scrollToRowAtIndexPath崩溃

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[self.commentTab reloadData];
[self.commentTab layoutIfNeeded];

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

NSInteger rows = [self.commentTab numberOfRowsInSection:0];
NSIndexPath *ip = [NSIndexPath indexPathForRow:rows-1 inSection:0];
[self.commentTab scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionBottom animated:YES];

});