设置横屏与竖屏的方法

找到RootViewController.m这个文件，打开

找到这个方法

// Override to allow orientations other than the default portrait orientation.

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

// return YES for the supported orientations

// Only landscape  仅支持横向

// return ( UIInterfaceOrientationIsLandscape( interfaceOrientation ) );

// Only portrait    仅支持竖向

// return ( ! UIInterfaceOrientationIsLandscape( interfaceOrientation ) );

// All orientations  既支持竖向又支持横向

// return YES;

}