UIImageView setImage or setBackgroundColor, which one is better in iOS

Question

I might get down-votes for this question but i am curios and couldn't find any explanation. So I am gonna post it here.

My question is, I have to show custom separator image in my custom cell. If I simply set background colour of imageView, rather than setting UIImage, is it better approach?

Here is the example screenshot to explain my question.

In this screenshot, I have black and grey separators.

[barImage setBackgroundColor:[UIColor blackColor]];
[greyBarImage setBackgroundColor:[UIColor greyColor]];

OR

[barImage setImage:[UIImage imageNamed:@"black.png"]];
[greyBarImage setImage:[UIImage imageNamed:@"grey.png"]];

Now, which one is better? All I know the imageNamed: is bit slower and we should avoid, but I am not sure about that.

EDIT:

This is what I know after posting this question:

Setting Image:

• It will cost the RAM
• Image will not cover the whole imageView, so there might be un-opaque portions on UIImageView

Setting background colour:

• This is an overhead on CPU but will decrease app memory.
• Background colour will cover the whole UIImageView, so the whole imageView will be opaque and will respond to touches.

Answer 1

If both solution works for you the setting background colour would be better than setting image

[barImage setBackgroundColor:[UIColor blackColor]];
[greyBarImage setBackgroundColor:[UIColor greyColor]];

As this will

1.Save your app resources(Image).

2.Avoid runtime image loading issue(in case of rename replace).

Please refer Simple drawing app and Image drawing app.