iOS 6.0中UIViewController被弃用的一些方法

概念：deprecated 弃用。表示已不被建议使用，可能随时取消它；建议采用新的来替代。

"modalViewController" 属性 is deprecated : first deprecated in iOS 6.0

而采用

presentedViewController

"dismissModalViewControllerAnimated" is deprecated : first deprecated in iOS 6.0

而采用

dismissViewControllerAnimated:(BOOL) completion:^(void)completion

如：[self dismissViewControllerAnimated:YES completion:nil];

"presentModalViewController: animated:" is deprecated : first deprecated in iOS 6.0

而采用

presentViewController:(UIViewController
*) animated:(BOOL) completion:^(void)completion

如：[self.viewController presentViewController:controller animated:YES completion:nil];

"automaticallyForwardAppearanceAndRotationMethodsToChildViewControllers" is
deprecated : first deprecated in iOS 6.0

而采用

shouldAutomaticallyForwardRotationMethods 和 shouldAutomaticallyForwardAppearanceMethods

"shouldAutorotateToInterfaceOrientation:" is deprecated : first deprecated in iOS 6.0

而采用

重载 supportedInterfaceOrientations 和 preferredInterfaceOrientationForPresentation 方法

"viewDidUnload"和"viewWillUnload" 在iOS 6.0从不调用。