import KSGuideController

var items = [KSGuideItem]()
for button in buttons {
    let n = Int(arc4random()) % string.characters.count
    let index = string.index(string.startIndex, offsetBy: Int(n))
    let text = string.substring(to: index)
    let item = KSGuideItem(sourceView: button, text: text)
    items.append(item)
}
let vc = KSGuideController(items: items, key: "MainGuide")
vc.setIndexWillChangeBlock { (index, item) in
    print("Index will change to \(index)")
}
vc.setIndexDidChangeBlock { (index, item) in
    print("Index did change to \(index)")
}
vc.show(from: self) { 
    print("Guide controller has been dismissed")
}