import "AppDelegate.h"

@property (nonatomic,assign)BOOL allowAcrolls;

• (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
  if (self.allowAcrolls) {
  return UIInterfaceOrientationMaskLandscapeLeft;
  }
  return UIInterfaceOrientationMaskPortrait;
  }
  2.然后在需要强制转换的方法里添加以下代码：

      AppDelegate *appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
  
       appdelegate.allowAcrolls =YES;
  
      [[UIApplication sharedApplication] setStatusBarHidden:YESwithAnimation:UIStatusBarAnimationNone];
  
       NSNumber *orientationTarget = [NSNumber numberWithInt:UIDeviceOrientationLandscapeRight];
  
       [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
  

这样就差不多OK了。