Path to bundle of iOS framework

Try below code to get the custom bundle:

let bundlePath = Bundle.main.path(forResource: "CustomBunlde", ofType: "bundle")
let resourceBundle = Bundle.init(path: bundlePath!)

Update

If in your framework, try this:

[[NSBundle bundleForClass:[YourClass class]] URLForResource:@"YourResourceName" withExtension:@".suffixName"];

Use Bundle(for:Type):

let bundle = Bundle(for: type(of: self))
let path = bundle.path(forResource: filename, ofType: type)

or search the bundle by identifier (the frameworks bundle ID):

let bundle = Bundle(identifier: "com.myframework")

Swift 5

let bundle = Bundle(for: Self.self)
let path = bundle.path(forResource: "filename", ofType: ".plist")

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