xcode8中出现错误'cannot call value of non-function type 'UIScreen''

Question

xcode8中的单页面应用程序中，出现错误'cannot call value of non-function type 'UIScreen''
ios新手求指点

Answer 1

swift3.1

window = UIWindow(frame: UIScreen.main.bounds)
window?.backgroundColor = UIColor.white
window?.rootViewController = UIViewController()
window?.makeKeyAndVisible()