Objective-C、iOS SDK、NSMutableArray、添加元素并保存数据
基本上,每次我在文本字段中输入内容并将其保存到表中时,前一个条目都会被新条目替换。如何在可变数组中添加元素并保存最后一个条目?我
[tabledata addObject....
在条目中
tabledata.lastObject objectAtIndex...
尝试过,但没有成功。
这是我所拥有的:
-(void)viewDidLoad
{
[super viewDidLoad];
titlestring = [[NSUserDefaults standardUserDefaults] objectForKey:@"titlehomework" ];
detailsstring = [[NSUserDefaults standardUserDefaults] objectForKey:@"detailshomework"];
tabledata = [[NSMutableArray alloc] initWithObjects:titlestring, nil];
tablesubtitles = [[NSMutableArray alloc] initWithObjects:detailsstring, nil];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
return [tabledata count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:@"homeworkcell"];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"homeworkcell"];
}
cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [tablesubtitles objectAtIndex:indexPath.row];
cell.textLabel.font = [UIFont systemFontOfSize:14.0];
cell.textLabel.backgroundColor = [ UIColor clearColor ];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
//-----------------------------------------START----------------------------Set image of cell----
cellImage = [UIImage imageNamed:@"checkboxblank.png"];
cell.imageView.image = cellImage;
//--------------------------------------------END---------------------------end set image of cell--
return cell;
}
Basically, every time I enter something in my textfield and save it to the table, the previous entry will be replaced by the new one. How do I add elements in a mutable array and save the last entry? I tried
[tabledata addObject....
and in the entry
tabledata.lastObject objectAtIndex...
but that didn't work.
here is what I have:
-(void)viewDidLoad
{
[super viewDidLoad];
titlestring = [[NSUserDefaults standardUserDefaults] objectForKey:@"titlehomework" ];
detailsstring = [[NSUserDefaults standardUserDefaults] objectForKey:@"detailshomework"];
tabledata = [[NSMutableArray alloc] initWithObjects:titlestring, nil];
tablesubtitles = [[NSMutableArray alloc] initWithObjects:detailsstring, nil];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
{
return [tabledata count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:@"homeworkcell"];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"homeworkcell"];
}
cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [tablesubtitles objectAtIndex:indexPath.row];
cell.textLabel.font = [UIFont systemFontOfSize:14.0];
cell.textLabel.backgroundColor = [ UIColor clearColor ];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
//-----------------------------------------START----------------------------Set image of cell----
cellImage = [UIImage imageNamed:@"checkboxblank.png"];
cell.imageView.image = cellImage;
//--------------------------------------------END---------------------------end set image of cell--
return cell;
}
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在没有看到更多代码的情况下,我能做的最好的就是建议这样的内容
这假设
newTitle
和newSubtitle
都是您想要添加的NSString
tableView
是指向UITableView
的指针。Without seeing more code, the best I can do is suggest something like this
This assumes both
newTitle
andnewSubtitle
are theNSString
s you wish to add and thattableView
is the pointer to theUITableView
.