NSBundle *frameworkBundle = [NSBundle bundleForClass:[FrameworkClass class]];
NSString *resourcePath = [frameworkBundle pathForResource:@"an_image" ofType:@"jpeg"];
UIImage *image = [UIImage imageWithContentsOfFile:resourcePath];

[[NSBundle mainBundle] pathForResource:@"FI.framework/Resources/FileName"
                                ofType:@"fileExtension"];

let bundle = Bundle(for: SomeFrameworkClass.self as AnyClass)

if let path = bundle.path(forResource: "test", ofType: "png") {
    if let image = UIImage(contentsOfFile: path) {
        // do stuff
    }
}

let bundle = Bundle(for: type(of: self))
let path = bundle.path(forResource: "filename", ofType: "json")!
let url = URL(fileURLWithPath: path)
let data = try! Data(contentsOf: url)