cannot select UITableViewCell programmatically

问题

I am attempting to select, in the view did appear method, a table cell programatically.

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection:1];

[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];

my delegate,

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

does not get called.

The delegate gets called if i select the cells in the simulator with a mouse, however, just not programmatically.

Why can this be?

回答1:

Because that's how the framework works. Try reading the docs. That's what they are for!

selectRowAtIndexPath:animated:scrollPosition:

Selects a row in the receiver identified by index path, optionally scrolling the row to a location in the receiver... Calling this method does not cause the delegate to receive a tableView:willSelectRowAtIndexPath: or tableView:didSelectRowAtIndexPath: message.

That's pretty easy to understand. The delegate method didSelectRowAtIndexPath: is not called if you select the row in code (programmatically). It is called only if the user selects the row.

And this makes perfect sense, because:

• If you are selecting the row in code, you might not want the delegate method triggered.

• If you do want the delegate method triggered, since you are in your own code, you can just call it.

• You don't need the delegate method in order to learn that the row was selected, because you selected it in code - you cannot not know!

来源：https://stackoverflow.com/questions/16504078/cannot-select-uitableviewcell-programmatically