How to draw an outline around a column? - ios

Question

I would like to draw an outline around a column. here is how my app actually looks like: https://gyazo.com/80dffe6a153e82565a610222a43e0c11
So the white column represent the day on where we are actually. But I don't really want to do that.
Actually I'm doing this:
if(column == _intOfTheDay){ //intOfTheDay represent the day one where we are actually
cell.backgroundColor = [[UIColor whiteColor]colorWithAlphaComponent:0.95];
}
I've tried something like this to get closer of the result that I want:
if(column == _intOfTheDay){
cell.layer.borderWidth = 5.0f;
cell.layer.borderColor = [UIColor redColor].CGColor;
}
But the problem here (without all the bugs due to the UICollectionView) is that it draw a rectangle around each cell. And what I would like is to draw only one rectangle but around all the column.
How could I process?
Every help will be appreciated, thanks in advance.

Answer 1

If you don't want to subclass the UICollectionViewCell then use this :
float borderWidth = 5.0;
CALayer *leftBorder = [CALayer new];
leftBorder.frame = CGRectMake(0.0, 0.0, borderWidth, cell.frame.size.height);
leftBorder.backgroundColor = [UIColor redColor].CGColor;
[cell.layer addSublayer:leftBorder];
CALayer *rightBorder = [CALayer new];
rightBorder.frame = CGRectMake(cell.frame.size.width - borderWidth, 0.0, borderWidth, cell.frame.size.height);
rightBorder.backgroundColor = [UIColor redColor].CGColor;
[cell.layer addSublayer:rightBorder];

Answer 2

You can do something like this, set three border to first cell of column- left,right and top and for last cell of column left,right and bottom and for all middle cell left and right. you can use CALayer to set one side border like below example,
CALayer *TopBorder = [CALayer layer];
TopBorder.frame = CGRectMake(0.0f, 0.0f, self.myImageView.frame.size.width, 3.0f);
TopBorder.backgroundColor = [UIColor redColor].CGColor;
[cell.layer addSublayer:TopBorder];