ios - 用 NSObject 替换 NSMutableArray 并在 UITableView 中读取它

Question

我正在努力做到这一点，以便当我在 picherWheel 上选择船主时，我会在 tableView 中显示他们的船。目前，我正在通过在选择器上提供带有 if-else 系列的 NSMutableArray 来做到这一点，就像这样

-(void)updatePicker
{
NSString *boatsFromOwner = [boatOwners objectAtIndex:[shipOwners selectedRowInComponent:0]];

boatsForOwner = [[NSMutableArray alloc] init];
if ([boatsFromOwner isEqualToString:@"Owner1"]) {
    [self.boatsForOwner addObject:@"Titanic1"];
    [self.boatsForOwner addObject:@"Titanic2"];
    [self.boatsForOwner addObject:@"Titanic3"];
    [self.boatsForOwner addObject:@"Titanic4"];
    [self.boatsForOwner addObject:@"Titanic5"];
    [self.boatsForOwner addObject:@"Titanic6"];
    [self.boatsForOwner addObject:@"Titanic7"];
    }
if ([boatsFromOwner isEqualToString:@"Owner2"]) {
    [self.boatsForOwner addObject:@"Titanic1"];
    [self.boatsForOwner addObject:@"Titanic2"];
    [self.boatsForOwner addObject:@"Titanic3"];


    }

然后像这样将其读入 tableView:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [boatsForOwner count];
}

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

SimpleTableCell *cell = (SimpleTableCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];   


cell.nameLabel.text = [boatsForOwner objectAtIndex:indexPath.row];
cell.moreInfoLabel.text = [boatsForOwner objectAtIndex:indexPath.row];

return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
UITableViewCell *cell = [self.boatsTableView cellForRowAtIndexPath:indexPath];

[self performSegueWithIdentifier:@"boatInfoSegue" sender:cell];


[tableView deselectRowAtIndexPath:indexPath animated:YES];

现在，一切正常。但我认为使用 NSObjects 来存储有关船只的信息会很聪明，因为我将在多个地方需要它。所以我做了一些船对象，像这样:

cargoShips* Titanic = [[cargoShips alloc]init];
Titanic.name = @"Titanic1";
Titanic.size = @"1000";
Titanic.owner = @"Owner1";
cargoShips* Titanic2 = [[cargoShips alloc]init];
Titanic2.name = @"Titanic2";
Titanic2.size = @"2000";
Titanic2.owner = @"Owner2";

这会正确记录并且效果很好。这是第一个问题:

1) 我如何将 pickerWheel 上的对象链接到 *.owner，所以当我在轮子上选择“Owner1”时，我得到所有标记有 *.owner = 的船@"Owner1"?

2) 如何使用这些船的 *.name 填充 UITableView？

3) 当表中加载了这些对象时，我如何向目标 View 发送有关发送对象的消息？

提前致谢

Answer 1

它非常简单和直接。只需使用您创建的 CargoShips 类的对象。并按此方式操作。

-(void)updatePicker
{
NSString *boatsFromOwner = [boatOwners objectAtIndex:[shipOwners selectedRowInComponent:0]];

boatsForOwner = [[NSMutableArray alloc] init];
if ([boatsFromOwner isEqualToString:@"Owner1"]) {
  cargoShips* Titanic = [[cargoShips alloc]init];
  Titanic.name = @"Titanic1";
  Titanic.size = @"1000";
  Titanic.owner = @"Owner1";

  [self.boatsForOwner addObject:Titanic];

  Titanic = [[cargoShips alloc]init];
  Titanic.name = @"Titanic2";
  Titanic.size = @"2000";
  Titanic.owner = @"Owner2";

  [self.boatsForOwner addObject:Titanic];

  Titanic = [[cargoShips alloc]init];
  Titanic.name = @"Titanic3";
  Titanic.size = @"3000";
  Titanic.owner = @"Owner3";

  [self.boatsForOwner addObject:Titanic];

}else if ([boatsFromOwner isEqualToString:@"Owner2"]) {
  cargoShips* Titanic = [[cargoShips alloc]init];
  Titanic.name = @"Titanic1";
  Titanic.size = @"1000";
  Titanic.owner = @"Owner1";

  [self.boatsForOwner addObject:Titanic];

  Titanic = [[cargoShips alloc]init];
  Titanic.name = @"Titanic2";
  Titanic.size = @"2000";
  Titanic.owner = @"Owner2";

  [self.boatsForOwner addObject:Titanic];

}

}

在 TableView 委托(delegate)函数中，您可以使用以下代码

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

SimpleTableCell *cell = (SimpleTableCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];   

cargoShips* Titanic=[boatsForOwner objectAtIndex:indexPath.row];//You can get the object reference like this 
cell.nameLabel.text = Titanic.name;
cell.moreInfoLabel.text = Titanic.owner;

return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{

cargoShips* Titanic=[boatsForOwner objectAtIndex:indexPath.row]; //Use the Titanic object for further processing..
UITableViewCell *cell = [self.boatsTableView cellForRowAtIndexPath:indexPath];

[self performSegueWithIdentifier:@"boatInfoSegue" sender:cell];


[tableView deselectRowAtIndexPath:indexPath animated:YES];
}