奇怪的内存管理发生iOS

Question

由于某些原因,在我的下面的代码中,replies数组是NSLogging正确的描述,但comment.replies数组是NSLoggingnull.

我立即假设这是由于我的代码中的内存管理问题,但我不相信这是真的.

请你能告诉我为什么会这样吗？

- (TBComment *) dictionaryToComment:(NSDictionary *)dict {
    TBComment *comment = [[TBComment alloc] init];
    [comment setBody:[dict objectForKey:@"body"]];
    [comment setCommentID:[dict objectForKey:@"id"]];
    [comment setCreated_at:[dict objectForKey:@"created_at"]];
    [comment setUpdated_at:[dict objectForKey:@"updated_at"]];
    [comment setUser:[self dictionaryToUser:[dict objectForKey:@"user"]]];
    NSMutableArray *replies = nil;
    if ([[dict allKeys] containsObject:@"replies"]) {
        replies = [[NSMutableArray alloc] init];
        for (NSDictionary *reply in [dict objectForKey:@"replies"]) {
            NSLog(@"in");
            [replies addObject:[self dictionaryToComment:reply]];
        }
    }
    if (replies != nil) {
        [comment setReplies:replies];
        NSLog(@"COMMENT REPLIES = %@", comment.replies);
        NSLog(@"REPLIES = %@", replies);
        [replies release];
    }
    return [comment autorelease];
}

控制台 - >

2011-11-30 21:25:14.980 Timbrr[2379:f803] in
2011-11-30 21:25:14.980 Timbrr[2379:f803] COMMENT REPLIES = (null)
2011-11-30 21:25:14.980 Timbrr[2379:f803] REPLIES = (
    "<TBComment: 0x68dbeb0>"
)


- (void) setReplies:(NSArray *)_replies {
    hasReplies = (_replies == nil ? NO : ([_replies count] == 0 ? NO : YES));
    //replies is synthesised
}

Answer 1

看到你的实施后setReplies:,我不认为你很明白它是如何@synthesize工作的.

@synthesize replies;将为此实例变量生成一个getter和一个setter.但是因为你正在覆盖它(并且不正确),所以合成的setter被抛到了一边.(事实上​​,根本没有为你创建setter,因为你自己写了一个.)

根本问题是,在实现中setReplies:,实际上并没有将replies实例变量的值赋给setter的参数.

我认为你想要的是:

- (void) setReplies:(NSArray *)_replies {
    hasReplies = (_replies == nil ? NO : ([_replies count] == 0 ? NO : YES));
    // How is your ivar defined in the header file? As _replies, or replies?
    if (replies != _replies) {
        [replies release];
        replies = [_replies retain];
    }
}