强制横屏和竖屏

-(void)viewWillAppear:(BOOL)animated{
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationLandscapeLeft] forKey:@"orientation"];
    
}

-(void)viewWillDisappear:(BOOL)animated{
    [[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIDeviceOrientationPortrait] forKey:@"orientation"];
}