Navigation bar button image not showing in Swift
The way to resolve navigation button images appearing as blue is to select the image set in Assets.
And then choose Original Image from the Render As select options.
You should have a image with alpha.(The sample image you posted has white background). Also you should set the image with template mode. I dont know how to do that in Interface builder. This is a sample code to convert the image to template.
var image = UIImage(named: "").imageWithRenderingMode(UIImageRenderingMode.AlwaysTemplate)