转自https://www.cnblogs.com/block123/p/5917770.html

第一步:

image

Xcode工程配置中的Device Orientation有四个方向,勾选某个方向,即表示支持该方向的旋转(我这里除了倒置其余三个都选中了)

这一步完成,旋转手机或者模拟器,画面就会对应转换横竖屏(模拟器模拟转换方向按键为:command+上下左右)

第二步:

在AppDelegate中添加方法关闭横竖屏切换,方法如下

1.AppDelegate.h中外露一个属性

@property(nonatomic,assign)BOOL allowRotation;//是否允许转向

2.AppDelegate.m中添加方法(如果属性值为YES,仅允许屏幕向左旋转,否则仅允许竖屏)

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window

{

    if (_allowRotation == YES) {

        return UIInterfaceOrientationMaskLandscapeLeft;

    }else{

        return (UIInterfaceOrientationMaskPortrait);

    }

}

第三步:

1.在需要强制横屏的控制器.m中添加旋转为横屏方法

- (void)setNewOrientation:(BOOL)fullscreen

{

if (fullscreen) {

        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];

        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

    }else{

        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];

        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];

        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];

        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];

    }

} 

2.view DidLoad中添加以下代码

AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

   appDelegate.allowRotation = YES;//(以上2行代码,可以理解为打开横屏开关)

[self setNewOrientation:YES];//调用转屏代码

3.重写导航栏返回箭头按钮,拿到返回按钮点击事件

- (void)back {

    AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

    appDelegate.allowRotation = NO;//关闭横屏仅允许竖屏

    [self setNewOrientation:NO];

    [self.navigationController popViewControllerAnimated:YES];

}