ios tableView reloadRowsAtIndexPaths 不起作用
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ios tableView reloadRowsAtIndexPaths not working
提问by Atul Bhatia
I have an issue where I have a UITableViewControllerand when the view appears I do some calculations asynchronously which should result in the updating of specific rows in the table.
我有一个问题，UITableViewController当视图出现时，我会异步执行一些计算，这应该会导致更新表中的特定行。
Inside the viewWillAppearfunction I calculate the necessary rows that need to be updated as follows:
在viewWillAppear函数内部，我计算需要更新的必要行，如下所示：
- (void)reloadPaths:(NSMutableDictionary *)bookingsDict
{
NSMutableArray* indexArray = [NSMutableArray array];
int i = 0;
for (NSString *dateKey in self.eventsToShow) {
NSMutableDictionary *venues = [bookingsDict objectForKey:dateKey];
if (venues) {
int j = 0;
NSArray *events = [self.eventsToShow objectForKey:dateKey];
for (DCTEvent *event in events) {
NSString *venueIdString = [NSString stringWithFormat:@"%@", event.eventVenueId];
if ([venues objectForKey:venueIdString]) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:j inSection:i];
[indexArray addObject:indexPath];
}
j++;
}
}
i++;
}
[self.tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationFade];
}
However I notice that the cellForRowAtIndexPathfunction is never called after and the cells do not get updated correctly. Any idea what the issue might be?
但是我注意到该cellForRowAtIndexPath函数永远不会被调用，并且单元格没有正确更新。知道可能是什么问题吗？
EDIT: I just noticed that if I scroll out of the view of the cell that is supposed to get updated then it gets updated when I scroll back into view. Is there no way to have it update while in view?
编辑：我刚刚注意到，如果我滚动出应该更新的单元格的视图，那么当我滚动回视图时它会更新。有没有办法让它在视图中更新？
回答by Hsin Chang
How about wrap it?
包起来怎么样？
[tableView beginUpdates];
[tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
[tableView endUpdates];
Here are some similar problems I have found.
以下是我发现的一些类似问题。
cellForRowAtIndexPath isn't called after reloadRowsAtIndexPaths
在 reloadRowsAtIndexPaths 后不调用 cellForRowAtIndexPath
UITableView 的 reloadRowsAtIndexPaths: (NSArray *) indexPaths 无法导致重新加载，除非你调用它两次？
Hope this helps.
希望这可以帮助。
回答by Paresh Navadiya
EDIT: I think you are not getting indexPath check section might be constant as you are increasing while each object gets traversed:
编辑：我认为您没有得到 indexPath 检查部分可能是恒定的，因为您在遍历每个对象时正在增加：
- (void)reloadPaths:(NSMutableDictionary *)bookingsDict
{
NSMutableArray* indexArray = [NSMutableArray array];
int i = 0;
for (NSString *dateKey in self.eventsToShow) {
NSMutableDictionary *venues = [bookingsDict objectForKey:dateKey];
if (venues) {
int j = 0;
NSArray *events = [self.eventsToShow objectForKey:dateKey];
for (DCTEvent *event in events) {
NSString *venueIdString = [NSString stringWithFormat:@"%@", event.eventVenueId];
if ([venues objectForKey:venueIdString]) {
//changed here as section might be constant as i think it might be
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:j inSection:0];
[indexArray addObject:indexPath];
}
j++;
}
}
i++;
}
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
}
Try this :
尝试这个 ：
//your code here
[self.tableView beginUpdates];
[self.tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
回答by Heysem Katibi
For me pushing my reload code to the main queue solved the problem
对我来说，将重新加载代码推送到主队列解决了问题
DispatchQueue.main.async {
self.tableView.reloadRows(at: [indexPath], with: .automatic)
}
