Function to find the annotations that intersect with an array of selections using Apple's PDFKit in iOS

Annotations.swift

func annotationsIn(selections: [PDFSelection]) -> [PDFAnnotation] {
    if selections.count == 0 { return [] }
    var results: [PDFAnnotation] = []
    for selection in selections {
        //See if rect matches the annotations in this page
        let page = selection.pages.first!
        let bounds = selection.bounds(for: page)
        for annotation in page.annotations {
            if bounds.intersects(annotation.bounds) {
                results.append(annotation)
            }
        }
    }
    return results
}