SplitViewController 在 Xcode 4.2 中使用 NSNotifications 打开其他视图

Question

我正在尝试制作一个拆分视图控制器应用程序，并且正在按照食谱教程进行操作。但是本教程来自 Xcode 4.2 之前的版本，无法正常工作。我到处寻找 Xcode 4.2 和故事板的简单教程，但找不到任何东西。无论如何下面是我的代码和我的错误任何帮助将不胜感激！

错误：

2012-01-02 16:37:40.061 blackdahlia[2233:f803] -[DetailViewController recieveNotification]: unrecognized selector sent to instance 0x6c35650
2012-01-02 16:37:40.063 blackdahlia[2233:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[DetailViewController recieveNotification]: unrecognized selector sent to instance 0x6c35650'
*** First throw call stack:
(0x13be052 0x154fd0a 0x13bfced 0x1324f00 0x1324ce2 0x9c9a39 0x1389885 0x13897a8 0x90e1aa 0x91ab13 0x334b 0xa571d 0xa5952 0x92d86d 0x1392966 0x1392407 0x12f57c0 0x12f4db4 0x12f4ccb 0x12a7879 0x12a793e 0x15a9b 0x2688 0x25e5 0x1)
terminate called throwing an exception

MasterViewController.m

#import "MasterViewController.h"

#import "DetailViewController.h"

@implementation MasterViewController

@synthesize detailViewController = _detailViewController;
@synthesize anotherdetailViewController;
@synthesize recipeArray, recipe;


- (void)awakeFromNib
{
    self.clearsSelectionOnViewWillAppear = NO;
    self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
    [super awakeFromNib];

    recipeArray = [[NSMutableArray alloc] init];

    recipe = [[Recipe alloc] init];

    recipe.name = @"Sex on the Beach";
    recipe.instructions = @"Sexy Instructions";
    recipe.image = [UIImage imageNamed:@"testimage.jpg"];
    [recipeArray addObject:recipe];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

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

- (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];
    }

    recipe = [recipeArray objectAtIndex:indexPath.row];

    cell.textLabel.text = recipe.name;

    return cell;
}

- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    anotherdetailViewController.recipe = [recipeArray objectAtIndex:indexPath.row];
    [[NSNotificationCenter defaultCenter] postNotificationName:@"Test" object:self];
    NSLog(@"NOTIFICATION SENT");
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source.
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    } else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

@end

DetailViewController.m

#import "DetailViewController.h"

@interface DetailViewController ()
@property (strong, nonatomic) UIPopoverController *masterPopoverController;
- (void)configureView;
@end

@implementation DetailViewController

@synthesize detailItem = _detailItem;
@synthesize detailDescriptionLabel = _detailDescriptionLabel;
@synthesize masterPopoverController = _masterPopoverController;
@synthesize recipe, imageView;

#pragma mark - Managing the detail item

- (void)setDetailItem:(id)newDetailItem
{
    if (_detailItem != newDetailItem) {
        _detailItem = newDetailItem;

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

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

- (void)configureView
{
    // Update the user interface for the detail item.

    if (self.detailItem) {
        self.detailDescriptionLabel.text = [self.detailItem description];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recieveNotification) name:@"Test" object:nil];
}

- (void)recieveNotification:(NSNotification *) notification{

    if ([[notification name] isEqualToString:@"Test"]) {
        self.navigationItem.title = recipe.name;
        [self.imageView setImage:recipe.image];
        NSLog(@"Notification Recieved");
    }
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

#pragma mark - Split view

- (void)splitViewController:(UISplitViewController *)splitController willHideViewController:(UIViewController *)viewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)popoverController
{
    barButtonItem.title = NSLocalizedString(@"Master", @"Master");
    [self.navigationItem setLeftBarButtonItem:barButtonItem animated:YES];
    self.masterPopoverController = popoverController;
}

- (void)splitViewController:(UISplitViewController *)splitController willShowViewController:(UIViewController *)viewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
{
    // Called when the view is shown again in the split view, invalidating the button and popover controller.
    [self.navigationItem setLeftBarButtonItem:nil animated:YES];
    self.masterPopoverController = nil;
}

@end

Answer 1

您的-receiveNotification: 方法将NSNotification 作为参数，但您已将通知的选择器指定为-receiveNotification。

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recieveNotification) name:@"Test" object:nil];

注意没有冒号。这意味着通知实际上是在寻找带有签名的方法：- (void)receiveNotification 而不是- (void)receiveNotification:(NSNotification *)notification。