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Swift 3: UIImage when set to template image and changed tint color does not show image

In Swift 3, when I try to programmatically change the color of an image loaded from assets just like this: 

let imageView = UIImageView()
let image = UIImage(named: "imageFromAssets")?.withRenderingMode(.alwaysTemplate)
imageView.contentMode = .scaleAspectFit
imageView.tintColor = GREEN_UICOLOR // Change to custom green color
imageView.image = image

The image shows up as a square block below:

Template image with green tint that does not work

However, the funny thing is this does not always happen. With some other images in the assets, it works and changes the tint to green:

Template image with green tint that works

Why is there inconsistent behavior here? And in general how do I add a template image to assets, and be able to programmatically change its color? I realize when I do not change the image to a template image it works, but I can't do that because I want to change the image's tint.

Solution

  • For template images the background needs to be transparent - not white.