无法将单元格从 Modal VC 添加到 UITableView 到 Table VC（复杂）

Question

我正在尝试从模态视图控制器向我的表格视图控制器添加一个单元格。我的数据源数组有多个属性（名称、时间间隔）。现在我的模态视图控制器中有一个委托/协议，它将数据发送到表视图控制器。但是，由于某种原因，我可以将数据添加到数组中，但我无法使用该数据将单元格添加到 tableview 中。这是我的代码：

ToDoTableViewController.h (TableViewController)

 @interface ToDoTableViewController : UITableViewController <UITableViewDataSource, Properties2ViewControllerDelegate>
{
IBOutlet UIView *headerView;
}
@property (strong, nonatomic) NSMutableArray *taskArray;
-(UIView *)headerView;
-(IBAction)addCell:(id)sender;

ToDoTableViewController.m (TableViewController)

-(void) viewDidLoad{
    [[self tableView] setDataSource:self];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];
    if (!cell)
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"UITableViewCell"];
[[cell textLabel] setText:[taskArray objectAtIndex:[indexPath row]]];
    return cell;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return [taskArray count];
}
-(IBAction)addCell:(id)sender{
    Properties2ViewController *pvc = [[Properties2ViewController alloc]init];
    [pvc setDelegate:self];
    [self presentViewController:pvc animated:YES completion:NULL];
}
-(UIView *)headerView{
    if (!headerView){
        [[NSBundle mainBundle] loadNibNamed:@"HeaderView" owner:self options:nil];        
    }
    return headerView;
}
-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    return [self headerView];
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    return [[self headerView] bounds].size.height;
}
-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [[self tableView] reloadData];
    }
-(void)properties2ViewControllerDidEnterPropertiesSuccesfully:(Tasks *)t{
    [taskArray addObject:t];
}

Properties2ViewController.h (ModalViewController)

    @class Tasks;
@protocol Properties2ViewControllerDelegate;

@interface Properties2ViewController : UIViewController <UITextFieldDelegate>{
__weak IBOutlet UITextField *taskName;
__weak IBOutlet UIButton *doneButton;
    __weak IBOutlet UIDatePicker *datePicker;
    __weak IBOutlet UILabel *label1;
    __weak IBOutlet UILabel *label2;
}
@property (strong, nonatomic) Tasks *testTask;
@property (weak, nonatomic) id <Properties2ViewControllerDelegate> delegate;
-(IBAction)dismiss:(id)sender;
-(IBAction)cancel:(id)sender;
@end

@protocol Properties2ViewControllerDelegate <NSObject>

@optional
-(void)properties2ViewControllerDidEnterPropertiesSuccesfully:(Tasks *)t;
@end

Properties2ViewController.m (ModalViewController)

-(IBAction)dismiss:(id)sender{
    testTask = [[Tasks alloc]initWith:[taskName text] :[datePicker countDownDuration] :[NSDate date]];
    if ([self.delegate respondsToSelector:@selector (properties2ViewControllerDidEnterPropertiesSuccesfully:)]){
        [self.delegate properties2ViewControllerDidEnterPropertiesSuccesfully:testTask];
    }
    [self dismissViewControllerAnimated:YES completion:NULL];
}
-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
}
-(BOOL) textFieldShouldReturn:(UITextField *)aTextField{
    if (aTextField.tag == 1){
        [taskName resignFirstResponder];
    }
    return YES;
}
-(void)viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];
}
-(IBAction)cancel:(id)sender{
    [self dismissViewControllerAnimated:YES completion:NULL];
}
@end

这是 Task 类的属性...如果有帮助的话...

@interface Tasks : NSObject
@property (strong, nonatomic) NSString *taskName;
@property NSTimeInterval timeInterval;
@property NSDate *dateCreated;

-(id)initWith:(NSString *)tskNme :(NSTimeInterval)timeInt :(NSDate *)dateCreat;
@end

---编辑----- 所以我试着把它放在我的 properties2ViewControllerDidEnterPropertiesSuccesfully 委托方法中，但仍然没有创建单元格......：

-(void)properties2ViewControllerDidEnterPropertiesSuccesfully:(Tasks *)t{
    [taskArray addObject:t];
    [self.tableView reloadData];
    int lastRow = [[self tableView] numberOfRowsInSection:0];
    NSIndexPath *ip = [NSIndexPath indexPathForItem:lastRow inSection:0];
    [self.tableView cellForRowAtIndexPath:ip];
}

另外，如果我切换

[self.tableView cellForRowAtIndexPath:ip];

与

[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:ip] withRowAnimation:UITableViewRowAnimationTop];

然后抛出异常（Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to insert row 0 into section 0, but there are only 0 rows in section 0 after the update'）

Answer 1

您可能想尝试 [tableView reloadData] in

- properties2ViewControllerDidEnterPropertiesSuccesfully

Answer 2

您最后得到的错误表明该条目永远不会进入数组。调用 [taskArray addObject:t]; 后可以检查数组的长度吗？ ?另外，检查对象 (t) 的值，看看是否真正传入了正确的 testTask。

看来您实际上并没有创建taskArray，只是声明它。尝试在您的 ToDoTableViewControllers viewDidLoad 中添加它

taskArray = [[NSMutableArray alloc] init];