Objective c NSMutableArray在调用后部分为空

我的视图控制器中有一个属性NSMutableArray

联系人VIEWCONTROLLER.h:

@interface ContactsViewController : UIViewController <UITableViewDelegate,      UITableViewDataSource>

@property (nonatomic,strong) NSMutableArray *contacts;
...
@end

这可能与[handle getContacts]中创建的对象的内存同时被清除有关。但我不知道如何解决这个问题。我尝试克隆或复制[handle get contacts]的输出，但没有成功。 要完成“getContacts”功能，请执行以下操作：

---

任何帮助都将不胜感激

另一种方法是将联系人信息放在字典中：

- (NSMutableArray*)getContacts {
    NSMutableArray *contacts = [[NSMutableArray alloc] init];

    NSManagedObjectContext *context = [self managedObjectContext];
    DBcontact *contact = [NSEntityDescription insertNewObjectForEntityForName:@"WhappContacts" inManagedObjectContext:context];
    // Test listing all FailedBankInfos from the store
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"WhappContacts" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSError *error;
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    for (contact in fetchedObjects) {
        NSDictionary *contactDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                contact.contactName, @"contactName", nil]; //add other necessary contact information

        [contacts addObject:contactDict];
        // Data seems fine here.
        NSLog(@"Name in: %@", contact.contactName);  
    }

    return contacts;
}

以及检索信息：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //NSLog(@"cell number %i",indexPath.row);
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {        
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Set up the cell...
    NSDictionary *dummycontact = [contacts objectAtIndex:indexPath.row];
    // Only part of the objects in the array contacts contain data!
    NSLog(@"Name cell: %@ %i", [dummycontact objectForKey:@"contactName"], indexPath.row);

    cell.textLabel.text = [dummycontact objectForKey:@"contactName"];

    return cell;
}

---

另一种方法是将联系人信息放在字典中：

- (NSMutableArray*)getContacts {
    NSMutableArray *contacts = [[NSMutableArray alloc] init];

    NSManagedObjectContext *context = [self managedObjectContext];
    DBcontact *contact = [NSEntityDescription insertNewObjectForEntityForName:@"WhappContacts" inManagedObjectContext:context];
    // Test listing all FailedBankInfos from the store
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"WhappContacts" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSError *error;
    NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
    for (contact in fetchedObjects) {
        NSDictionary *contactDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                contact.contactName, @"contactName", nil]; //add other necessary contact information

        [contacts addObject:contactDict];
        // Data seems fine here.
        NSLog(@"Name in: %@", contact.contactName);  
    }

    return contacts;
}

以及检索信息：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //NSLog(@"cell number %i",indexPath.row);
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {        
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Set up the cell...
    NSDictionary *dummycontact = [contacts objectAtIndex:indexPath.row];
    // Only part of the objects in the array contacts contain data!
    NSLog(@"Name cell: %@ %i", [dummycontact objectForKey:@"contactName"], indexPath.row);

    cell.textLabel.text = [dummycontact objectForKey:@"contactName"];

    return cell;
}

---

您使用的是ARC还是预弧代码？您使用的是ARC还是预弧代码？

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    //NSLog(@"cell number %i",indexPath.row);
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {        
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Set up the cell...
    NSDictionary *dummycontact = [contacts objectAtIndex:indexPath.row];
    // Only part of the objects in the array contacts contain data!
    NSLog(@"Name cell: %@ %i", [dummycontact objectForKey:@"contactName"], indexPath.row);

    cell.textLabel.text = [dummycontact objectForKey:@"contactName"];

    return cell;
}