Question

I have a view controller MainVC which contains a view where I want to switch between various tables. I have an "abstract" class called InfoVC which extends UITableViewController and contains several methods that must be overridden or else they throw an exception. Finally, I have several classes which extend InfoVC and implement the "abstract" methods in InfoVC, along with methods that override tableView s numberOfRowsInSection and cellForRowAtIndexPath.

This is how I load a table in MainVC. In this case, TemperatureInfoVC extends InfoVC, self.subVC is of type InfoVC, and switchView is a view in MainVC:

TemperatureInfoVC *sVC = [[TemperatureInfoVC alloc] initWithStyle:UITableViewStylePlain];
self.subVC = sVC;
[sVC release];
[switchView insertSubview:self.subVC.view atIndex:0];

我的问题是,表格总是空洞的。从定点到点,我可以看到,“温度信息”栏号是“OfRowsIn”栏,但“温度信息”或“IndexPath”号都不叫。然而,如果我把上述法典的第一行改为:

InfoVC *sVC = [[InfoVC alloc] initWithStyle:UITableViewStylePlain];

然后,InfoVC的编号OfRowsInsection and cellForRowAtIndexPath被适当称为。是否有任何人知道为什么没有叫TyratureInfoVC的L.ForRowAtIndexPath?

Answer 1

Oops, 引出。我正在把位于NentVC的一架NSMutableArray中的数据装上中,但我正在把数据放在I初始化分VC之前,因此该表当然没有数据。

Answer 2

我假定,你没有指定代表(可调用的电文)和数据来源(可调用的电文)。通常,该代表和数据来源的实施都是按惯例使用可调用的电算盘,因此(如果IB没有接线),需要这样一些地方:

tableView.delegate = self;
tableView.dataSource = self;

often within the -loadView or -viewDidLoad:

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