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我有一个应用程序，我正在使用带有 tableview 的搜索栏。当在搜索栏中输入特定单词并单击搜索按钮时，与该特定关键字匹配的所有值都显示在 tableview 中。但是当我单击搜索栏时再次开始删除特定单词，然后我的应用程序崩溃。这是我用于搜索文本并在表格视图中显示的代码。

-(void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
    if ([searcharray count]>0)
    {
        canSelectRow = YES;
        self.tblView.scrollEnabled = YES;
    }else {
        canSelectRow = NO;
        self.tblView.scrollEnabled = NO;
    }
    isSearchOn = YES;
    searchBar.showsCancelButton = YES;
    [searchBar setShowsCancelButton:YES animated:YES];
    searchBar.autocorrectionType = UITextAutocorrectionTypeNo;

}



-(void)searchBar:(UISearchBar*)searchBar textDidChange:(NSString*)searchText 
{
    [searcharray removeAllObjects];

    if ([searchText length]>0) 
    {
        isSearchOn = YES;
        canSelectRow = YES;
        self.tblView.scrollEnabled = YES;
        [self searchTableView];
    }
    else {

        isSearchOn = NO;
        canSelectRow = NO;
        self.tblView.scrollEnabled = NO;
    }
    [self.tblView reloadData];

}

-(void)searchBarTextDidEndEditing:(UISearchBar *)searchBar
{
    searchBar.showsCancelButton = NO;

}


-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    searchBar.text = @"";
    testSearch = NO;
    canSelectRow = YES;
    self.tblView.scrollEnabled = YES;
    [searchBar resignFirstResponder];
    [self.tblView reloadData];
}


-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar1
{
    testSearch = TRUE;
    NSString *searchtext = searchBar.text;

    int tag =(NSNumber*) [[NSUserDefaults standardUserDefaults] integerForKey:@"buttontag"];
    if (tag==0)
    {
        //calling my api method to display on the tableview.    
    }
    else if(tag==1)
    {
        //calling my api method to display on the tableview.
    }
    else if(tag==2)
    {
        //calling my api method to display on the tableview.
    }
    else if(tag==3)
    {
        //calling my api method to display on the tableview.
    }
    else if(tag==4)
    {
        //calling my api method to display on the tableview.
    }
    else if(tag ==5)
    {
        //calling my api method to display on the tableview.
    }


    [searchBar resignFirstResponder];
}

在单元格中显示时，我正在使用 searcharray

tableview cellForRowAtIndexPath
{
//testSearch is the bool variable that i have returned true when search button is clicked
if (testSearch)
    {
        //through the search arrray i am displaying in cell.
        NSDictionary *dict = [searcharray objectAtIndex:indexPath.row];

// app is crashing at this point.
        ****cell.lblPassion.text = [dict objectForKey:@"Title"];****
        cell.lblCost.text = [dict objectForKey:@"DescriptionMobile"];

        NSString *startdate =[dict objectForKey:@"StartDtm"];
        NSDate *newstartdate = [dateformatter dateFromString:startdate];
        NSString *custommessage = (NSString*)[dict objectForKey:@"OfferCustomMessage"];
        if ( custommessage !=nil && custommessage !=NULL && custommessage !=(NSString*) [NSNull null]) {

            cell.lblCustomMsg.hidden = NO;
            cell.lblCustomMsg.text = custommessage;
            cell.lblDiscount.hidden = YES;
            cell.lblDeal.hidden = YES;
            cell.lblStrikeout.hidden = YES;
            cell.strikeimage.hidden = YES;

        }
}
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