第一步

在 AppDelegate.h 里增加一个属性 

@property (nonatomic, assign) NSInteger allowRotation;

用来区分哪个界面可以横屏

哪个界面不可以

第二步

在 AppDelegate.m 里增加一个方法

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    if(self.allowRotation==1)
    {
        return UIInterfaceOrientationMaskAll;
    }
    else
    {
        return UIInterfaceOrientationMaskPortrait;
    }
}

第三步

在需要横屏的界面调用以下代码即可

    AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    appDelegate.allowRotation = 1;
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIInterfaceOrientationPortrait] forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger: UIDeviceOrientationLandscapeRight] forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationPortraitUpsideDown] forKey:@"orientation"];
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationLandscapeLeft] forKey:@"orientation"];

Demo地址：https://github.com/YouZhiZheShiJingCheng/revolve/tree/master