Question

我正在使用ARC并以iOS 5为目标。我已经在我的一个视图控制器头中声明了一个NSMutableArray ivar，在viewDidLoad中初始化它，并且我试图在我的一些视图控制器的方法中操作它。然而，它表现得非常奇怪。当我像“addObject：”一样向它发送消息，或者尝试将其设置为等于在方法的本地范围内创建的NSMutableArray时，它将消息发送到我声明的其他ivars。

例如，我一直遇到的错误之一是 - [PullToRefreshView count]：发送到实例的无法识别的选择器。 PullToRefreshView是我的另一个ivars，但在我的代码中，我显然是将计数消息发送到我的NSMutableArray ivar。当试图将对象添加到ivar NSMutableArray时，它的计数（在调试器中）保持为0.我一直在搜索我的代码以寻找我可能忽略的东西，但它似乎只是某种ARC内存管理侥幸。有任何想法吗？这是我的代码的相关区域：

MyViewController.h

@interface MyViewController : UIViewController
{
    PullToRefreshView *pull;
    NSMutableArray *commentsSharesMerged;
}

@property (nonatomic, retain) PullToRefreshView *pull;
@property (nonatomic, retain) NSMutableArray *commentsSharesMerged;

- (void)refreshComments;
- (void)refreshShares;

@end

MyViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    commentsSharesMerged = [[NSMutableArray alloc] init];

    pull = [[PullToRefreshView alloc] initWithScrollView:(UIScrollView *)self.suggestionTable];
    [pull setDelegate:self];
    [self.suggestionTable addSubview:pull];
}

- (void)refreshComments
{
NSURL *url = [NSURL URLWithString:@"http://example.com/comments.json"];
__unsafe_unretained __block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

[request setCompletionBlock:^{
    NSString *responseString = [request responseString]; // Use when fetching text data
    NSData *responseData = [responseString dataUsingEncoding:NSUTF8StringEncoding];

    id jsonObject = [[CJSONDeserializer deserializer] deserialize:responseData error:nil];
    NSLog(@"Connection JSON: %@", jsonObject);

    NSMutableArray *commentsArray = [[NSMutableArray alloc] init];

    for (int i = 0; i < [jsonObject count]; i++)
    {
        NSDictionary *currentCommentData = [jsonObject objectAtIndex:i];

        Comment *comment = [[Comment alloc] init];
        comment.identifier = [[currentCommentData objectForKey:@"id"] intValue];
        comment.firstName = [currentCommentData objectForKey:@"first_name"];
        comment.lastName = [currentCommentData objectForKey:@"last_name"];
        comment.commentText = [currentCommentData objectForKey:@"comment"];

        [commentsArray addObject:comment];
    }

    self.commentsSharesMerged = [commentsArray mutableCopy];

    // I've also tried to add the object using something like this
    //for (Comment *comment in commentsArray)
    //    [commentsSharesMerged addObject:comment];
}];

[request setFailedBlock:^{
    NSError *error = [request error];
    NSLog(@"%@", error);
}];

[request startAsynchronous];
}

Answer 1

我找到了解决问题的方法。它可以归因于LLDB调试中的某种内存错误。我将我的计划转移到了GDB，并修复了我的ivar分配问题。

尝试添加对象时，ARC的奇怪NSMutableArray ivar行为

1 个答案: