UITableView reloadData滞后于错误的偏移量

Question

当offset UITableView dataSource添加新帖时，我正在制作某种Facebook时间线类似应用。向[self.tableView reloadData]我- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"PostCell"; PostCell *postCell = (PostCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; // Configure the cell... Post *post = self.displayPosts[indexPath.row]; [postCell setPost:post]; return postCell; } - (void)updatePosts { [[APIClient sharedInstance] downloadPostsForPage:_currentPage withSuccessionBlock:^(NSArray *posts) { NSLog(@"Display new posts!"); [self.displayPosts addObjectsFromArray:posts]; [self.mainTableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:YES]; _isLoadingMore = NO; } failureBlock:^(NSError *err) { // handle error [self handleError:err]; }]; } 添加新帖后，一切都很好，除了小滞后和有时错误的偏移（有时候+/- 150 px取决于你滚动的方向）。

代码：

@interface PostCell ()

@property (weak, nonatomic) IBOutlet PostView *postView;

@property (nonatomic, strong) Post *post;

@end

@implementation PostCell

- (void)setPost:(Post *)newPost
{
    self.postView.post = newPost;
}

发布单元格：

- (void)setPost:(Post *)newPost
{
    if (_post != newPost) {
        _post = newPost;
    }

    [self layoutSubviews];
    [self refreshContent];
}


- (void)layoutSubviews
{
    [super layoutSubviews];
    // define title attributes


    NSDictionary *attributes = @{
    NSForegroundColorAttributeName : [UIColor blackColor],
    NSFontAttributeName            : [UIFont systemFontOfSize:20.0f]};

    CGFloat boundingTitleWidth = self.bounds.size.width - LEFT_TITLE_OFFSET - RIGHT_TITLE_OFFSET;

    CGRect titleRect = [_post.title boundingRectWithSize:CGSizeMake(boundingTitleWidth, CGFLOAT_MAX) options:(NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading) attributes:attributes context:nil];

    if (self.titleLabel == nil) {
     self.titleLabel = [[UILabel alloc] init];
     [self addSubview:self.titleLabel];
    }

    [self.titleLabel setFrame:CGRectMake(LEFT_TITLE_OFFSET, TOP_TITLE_OFFSET, titleRect.size.width, titleRect.size.height)];
    [self.titleLabel setNumberOfLines:0];
    [self.titleLabel sizeToFit];

    // Draw the quarter image.
    CGFloat imageY = TOP_TITLE_OFFSET + titleRect.size.height + TOP_IMAGE_OFFSET;

    CGPoint point = CGPointMake(LEFT_IMAGE_OFFSET, imageY);

    CGSize imageSize = self.post.image.size;

    if (self.imageView == nil) {
     self.imageView = [[UIImageView alloc] init];
     [self addSubview:self.imageView];
    }

    [self.imageView setFrame:CGRectMake(point.x, point.y, imageSize.width, imageSize.height)];
}

- (void)refreshContent
{

    [self.titleLabel setText:_post.title];
    [self.imageView setImage:self.post.image];
}

后览：

{{1}}

任何帮助？

感谢。