iOS6的旋屏控制技巧
在iOS5.1 和 之前的版本中, 我们通常利用 shouldAutorotateToInterfaceOrientation: 来单独控制某个UIViewController的旋屏方向支持,比如:
- - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
- {
- return (interfaceOrientation == UIInterfaceOrientationPortrait);
- }
但是在iOS6中,这个方法被废弃了,使用无效。
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.)
实践后会发现,通过supportedInterfaceOrientations的单独控制是无法锁定屏幕的。
- -(NSUInteger)supportedInterfaceOrientations
- {
- return UIInterfaceOrientationMaskPortrait;
- }
多次实验后总结出控制屏幕旋转支持方向的方法如下:
子类化UINavigationController,增加方法
- - (BOOL)shouldAutorotate
- {
- return self.topViewController.shouldAutorotate;
- }
- - (NSUInteger)supportedInterfaceOrientations
- {
- return self.topViewController.supportedInterfaceOrientations;
- }
并且设定其为程序入口,或指定为 self.window.rootViewController
随后添加自己的view controller,如果想禁止某个view controller的旋屏:(支持全部版本的控制)
- - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
- {
- return (interfaceOrientation == UIInterfaceOrientationPortrait);
- }
- -(BOOL)shouldAutorotate
- {
- return NO;
- }
- -(NSUInteger)supportedInterfaceOrientations
- {
- return UIInterfaceOrientationMaskPortrait;
- }
如果想又开启某个view controller的全部方向旋屏支持:
- - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
- {
- return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
- }
- -(NSUInteger)supportedInterfaceOrientations
- {
- return UIInterfaceOrientationMaskAllButUpsideDown;
- }
- -(BOOL)shouldAutorotate
- {
- return YES;
- }
从而实现了对每个view controller的单独控制。
顺便提一下,如果整个应用所有view controller都不支持旋屏,那么干脆:
- - (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
- {
- return UIInterfaceOrientationMaskPortrait;
- }
下次再说说iOS6的内存控制吧
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