0x00

*** Terminating app due to uncaught exception 'UIApplicationInvalidInterfaceOrientation', reason: 'preferredInterfaceOrientationForPresentation 'landscapeLeft' must match a supported interface orientation: 'portrait, landscapeRight'!'

0x01

所支持的方向是一個(gè)集合
當(dāng)前設(shè)備方向
應(yīng)該是集合中的一個(gè)值

/// 當(dāng)前方向
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    if (hengping) {
        return UIInterfaceOrientationLandscapeRight;
    }else{
        return UIInterfaceOrientationPortrait;
    }
}

/// 所支持的方向
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeRight;
}

畫線，畫虛線，畫五角星，畫矩形，畫虛線矩形，漸變色

https://github.com/xjh093/JHDraw