程序接收到的信号：EXC_BAD_ACCESS

Question

我在我的UITableViewController子类下面的方法：

-(void)populateDataStorage{ 

NSString *path = [[NSBundle mainBundle] pathForResource:@"FakeData" ofType:@"plist"]; 

if(path){ 
    NSArray *plistData = [[NSArray alloc] initWithContentsOfFile:path]; 
    NSEnumerator *enumerator = [plistData objectEnumerator]; 

    NSArray *personResults; 

    Photo *photo; 
    Person *person; 

    id currItem = [enumerator nextObject]; 

    while (currItem != nil) { 
     photo = (Photo *)[NSEntityDescription insertNewObjectForEntityForName:@"Photo" inManagedObjectContext: [[FlickrFetcher sharedInstance] managedObjectContext]]; 

     photo.name = [currItem objectForKey:@"name"]; 
     photo.path = [currItem objectForKey:@"path"]; 

     NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name = %@", [currItem objectForKey:@"user"]]; 

     personResults = [[FlickrFetcher sharedInstance] fetchManagedObjectsForEntity:@"Person" withPredicate:predicate]; 

     if ([personResults count] > 0) { 
      person = [personResults objectAtIndex:0]; 
     } 
     else { 
      person = (Person *)[NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:[[FlickrFetcher sharedInstance] managedObjectContext]]; 
      person.name = [currItem objectForKey:@"user"]; 
     } 

     photo.person = person; 
     [person addPhotosObject:photo]; 

     NSLog(@"Photo %@ added for user %@", photo.name, person.name); 

     currItem = [enumerator nextObject]; 
    } 

    [plistData release]; 
} 

}

而且我把它在我的应用程序didFinishLaunchingWithOptions方法在我的AppDelegate，方法也是相同AppDelegate，当它被调用时，我得到它在调试时出现的错误，如果我不调试这条线，它将运行该方法并加载没有问题。如果我根本不调试，它将不会调用该方法。

编辑：根据答案更改了代码问题仍然保持不变，如果我只是运行没有任何反应，但在调试时出现错误。当我调试整个方法时，不显示错误。

Answer 1

您致电NSLog正尝试访问person变量的name财产。但是，当你声明你的person变量时，你没有初始化它，所以它指向垃圾。你只在else子句中给它一个有效值，所以有时你的NSLog正在访问一个未初始化的对象。