强制横屏(仅适用于present情景)

来源：互联网发布：成都软件培训哪家好编辑：程序博客网时间：2024/06/06 10:42

设置横屏很简单，只需要勾选上这两项就可以了

但这是设置全局的横屏允许，很多时候需求是大多界面只允许竖屏，只有某个界面才需要设置横屏(例如播放视频界面等)，所以这时这两项就不能勾选上，那要怎么设置横屏呢，其实很简单，当然本文的方法只适用present视图

首先在appdelegate中添加一个属性

@property (nonatomic,assign) BOOL allowRotation;

然后添加代理方法

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{    if (self.allowRotation) {        return UIInterfaceOrientationMaskLandscape;    }    return UIInterfaceOrientationMaskPortrait;}

在需要设置横屏的视图present前设置为YES

AppDelegate *delegate = (AppDelegate *)[UIApplication sharedApplication].delegate;    delegate.allowRotation = YES;

在横屏视图dismiss前设置为NO即可恢复竖屏

随意转换横竖屏（present 视频播放时全屏转换）

//修改全局属性并调用转屏方法AppDelegate * appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;     appDelegate.allowRotation = NO;      [self setNewOrientation:NO];//调用转屏代码//强制转屏- (void)setNewOrientation:(BOOL)fullscreen{    if (fullscreen) {        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];//横屏方向（根据需求选填）        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];    }else{        NSNumber *resetOrientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationUnknown];        [[UIDevice currentDevice] setValue:resetOrientationTarget forKey:@"orientation"];        NSNumber *orientationTarget = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];        [[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];    }}

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