在iOS5.1 和 之前的版本中, 我們通常利用 shouldAutorotateToInterfaceOrientation: 來單獨控制某個UIViewController的旋屏方向支援,比如:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); }
但是在iOS6中,這個方法被廢棄了,使用無效。
shouldAutorotateToInterfaceOrientation:
Returns a Boolean value indicating whether the view controller supports the specified orientation. (Deprecated in iOS 6.0. Override the supportedInterfaceOrientations andpreferredInterfaceOrientationForPresentation methods instead.)
實踐後會發現,通過supportedInterfaceOrientations的單獨控制是無法鎖定螢幕的。
-(NSUInteger)supportedInterfaceOrientations { return UIInterfaceOrientationMaskPortrait; }
多次實驗後總結出控制旋轉螢幕支援方向的方法如下:
子類化UINavigationController,增加方法
- (BOOL)shouldAutorotate { return self.topViewController.shouldAutorotate; } - (NSUInteger)supportedInterfaceOrientations { return self.topViewController.supportedInterfaceOrientations; }
並且設定其為程式入口,或指定為 self.window.rootViewController
隨後添加自己的view controller,如果想禁止某個view controller的旋屏:(支援全部版本的控制)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); } -(BOOL)shouldAutorotate { return NO; } -(NSUInteger)supportedInterfaceOrientations { return UIInterfaceOrientationMaskPortrait; }
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如果想又開啟某個view controller的全部方向旋屏支援:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); } -(NSUInteger)supportedInterfaceOrientations { return UIInterfaceOrientationMaskAllButUpsideDown; } -(BOOL)shouldAutorotate { return YES; }
從而實現了對每個view controller的單獨控制。
順便提一下,如果整個應用所有view controller都不支援旋屏,那麼乾脆:
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window { return UIInterfaceOrientationMaskPortrait; }
下次再說說iOS6的記憶體控制吧