iOS6的旋屏控制技巧

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：

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1. -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
2. {
3. return(interfaceOrientation==UIInterfaceOrientationPortrait);
4. }

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 thesupportedInterfaceOrientationsandpreferredInterfaceOrientationForPresentationmethods instead.)

实践后会发现，通过supportedInterfaceOrientations的单独控制是无法锁定屏幕的。

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1. -(NSUInteger)supportedInterfaceOrientations
2. {
3. returnUIInterfaceOrientationMaskPortrait;
4. }

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

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1. -(BOOL)shouldAutorotate
2. {
3. returnself.topViewController.shouldAutorotate;
4. }
6. -(NSUInteger)supportedInterfaceOrientations
7. {
8. returnself.topViewController.supportedInterfaceOrientations;
9. }

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）

[cpp] view plain copy print ?

1. -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
2. {
3. return(interfaceOrientation==UIInterfaceOrientationPortrait);
4. }
6. -(BOOL)shouldAutorotate
7. {
8. returnNO;
9. }
11. -(NSUInteger)supportedInterfaceOrientations
12. {
13. returnUIInterfaceOrientationMaskPortrait;
14. }

如果想又开启某个view controller的全部方向旋屏支持：

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1. -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
2. {
3. return(interfaceOrientation!=UIInterfaceOrientationPortraitUpsideDown);
4. }
6. -(NSUInteger)supportedInterfaceOrientations
7. {
8. returnUIInterfaceOrientationMaskAllButUpsideDown;
9. }
11. -(BOOL)shouldAutorotate
12. {
13. returnYES;
14. }

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：

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1. -(NSUInteger)application:(UIApplication*)applicationsupportedInterfaceOrientationsForWindow:(UIWindow*)window
2. {
3. returnUIInterfaceOrientationMaskPortrait;
4. }