一、第一次做转屏的时候走了不少弯路,过一段时间不写,发现忘了差不多了,还好有度娘和google,让我很快找到感觉，下面来谈谈我对转屏的了解（有不对的地方或更好的方法请留言，不胜感激！！！）

iOS6前的转屏比较简单就一个方法

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {

    return (toInterfaceOrientation == UIInterfaceOrientationPortrait) || (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) || (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight);

}

iOS6及以后

①告知Appdelegate要支持转屏的方向

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {

    returnself.orientation;

}

②在需转屏的viewController

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    AppDelegate *del = (AppDelegate *)[UIApplicationsharedApplication].delegate;

    del.orientation = UIInterfaceOrientationMaskAllButUpsideDown;

}

③在需转屏的viewController加

- (NSUInteger)supportedInterfaceOrientations {

    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;

}

- (BOOL)shouldAutorotate {

    returnYES;

}

二、手动转屏（按一个按钮或者一个事件触发）

1、假转屏

①转状态栏

[[UIApplication sharedApplication]  setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:YES];

②旋转当前view

self.view.transform = CGAffineTransformRotate(self.view.transform, M_PI/4);

2、用私有方法转屏（此类要在ARC）,上Appstore慎用

- (void)setCustomOrientation:(NSString *)orientate {

    UIInterfaceOrientation orientation = orientate.intValue;

     if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

        [[UIDevice currentDevice] performSelector:@selector(setOrientation:) withObject:(id)orientation];

    }

}