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XCODE 4.3.2 版。这让我头疼不已，试图弄清楚如何做本教程。我已经对照他们的代码检查了代码，它看起来是正确的。我下载了别人的副本，它可以工作，但是我的副本完成并且取消不起作用。AddSightingViewController.m 代码如下所示

#import "AddSightingViewController.h"
@implementation AddSightingViewController

...
- (IBAction)cancel:(id)sender {
    [[self delegate] addSightingViewControllerDidCancel:self];
}
- (IBAction)done:(id)sender {
    [[self delegate] addSightingViewControllerDidFinish:self name:self.birdNameInput.text location:self.locationInput.text];
}
...

并且这些行上的调试检查点工作正常但是在 BirdsMasterViewController.m 我有以下代码：

#import "BirdsMasterViewController.h"
#import "BirdsDetailViewController.h"
#import "BirdSightingDataController.h"
#import "BirdSighting.h"
#import "AddSightingViewController.h"
@interface BirdsMasterViewController () <AddSightingViewControllerDelegate>
@end
@implementation BirdsMasterViewController
@synthesize dataController = _dataController;

...

- (void)addSightingViewControllerDidCancel:(AddSightingViewController *)controller {
    [self dismissViewControllerAnimated:YES completion:NULL];
}

- (void)addSightingViewControllerDidFinish:(AddSightingViewController *)controller name:(NSString *)name location:(NSString *)location {
    if ([name length] || [location length]) {
        [self.dataController addBirdSightingWithName:name location:location];
        [[self tableView] reloadData];
    }
    [self dismissModalViewControllerAnimated:YES];
}


...

这些行上的调试检查点永远不会停止我的代码上的程序（但会在下载的代码上停止）。我到底想念什么才能让它发挥作用。

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