iOS全局禁止横屏，特定页面全屏解决方法

# 1. 全局禁止横屏

在Appdelegate.h添加以下属性：

/***  是否允许横屏的标记 */
@property (nonatomic,assign)BOOL allowRotation;

Appdelegate.m添加如下代码：

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    if (self.allowRotation) {//如果设置了allowRotation属性，支持全屏
        return UIInterfaceOrientationMaskAll;
    }
    return UIInterfaceOrientationMaskPortrait;//默认全局不支持横屏
}

2. 在需要支持横屏的界面改变allowRotation属性

//进入全屏
-(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;

    //强制归正：
    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分别调用以上方法，在该控制器下即可顺利支持全屏。

- (void)viewWillAppear:(BOOL)animated {

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

- (void)viewWillDisappear:(BOOL)animated {

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