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UITableView で任意の位置にスクロールさせる

Last updated at Posted at 2014-05-30

scrollToRowAtIndexPath を使う

スクロールしたい Cell の section, index を渡してあげる。

NSIndexPath* indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

データを更新したあとにスクロールさせたい

データを更新する場合、UITableView のデータを更新が終わったことを検知するような delegate はなさそう。なので、TableView の reload が終わったあとに実行されるよう dispatch_async を使ったところうまく更新できた。

int row = 5; // exmample
[self.tableview reloadData];
dispatch_async(dispatch_get_main_queue(), ^{
	NSIndexPath* indexPath = [NSIndexPath indexPathForRow:row inSection:0];
    [self.tableview scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
}
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