iOS要实现横竖屏切换很简单，不需要使用任何第三方，只需要实现几个方法就可以了。demo下载地址：https://github.com/qqcc1388/TYOrientationDemo

1.设置系统支持横竖屏【General】->【Targets】-> 【Deployment info】->【Device Orientation】

2.在控制器中实现对应的方法(默认支持竖屏)

-(BOOL)shouldAutorotate{

    return YES;

}

-(UIInterfaceOrientationMask)supportedInterfaceOrientations{

    return UIInterfaceOrientationMaskPortrait;

}

3.某些特定的页面需要横屏支持的，则单独处理（同样需要实现2个方法）

-(BOOL)shouldAutorotate{

    return YES;

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations

{

    return (UIInterfaceOrientationMaskPortrait|UIInterfaceOrientationMaskLandscapeLeft|UIInterfaceOrientationMaskLandscapeRight);

}

4.如果控制器中有用到导航控制器或者tabbarController，这需要在导航控制器和tabbarController分别实现以下2个方法

- (BOOL)shouldAutorotate{

    return [self.selectedViewController shouldAutorotate];

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations{

    return [self.selectedViewController supportedInterfaceOrientations];

}

5.如果需要实现点击按钮切换横竖屏的效果则可以参考如下方案：

//按钮点击事件

- (void)leftAction

{

    [self interfaceOrientation:UIInterfaceOrientationPortrait];

}

- (void)rightAction

{

    [self interfaceOrientation:UIInterfaceOrientationLandscapeRight];

}

- (void)interfaceOrientation:(UIInterfaceOrientation)orientation

{

    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                  = orientation;

        // 从2开始是因为0 1 两个参数已经被selector和target占用

        [invocation setArgument:&val atIndex:2];

        [invocation invoke];

    }

}

6.如果要监听屏幕旋转事件则可以参考如下方案（监听旋转事件，控制键盘，控制frame等操作）

    UIDevice *device = [UIDevice currentDevice]; //Get the device object

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification  object:device];

-(void)orientationChanged:(NSNotification *)noti{

    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

    switch (orientation) {

        case UIDeviceOrientationPortrait:            // Device oriented

            break;

        case UIDeviceOrientationPortraitUpsideDown:  // Device oriented

            break;

        case UIDeviceOrientationLandscapeLeft :      // Device oriented

            break;

        case UIDeviceOrientationLandscapeRight:      // Device oriented horizontally, home button on the left

            break;

        default:

            break;

    }

}