代码控制屏幕横竖旋转

屏幕旋转控制分动态旋转和手动代码控制旋转，多见于视频播放。

一 .APP设置

1. 在配置中关闭屏幕方向。

   
   
   info.plist

2. 在AppDelegate添加如下方法 返回所需要的旋转方向。代码设置的方向优先级将大于info.plist中的设置。

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}

3. UITabBarController方向由选中的controller的方向控制,在UITabBarController中添加如下设置：

- (BOOL)shouldAutorotate
{
    return [self.selectedViewController shouldAutorotate];
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return [self.selectedViewController supportedInterfaceOrientations];
}
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return   [self.selectedViewController preferredInterfaceOrientationForPresentation];;
}

4. 在UINavigationController中由topViewController方向决定

- (BOOL)shouldAutorotate {
    return [self.topViewController shouldAutorotate];
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return [self.topViewController supportedInterfaceOrientations];
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return [self.topViewController preferredInterfaceOrientationForPresentation];
}

二. 旋转控制

1. 在需要动态控制旋转的controller配置:

//是否支持自动转屏
- (BOOL)shouldAutorotate
{
    return YES;
}
// 支持哪些屏幕方向
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}
// 默认的屏幕方向（当前ViewController必须是通过模态出来的UIViewController（模态带导航的无效）方式展现出来的，才会调用这个方法）
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return   UIInterfaceOrientationPortrait;
}

2. 手动控制旋转

/// 旋转
/// @param aUIDeviceOrientation 需要设置的旋转方向
-(void)changeWithDeviceOrientation:(UIDeviceOrientation)aUIDeviceOrientation{
    UIDeviceOrientation deviceOrientation = [[UIDevice currentDevice] orientation];
    if (aUIDeviceOrientation != deviceOrientation) {
        if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
            [[UIDevice currentDevice] setValue:@(aUIDeviceOrientation) forKey:@"orientation"];
        }
    }
}