# 1. 全局禁止橫屏

在Appdelegate.h添加以下屬性：

/***  是否允許橫屏的標記 */
@property (nonatomic,assign)BOOL allowRotation;

Appdelegate.m添加如下代碼：

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    if (self.allowRotation) {//如果設(shè)置了allowRotation屬性，支持全屏
        return UIInterfaceOrientationMaskAll;
    }
    return UIInterfaceOrientationMaskPortrait;//默認全局不支持橫屏
}

2. 在需要支持橫屏的界面改變allowRotation屬性

//進入全屏
-(void)begainFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = YES;
}
// 退出全屏
-(void)endFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = NO;

    //強制歸正：
    if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
        SEL selector = NSSelectorFromString(@"setOrientation:");
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val =UIInterfaceOrientationPortrait;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }
}

在viewWillAppear和viewWillDisappear分別調(diào)用以上方法，在該控制器下即可順利支持全屏。

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];
    [self begainFullScreen];
}

- (void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];
    [self endFullScreen];
}