How to load an image in prepareForInterfaceBuilder with a IBDesignable UIImageView

Question

I would like to load a sample image in an IB designable UIImageView, to be shown in Interface Builder while editing the interface. The following code does not w

Answer 1

Updated for Swift 4.2

When you instantiate an UIImage (with UIImage(named : "SomeName") the app will look for the asset in your main bundle, which works fine usually. But when you are at design time, the InterfaceBuilder holds the code of the designable views (for compiling while designing) in a separate bundle.

So the solution is: Define your bundle dynamically, hence your files can be found in design, compile and run time:

    // DYNAMIC BUNDLE DEFINITION FOR DESIGNABLE CLASS
    let dynamicBundle = Bundle(for: type(of: self))

    // OR ALTERNATIVELY BY PROVDING THE CONCRETE NAME OF YOUR DESIGNABLE VIEW CLASS
    let dynamicBundle = Bundle(for: YourDesignableView.self)

    // AND THEN SUCCESSFULLY YOU CAN LOAD THE RESSOURCE
    let image = UIImage(named: "Logo", in: dynamicBundle, compatibleWith: nil)