具有两个表视图的splitviewcontroller，委托问题 [英] Splitviewcontroller with two tableviews, delegate problem

问题描述

我有，这似乎是基本要求.我正在使用xcode 4的模板制作splitview iPad应用程序.我希望我的根视图控制器是一个填充有语言的表视图，而我的详细信息视图是另一个填充表，每次用户在左侧选择一种语言时都会重新填充.问题是，当用户在rootview中选择左侧的语言时，我的[tableView reloadData];在detailview中的功能不起作用，即. tableView委托不会被调用.我需要它，以便当用户选择一种语言时，tableView会刷新.

I have, what seems to be a basic requirment. I am making a splitview iPad app using xcode 4's template. I want my root view controller to be a table view populated with languages and my detail view to be another tableview that gets re-populated every time the user selects a language on the left. The problem is, when a user selects a language on the left in the rootview, my [tableView reloadData]; function in the detailview doesn't work ie. the tableView delegates do not get called. I need it so that when the user selects a language the tableView gets refreshed.

这是我现在拥有的代码: RootViewController.m

Here is the code I have now: RootViewController.m

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

DetailViewController *detObj = [[DetailViewController alloc] init];

detObj.detailItem = [self.tableArray objectAtIndex: indexPath.row];
NSLog(@"Selected Item %@", [self.tableArray objectAtIndex: indexPath.row]);

}

DetailViewController.m

DetailViewController.m

- (void)setDetailItem:(id)newDetailItem
{
NSLog(@"setDetailItem Called");
if (_detailItem != newDetailItem) {
    [_detailItem release];
    _detailItem = [newDetailItem retain];
    self.title = _detailItem; 
    NSLog(@"Detail Item %@", _detailItem);

    // Update the view.
    //[self testAction:self];
    [self configureView];
}

if (self.popoverController != nil) {
    [self.popoverController dismissPopoverAnimated:YES];
}       


}

- (void)configureView
{
// Update the user interface for the detail item.
[tableView setDataSource:self];
[tableView setDelegate:self];
NSLog(@"Configure");
[self.tableView reloadData];

}
#pragma mark - Split view support

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController: (UIPopoverController *)pc
{
barButtonItem.title = @"Languages";
NSMutableArray *items = [[self.toolbar items] mutableCopy];
[items insertObject:barButtonItem atIndex:0];
[self.toolbar setItems:items animated:YES];
[items release];
self.popoverController = pc;
}

// Called when the view is shown again in the split view, invalidating the button and popover controller.
- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
NSMutableArray *items = [[self.toolbar items] mutableCopy];
[items removeObjectAtIndex:0];
[self.toolbar setItems:items animated:YES];
[items release];
self.popoverController = nil;
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
NSLog(@"DETAIL numberOfSectionsInTableView Called");
#warning Potentially incomplete method implementation.
// Return the number of sections.
return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
// Return the number of rows in the section.
if(section == 0){
    return 2;
}
return 1;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {

if (section == 0) {
    return @"Documents";
}
else if (section == 1){
    return @"Video";
}
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return 100;

}

- (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] autorelease];
}

// Configure the cell...
cell.textLabel.text = @"Cell";

return cell;
}

通过所有这些日志正常工作的方式(tableView委托方法中的一个除外)，我在IB，.h和.m中都为这两个tableViews设置了委托.作为测试，我在带有IBAction的detailView nib文件中设置了一个按钮，如下所示:

By the way all those logs are working correctly (except for the one in the tableView delegate method) and I have set the delegates for both tableViews in IB, in the .h and in the .m. As a test I set up a button in the detailView nib file with an IBAction as follows:

- (void)testAction:(id)sender {
NSLog(@"Test CAlled");
[self.tableView reloadData];
}

，并且有效.发生了什么事?

and it works. What is going on?

推荐答案

在- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath中，您应该更新当前的DetailViewController而不是新建一个.使用分割视图时应遵循的方法. 因此，您应该替换alloc + init:

In - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath you should update current DetailViewController and not making new one. It is approach that you should follow when using split view. So you should replace alloc+init :

DetailViewController *detObj = [[DetailViewController alloc] init];

与

DetailViewController *detObj = self.currentDetailViewController;

其中self.currentDetailViewController应指向拆分视图中当前的左视图.

where self.currentDetailViewController should point on current left view in split view.

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