来自另一个 UIVIewController 的 selectRowAtIndexPath 不起作用

问题描述

我正在尝试在 UITableView 上调用 selectRowAtIndexPath，该 UITableView 是我从中调用它的 UIViewController 的子视图.

I am trying to call selectRowAtIndexPath on a UITableView that is a subview to the UIViewController I am calling it from.

我已经设置好了，当你选择一个单元格时它会变灰，这很好，但是我正在加载不同的数据集进出 UITableView，每当做出选择时，我都会将所选的 NSIndexPath 发送回UIViewController.然后，当接下来为 NSIndexPath 加载正确的数据集时，我会从 UIViewController 调用此方法.

I have set it up so that when you select a cell it goes grey and thats fine, however I am loading different data sets in and out of the UITableView and when ever a selection is made I am sending that selected NSIndexPath back to the UIViewController. Then when the view is next loaded with the correct data set for the NSIndexPath I call this method from my UIViewController.

if (codeIndexPath != nil) {
            [filterViewController.tableView selectRowAtIndexPath:codeIndexPath animated:NO scrollPosition:UITableViewScrollPositionMiddle];
}

然后在 UITableView 类中，我的 cellForRowAtIndexPath 和 didSelectRowAtIndexPath 看起来像这样.

Then in the UITableView class my cellForRowAtIndexPath and didSelectRowAtIndexPath look like this.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    // Configure the cell...
    NSString *projectDescriptionString = [currentFilterMutableArray objectAtIndex:indexPath.row];
    cell.textLabel.text = projectDescriptionString;
    if (indexPath == currentlySelectedIndex) {
        cell.highlighted = YES;
    } else if (indexPath == currentlySelectedIndex) {
        cell.highlighted = NO;
    }
    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    cell.selectionStyle = UITableViewCellSelectionStyleGray;

    // send this data back in the delegate so you can use it to show where the tick is again if you need too.
    currentlySelectedIndex = indexPath;

    [[self delegate] updateInstallTableWithFilter:[currentFilterMutableArray objectAtIndex:indexPath.row] FilterType:filterType InstallIndex:indexPath];

}

当它加载到屏幕上时，正确的单元格会高亮显示一秒钟，然后变回白色.

When It loads on the screen the correct cell will highlight for a second then go back to white.

cellForRowAtIndexPath 中的新 if 语句

New if statment inside cellForRowAtIndexPath

if ([indexPath isEqual:currentlySelectedIndex]) {
        cell.highlighted = YES;
    } else if (![indexPath isEqual:currentlySelectedIndex]) {
        cell.highlighted = NO;
    }

我仍然收到同样的错误.

I am still receiving the same error.

推荐答案

UITableViewController 有一个名为 clearsSelectionOnViewWillAppear 的属性.来自文档:

UITableViewController has a property called clearsSelectionOnViewWillAppear. From the doc:

当table view第一次被加载时，表视图控制器重新加载表视图的数据.它也清除它的选择(有或没有动画，取决于请求)每次显示表格视图时.UITableViewController类在超类方法 viewWillAppear: 中实现了这一点.你可以通过更改中的值来禁用此行为clearsSelectionOnViewWillAppear 属性.

所以在那个表视图控制器子类中，在 viewDidLoad...

So in that table view controller subclass, in viewDidLoad...

- (void)viewDidLoad {
    [super viewDidLoad];
    self.clearsSelectionOnViewWillAppear = NO;
}

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