iOS 设置随意屏幕旋转

方法一，通过控制器继承或分类实现：

在UITabBarController 的子类或分类中实现

- (BOOL)shouldAutorotate {
    return [self.selectedViewController shouldAutorotate];
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return [self.selectedViewController supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return [self.selectedViewController preferredInterfaceOrientationForPresentation];
}

在UINavigationController 的子类或分类中实现

- (BOOL)shouldAutorotate {
    return [self.topViewController shouldAutorotate];
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return [self.topViewController supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return [self.topViewController preferredInterfaceOrientationForPresentation];
}

在 UIViewController 的子类或分类中实现

- (BOOL)shouldAutorotate {
    // 是否允许转屏
    return NO;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    // 所支持的全部旋转方向
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    // 初始显示的方向
    return UIInterfaceOrientationPortrait;
}

最后在需要改变方向的控制器中重写以下方法实现可旋转功能

- (BOOL)shouldAutorotate {
    // 是否允许转屏
    return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    // 所支持的全部旋转方向
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    // 初始显示的方向
    return UIInterfaceOrientationPortrait;
}

亲测可用

方法二：通过AppDelegate代理方法实现

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    
    if ([[self topViewController] isKindOfClass:[MyInterfaceController class]]) {
        return UIInterfaceOrientationMaskAllButUpsideDown;
    }
    return UIInterfaceOrientationMaskPortrait;//竖屏
}

// 获取当前window的顶层控制器
- (UIViewController *)topViewController {
    UIViewController *resultVC;
    resultVC = [self _topViewController:[[UIApplication sharedApplication].keyWindow rootViewController]];
    while (resultVC.presentedViewController) {
        resultVC = [self _topViewController:resultVC.presentedViewController];
    }
    return resultVC;
}

- (UIViewController *)_topViewController:(UIViewController *)vc {
    if ([vc isKindOfClass:[UINavigationController class]]) {
        return [self _topViewController:[(UINavigationController *)vc topViewController]];
    } else if ([vc isKindOfClass:[UITabBarController class]]) {
        return [self _topViewController:[(UITabBarController *)vc selectedViewController]];
    } else {
        return vc;
    }
    return nil;
}

MyInterfaceController 为需要改变旋转方式的控制器

当从旋转过的屏幕返回不需要旋转的控制器时，需要强制旋转为指定方向，

- (void)viewWillAppear:(BOOL)animated 中调用：

// 强制旋转屏幕
- (void)interfaceOrientation:(UIInterfaceOrientation)orientation
{
    SEL selector  = NSSelectorFromString(@"setOrientation:");
    if ([[UIDevice currentDevice] respondsToSelector:selector]) {
        // NSInvocation中保存了方法所属的对象/方法名称/参数/返回值
        // 其实NSInvocation就是将一个方法变成一个对象
        // 1.创建NSInvocation对象,设置方法签名
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        // 2.设置方法调用者
        [invocation setTarget:[UIDevice currentDevice]];
        // 3.写入签名方法
        [invocation setSelector:selector];
        // 4.设置参数
        int val = orientation;
        [invocation setArgument:&val atIndex:2]; // 设置索引2或更大(如果签名方法再有一个参数测设置3来进行索引传递); 0，1参数为target和selector
        // 开始执行
        [invocation invoke];
    }
}

完毕 ，亲测可用