UITableView在返回时不会保留行 [英] UITableView doesn't keep row selected upon return

问题描述

我的应用中有几个表格视图。我熟悉表格的通常行为，当你选择一行并进入推动视图时，它会变为蓝色，然后当你返回时它会保持蓝色一瞬间然后渐变为白色，以便通知用户刚刚选择了什么行。

i have several table views in my app. I am familiar with the usual behaviour of tables, that when you select a row and progress to a pushed view, it turnes blue, then when you go back it stays blue for a split second then fades to white, in order to notify the user of what row was just selected.

直到最近我才注意到它不再是我所描述的最后一点：它没有保持蓝色分裂第二...

This worked perfectly up until recently when i noticed it no longer did the last bit of what I described: it didn't stay blue for that split second...

我不知道为什么，但在阅读了这个网站上的一些相关帖子后，我意识到那个被调用的代码片段是在viewDidAppear方法中。令我困惑的是我没有覆盖这个方法，但是我确实用NSLog测试了它，以显示它应该取消选择的行的索引路径，返回（null）。

I have no idea why, but after reading a few related posts on this site i realised that the piece of code that does that gets called is in the "viewDidAppear" method. What confuses me is that I don't override this method, but i did test it with an NSLog to show me the index path for the row it should deselect, which returned (null).

所以这让我相信，不知怎的，tableView过早地取消了行。

So this is leading me to believe that somehow, the tableView is prematurely deselecting the row.

下面是我的didSelectRowForIndexPath方法：

Below is my didSelectRowForIndexPath method:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"Selected row at index path: %@", indexPath);

    //setting our view controller as what we want
    TripDetails *detailViewController = [[TripDetails alloc] initWithNibName:@"TripDetails" bundle:nil];
    self.tripsDetailViewController = detailViewController;
    [detailViewController release];


 // Pass the selected object to the new view controller.
    NSLog(@"Passing trip...");
    self.tripsDetailViewController.selectedTrip =  [fetchedResultsController objectAtIndexPath:indexPath];

    //Hide the bottom bar on pushed view
    tripsDetailViewController.hidesBottomBarWhenPushed = YES;

   [self.navigationController pushViewController:tripsDetailViewController animated:YES];

}

非常感谢任何帮助，谢谢：）

Any help is greatly appreciated, thanks :)

编辑：已修复

我得到了它的工作......似乎我在viewWillAppear方法中调用[self.tableView reloadData]方法，然后导致表取消选择所有单元格。下面是我修改过的viewDidLoad方法。感谢您的建议！

I got it working.... Seems i was calling the [self.tableView reloadData] method in my viewWillAppear method which then caused the table to deselect all cells. Below is my modified viewDidLoad method. Thanks for the suggestions!

- (void)viewWillAppear:(BOOL)animated 
{
NSLog(@"running viewWIllAppear for TripsTable");

//Getting indexpath for highlighened cell, to rehighlight
NSIndexPath *selectedIndex = [self.tableView indexPathForSelectedRow];

//Refreshing Table - Implement an if statement on the condition that the data has     changed
[self viewDidLoad];
[self.tableView reloadData];

//Re select cell
[self.tableView selectRowAtIndexPath:selectedIndex animated:NO scrollPosition:UITableViewScrollPositionNone];


[super viewWillAppear:animated];
 }

推荐答案

它可以转一个功能关闭。

Its a feature you can turn off.

在UITableViewController中你可以调用

In the UITableViewController you can call

[ self setClearsSelectionOnViewWillAppear:NO ];

这直接来自文件UITableViewController.h。此功能记录在那里。

This is directly from the file "UITableViewController.h". This feature is documented there.

   @property(nonatomic) BOOL clearsSelectionOnViewWillAppear __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_3_2); 
// defaults to YES. If YES, any selection is cleared in viewWillAppear:

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