swift 通过 string 创建 object 

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class IndexViewController: UIViewController{}
 
let className = "IndexViewController"
 
let bundlePath = NSBundle.mainBundle().bundlePath
let bundleFullName = bundlePath.componentsSeparatedByString("/").last
let bundleName = bundleFullName?.componentsSeparatedByString(".").first
let clazz = NSClassFromString(bundleName! + "." + className)! as! UIViewController.Type
 
let object = clazz.init()
// let object1 = Index() 普通方法