得到view的控制器
代码语言：javascript复制/**
view 获取它的控制器
*/
public func viewController()->UIViewController? {
var nextResponder: UIResponder? = self
repeat {
nextResponder = nextResponder?.next
if let viewController = nextResponder as? UIViewController {
return viewController
}
} while nextResponder != nil
return nil
}得到当前控制器 用途：可以判断当前控制器是哪个控制器 等
代码语言：javascript复制///获取当前控制器
func currentVc() ->UIViewController{
var vc = UIApplication.shared.keyWindow?.rootViewController
if (vc?.isKind(of: UITabBarController.self))! {
vc = (vc as! UITabBarController).selectedViewController
}else if (vc?.isKind(of: UINavigationController.self))!{
vc = (vc as! UINavigationController).visibleViewController
}else if ((vc?.presentedViewController) != nil){
vc = vc?.presentedViewController
}
return vc!
} 
