轉(zhuǎn)自https://www.cnblogs.com/block123/p/5917770.html

第一步:

image

Xcode工程配置中的Device Orientation有四個方向,勾選某個方向,即表示支持該方向的旋轉(zhuǎn)(我這里除了倒置其余三個都選中了)

這一步完成,旋轉(zhuǎn)手機或者模擬器,畫面就會對應(yīng)轉(zhuǎn)換橫豎屏(模擬器模擬轉(zhuǎn)換方向按鍵為:command+上下左右)

第二步:

在AppDelegate中添加方法關(guān)閉橫豎屏切換,方法如下

1.AppDelegate.h中外露一個屬性

@property(nonatomic,assign)BOOL allowRotation;//是否允許轉(zhuǎn)向

2.AppDelegate.m中添加方法(如果屬性值為YES,僅允許屏幕向左旋轉(zhuǎn),否則僅允許豎屏)

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

{

    if (_allowRotation == YES) {

        return UIInterfaceOrientationMaskLandscapeLeft;

    }else{

        return (UIInterfaceOrientationMaskPortrait);

    }

}

第三步:

1.在需要強制橫屏的控制器.m中添加旋轉(zhuǎn)為橫屏方法

- (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中添加以下代碼

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

   appDelegate.allowRotation = YES;//(以上2行代碼,可以理解為打開橫屏開關(guān))

[self setNewOrientation:YES];//調(diào)用轉(zhuǎn)屏代碼

3.重寫導(dǎo)航欄返回箭頭按鈕,拿到返回按鈕點擊事件

- (void)back {

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

    appDelegate.allowRotation = NO;//關(guān)閉橫屏僅允許豎屏

    [self setNewOrientation:NO];

    [self.navigationController popViewControllerAnimated:YES];

}