启动IPhone应用程序，强制将屏幕从初始时的纵向切换到横评模式
在主UIViewController的源代码内，修改如下代码，参考代码如下所示：
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft || interfaceOrientation == UIInterfaceOrientationLandscapeRight);
}
THE END !
