基于视图的NSTableView在插入带有动画的新行后呈现空白行 [英] View-based NSTableView renders blank rows after inserting new rows with animation
问题描述
我有一个基于视图的 NSTableView ，我支持一个`NSMutableArray。
I have a view-based NSTableView that I'm backing with an `NSMutableArray . Periodically I go out grab some data and want to insert new rows into the table at the top.
当我这样做而没有指定动画时， insertRowsAtIndexes：withAnimation：它似乎工作正常小时结束。但是，如果我指定动画，在大约7或8个插入后，表视图开始显示发生插入的空白行。
When I do this without specifying an animation to insertRowsAtIndexes:withAnimation: it seems to work fine for hours on end. However, if I specify an animation, after about 7 or 8 inserts the table view starts to show blank rows where the inserts occurred. Scrolling down and then back up causes the new rows to render properly.
调用 insertRowsAtIndexes：withAnimation 的代码是在一个块中，而不是在主线程上运行，但我的插入发生在主队列上的dispatch_async内部，所以我不认为它与多线程相关。
The code that calls insertRowsAtIndexes:withAnimation is in a block, and not running on the main thread, but my inserts happen inside of dispatch_async on the main queue, so I dont' think it related to multithreading.
以下是一些代码... self.contents 是我的 NSMutableArray 。
Here is some code ... self.contents is my NSMutableArray.
dispatch_async(dispatch_get_main_queue(), ^{
[self.contentsTableView beginUpdates];
if(posts.count) {
for(NSDictionary* dictionary in [posts reverseObjectEnumerator]) {
FNPost* post = [[FNPost alloc] initWithDictionary:dictionary width:self.contentsTableView.frame.size.width];
post.delegate = self;
[self.contents insertObject:post atIndex:0];
[self.contentsTableView insertRowsAtIndexes:[NSIndexSet indexSetWithIndex:0] withAnimation: NSTableViewAnimationSlideLeft];
}
}
[self.contentsTableView endUpdates];
});
我困惑的一件事是Apple NSTableView insertRowsAtIndexes：withAnimation 的说明文件：
One thing I'm confused about is the part of the Apple NSTableView documentation for insertRowsAtIndexes:withAnimation that says:
表视图中的numberOfRows将自动减少
的索引计数。
The numberOfRows in the table view will automatically be decreased by the count of indexes.
意味着我的数组中的对象数量之间的关系（因此，结果 numberOfRowsInTableView：）和表视图认为它的行数。对我的想法，表视图中的行数应该等于我的数组计数，我想确保我的理解这不是问题的根本，但像我说的，如果没有指定动画，表工作正常。
I'm confused by what that statement implies about the relationship between the number of objects in my array (and hence the result of numberOfRowsInTableView:) and the number of rows the table view thinks it has. To my thinking the number of rows in the table view should equal my array count and I want to make sure that my understanding of this is not at the root of the problem but like I said, the table works fine if no animation is specified.
我在这里做明显错误吗？
Am I doing something obviously wrong here?
推荐答案
原因是在基于层的视图层次中具有NSTableView。两个superviews了，我有一个layer-backed视图。在阅读一些关于NSTableView的其他帖子显示其他错误的行为，当在支持层的层次结构中，我决定关闭IB中的图层。如果我想在我的视图之间使用CA转换，那么现在会出现表动画，因为我希望在保持一些额外状态以控制图层备份状态的情况下。
This issue turns out to be caused by having the NSTableView in a layer based view hierarchy. Two superviews up, I had a layer-backed view. After reading some other posts about NSTableView showing other errant behavior when in a layer-backed hierarchy I decided to turn off the layer in IB. Table animations now occur as I would expect at the expense of having to maintain some additional state to control the layer backing state when I want to use CA transitions between my views.
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