How to Reload a UITableView While I am Looking at

问题:

When I have a UITableView as part of the visible view controller, how can I reload it so that the data I am looking at changes to the new data. Just calling reload doesn't seem to refresh the data until I scroll it.

回答1:

Calling the reloadData method refreshes the data as soon as the method is called. It does not wait for the table to be scrolled. Make sure the data source (array or dictionary or wherever you've saved the values) is changed before you call reloadData.

回答2:

Are you refreshing the data off the main thread? If so, you need to call the reloadData method using the following method:

- (void)performSelectorOnMainThread:(SEL)aSelector withObject:(id)arg waitUntilDone:(BOOL)wait

So for a tableView it would be:

[tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];

回答3:

Just a 2013 update, you should also be able to reload the data, just as long as you use

dispatch_async(dispatch_get_main_queue(), ^{
    [self.tableView reloadData];
});

GCD is awesome!

回答4:

The following code help you to reload table while you looking that:

[self.tableView reloadData];