objective-c - カスタムセルでの UIButton の変更

Question

このコードを使用UIButtonして、UITableView. 問題は、テーブルのボタンをスクロールすると、理由もなく変更されることです。

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setFrame:CGRectMake(232, 88, 78, 24)];

if([[array objectAtIndex:(indexPath.row)] isEqualToString:@"0"])
    [button setImage:[UIImage imageNamed:@"pic1"] forState:UIControlStateNormal];
else
    [button setImage:[UIImage imageNamed:@"pic2"] forState:UIControlStateNormal];

[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[Cell.contentView addSubview:button];

これはbuttonClicked:方法です：

-(void)buttonClicked:(id)sender
{
    CGPoint touchPoint = [sender convertPoint:CGPointZero toView:self.myTableView];
    NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:touchPoint];
    UIButton *button = (UIButton *)sender;
    if([[array objectAtIndex:indexPath.row] isEqualToString:@"0"])
    {
        [button setImage:[UIImage imageNamed:@"pic2"] forState:UIControlStateNormal];
        [array replaceObjectAtIndex:indexPath.row withObject:@"1"];
    }
    else
    {
        [button setImage:[UIImage imageNamed:@"pic1"] forState:UIControlStateNormal];
        [array replaceObjectAtIndex:indexPath.row withObject:@"0"];
    }
}