IOS 中禁止横屏

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#define UIInterfaceOrientationIsPortrait(orientation)  ((orientation) == UIInterfaceOrientationPortrait || (orientation) == UIInterfaceOrientationPortraitUpsideDown)

#define UIInterfaceOrientationIsLandscape(orientation) ((orientation) == UIInterfaceOrientationLandscapeLeft || (orientation) == UIInterfaceOrientationLandscapeRight)

-(NSUInteger)supportedInterfaceOrientations{    return UIInterfaceOrientationMaskPortrait;}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{     return UIInterfaceOrientationIsPortrait(toInterfaceOrientation);}

其实只需要

//如果是ios6.0以上的：- (BOOL)shouldAutorotate{return NO;}6.0以下的- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    return NO;}//NO就是不支持翻转，记住要加在根视图上。具体什么时候返回yes就你自己判断了

对于pad横屏，可以这样使用

-(BOOL)shouldAutorotate{    return YES;}-(NSUInteger)supportedInterfaceOrientations{    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)    {        return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;    }        return UIInterfaceOrientationMaskPortrait;}-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)    {        return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);    }        return UIInterfaceOrientationIsPortrait(toInterfaceOrientation);}

对于支持同时支持phone和pad，在禁止phone横屏时，还要考虑pad可以横屏，所以要区分。

-(BOOL)shouldAutorotate{    return YES;}//phone只支持正方向，pad只支持左右横屏-(NSUInteger)supportedInterfaceOrientations{    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)    {        return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;    }        return UIInterfaceOrientationMaskPortrait;}-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad)    {        return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);    }        return UIInterfaceOrientationIsPortrait(toInterfaceOrientation);}

四个朝向：

Portrait: 正方向，下面有home键

Upside Down：反方向

Landscape Left: 向左横屏,Home键左方

Landscape Right：向右横屏

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