個人習慣，喜歡寫一個子類BaseNavigationController,在BaseNavigationController中寫入下邊的代碼：廢話不多說，看代碼，不解釋
class BaseNavigationController: UINavigationController,UIGestureRecognizerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.interactivePopGestureRecognizer!.delegate = self
}
func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool
{
if (self.viewControllers.count <= 1 ) {
return false;
}
return true;
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
override func pushViewController(viewController: UIViewController, animated: Bool) {
super.pushViewController(viewController, animated: animated)
self.interactivePopGestureRecognizer!.enabled = true
}
}