貌似算是一个iOS的bug，很头疼

iOS 6 版本之后屏幕旋转方法发生了变化，一不小心陷入了一个坑里，头疼了半天没找到原因，找到原因之后一顿唉声叹气。。。。貌似算是iOS一个不合理的bug.

要兼容iOS5和iOS6屏幕旋转应该这样写：

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_5_1

- (BOOL)shouldAutorotate

{

    return YES;

}

-(NSUInteger)supportedInterfaceOrientations

{

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        return UIInterfaceOrientationMaskAllButUpsideDown;

    }else{

        return UIInterfaceOrientationMaskLandscape;

    }

}

#endif

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        return interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown;

    }else{

        return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight);

    }

}

这样写在ipad, iphone上ios5和ios6版本都是没有问题的。可关键的是习惯了if else写法，如果写成如下方式就痛苦了。。。

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_5_1

- (BOOL)shouldAutorotate

{

    return YES;

}

-(NSUInteger)supportedInterfaceOrientations

{

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        return UIInterfaceOrientationMaskAllButUpsideDown;

    }else{

        return UIInterfaceOrientationMaskLandscape;

    }

}

#else //这个else在ios5版本上是跑不进来的

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {

        return interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown;

    }else{

        return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation ==UIInterfaceOrientationLandscapeRight);

    }

}

#endif

我到觉得这算是一个ios不合理的方法。

如果大家有好的方式或者解释文档，请在评论里给出答案，以解答我的疑惑。。。感谢大家