// ...or better yet:
self.productType = AllProduct;

// Note that the above statement is equivalent to the following:
[self setProductType:AllProduct];