关于开发iPad项目只支持横屏显示的设置

    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:NO];

    self.view.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

    self.view.transform = CGAffineTransformMakeRotation(M_PI*0.5);