实现横屏签名

首先是横屏

#pragma mark -----------横屏---------------------
- (BOOL)shouldAutorotate

{
    
    return NO;
    
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations

{
    
    return UIInterfaceOrientationMaskLandscape;
    
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation

{
    
    return UIInterfaceOrientationLandscapeRight;
    
}