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我正在创建一种费用跟踪器类型的应用程序。

我的要求是在部分标题中获取日期，并在表格视图中获取该日期添加的费用。我尝试了以下代码，但它不起作用。

-(IBAction)bydate:(id)sender
{
[self.byDateArray removeAllObjects];
[self.byDateCountArray removeAllObjects];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateStyle:NSDateFormatterMediumStyle];
for(NSManagedObject *info in self.listOfExpenses){
    NSString *compareDates = [dateFormatter stringFromDate:[info valueForKey:@"date"]];
    BOOL isAvail = NO;
    for (int i = 0; i<[self.byDateArray count]; i++){
        if([compareDates isEqualToString:[self.byDateArray objectAtIndex:i]])
        {
            isAvail = YES;
        }
    }
    if(!isAvail)
        [self.byDateArray addObject:compareDates];
}
int count = 0;
for (int i = 0 ; i < [self.byDateArray count] ; i ++){
    NSString *compareDates = [self.byDateArray objectAtIndex:i];
    for(NSManagedObject *info in self.listOfExpenses){
        if([compareDates isEqualToString:[dateFormatter stringFromDate:[info valueForKey:@"date"]]])
        {
            count++;
        }
    }
    [self.byDateCountArray addObject:[NSNumber numberWithInt:count]];
    count = 0;
}
self.byDateTab.hidden = NO;
self.byDateTab.frame = CGRectMake(0, 123, 320, 244);
[self.view addSubview:self.byDateTab];
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
if(tableView == self.byDateTab)
    return [self.byDateArray count
 return 3;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int rows;
 if(tableView == self.byDateTab)
     rows = [[self.byDateCountArray objectAtIndex:section] intValue];
return rows;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

UITableViewCell *cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellIdentifier"]autorelease];
 if (tableView == self.byDateTab)
{
for(int i = 0; i < [self.byDateCountArray count];i++)
{
    if(indexPath.section == 0)
    {
        NSManagedObject *records = nil;
        records = [self.listOfExpenses objectAtIndex:indexPath.row];

        self.firstLabel.text = [records valueForKey:@"category"];
        self.secondLabel.text = [records valueForKey:@"details"];

        NSString *amountString = [NSString stringWithFormat:@"%@",[records valueForKey:@"amount"]];
        self.thirdLabel.text = amountString;
    }
    else if (indexPath.section == i)
    {
        int rowCount = 0;
        for(int j=0; j<indexPath.section; j++)
        {
            rowCount = rowCount + [[self.byDateCountArray objectAtIndex:j]intValue];
        }
        NSManagedObject *records = nil;
        records = [self.listOfExpenses objectAtIndex:(indexPath.row + rowCount) ];

        self.firstLabel.text = [records valueForKey:@"category"];
        self.secondLabel.text = [records valueForKey:@"details"];

        NSString *amountString = [NSString stringWithFormat:@"%@",[records valueForKey:@"amount"]];
        self.thirdLabel.text = amountString;
    }
}
}

但是我在这一行得到了 SIGABRT 错误

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [self.byDateArray objectAtIndex:section];
}

我在 NSlog 中收到以下错误

*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index 2 beyond bounds for empty array'
4

5 回答 5

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问题就在这里

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    if(tableView == self.byDateTab)
        return [self.byDateArray count];
     //why crashed at index 2,  because here is 3
     return 3;
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return [self.byDateArray objectAtIndex:section];
}

它在另一个不是“self.byDateTab”的表视图中崩溃

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    if(tableView == self.byDateTab)
    {
        return [self.byDateArray objectAtIndex:section];
    }
    else
    {
         //you should deal with other tableview
         // it crashed here
    }
}

或者只是禁用其他 tableview 的部分标题

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    if(tableView == self.byDateTab)
        return [self.byDateArray count];

    //i don't see other tableviews how to work, so if you do this, the code will work
    //then you should look back to the solution above
     return 0;
}
于 2012-05-25T07:53:52.817 回答
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根据错误您self.byDateArray在索引 2 处没有任何对象，因此请检查您的数组的内容。

于 2012-05-25T07:54:55.653 回答
0

你的byDateArray似乎是空的。

在做什么[self.byDateArray removeAllObjects];？

于 2012-05-25T07:55:57.340 回答
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如上所述，问题在于向您添加对象时self.byDateArray 可能self.byDateArray没有初始化？请在你的方法NSLog(@"self.byDateArray: %@",self.byDateArray)之前制作。[self.byDateArray removeAllObjects];-(IBAction)bydate:(id)sender

于 2012-05-25T08:02:46.243 回答
0

这意味着一个

section

值大于

self.byDateArray

数数。

尝试在第一行代码中添加：

NSLog(@" %@ ", self.byDateArray);

在 -(NSString *)tableView: 函数中查看数组的内容。

于 2012-05-25T08:06:34.340 回答