屏幕旋转

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第一步

在 AppDelegate.h 里增加一个属性 

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@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

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-(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

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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