一、第一次做轉屏的時候走了不少彎路,過一段時間不寫,發現忘了差不多了,還好有度娘和google,讓我很快找到感覺，下面來談談我對轉屏的了解（有不對的地方或更好的方法請留言，不勝感激?。。。?/p>

iOS6前的轉屏比較簡單就一個方法

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {

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

}

iOS6及以后

①告知Appdelegate要支持轉屏的方向

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

    returnself.orientation;

}

②在需轉屏的viewController

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

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

    del.orientation = UIInterfaceOrientationMaskAllButUpsideDown;

}

③在需轉屏的viewController加

- (NSUInteger)supportedInterfaceOrientations {

    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;

}

- (BOOL)shouldAutorotate {

    returnYES;

}

二、手動轉屏（按一個按鈕或者一個事件觸發）

1、假轉屏

①轉狀態欄

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

②旋轉當前view

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

2、用私有方法轉屏（此類要在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];

    }

}