- -(void)rotation_icon:(float)n{
- UIButton*history_btn=[self.viewviewWithTag:<#(NSInteger)#>][self.viewviewWithTagName:@"home_history"];
- UIButton*cam_btn=[self.viewviewWithTagName:@"cam_btn"];UIButton*cut_btn=[self.viewviewWithTagName:@"cut_btn"];UIButton*light_btn=[self.viewviewWithTagName:@"light_btn"];
- history_btn.transform=CGAffineTransformMakeRotation(n*M_PI/180.0);
- cam_btn.transform=CGAffineTransformMakeRotation(n*M_PI/180.0);
- cut_btn.transform=CGAffineTransformMakeRotation(n*M_PI/180.0);
- light_btn.transform=CGAffineTransformMakeRotation(n*M_PI/180.0);
- }
- -(void)orientationChanged:(NSNotification*)note{UIDeviceOrientationo=[[UIDevicecurrentDevice]orientation];
- switch(o){
- caseUIDeviceOrientationPortrait://Deviceorientedvertically,homebuttononthebottom
- [selfrotation_icon:0.0];
- break;
- caseUIDeviceOrientationPortraitUpsideDown://Deviceorientedvertically,homebuttononthetop
- [selfrotation_icon:180.0];
- break;
- caseUIDeviceOrientationLandscapeLeft://Deviceorientedhorizontally,homebuttonontheright
- [[UIApplicationsharedApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeRightanimated:YES];
- [selfrotation_icon:90.0*3];
- break;
- caseUIDeviceOrientationLandscapeRight://Deviceorientedhorizontally,homebuttonontheleft
- [[UIApplicationsharedApplication]setStatusBarOrientation:UIInterfaceOrientationLandscapeLeftanimated:YES];
- [selfrotation_icon:90.0];
- break;
- default:
- break;
- }
- }
- -(void)viewWillDisappear:(BOOL)animated{
- NSNotificationCenter*nc=[NSNotificationCenterdefaultCenter];
- UIDevice*device=[UIDevicecurrentDevice];//Getthedeviceobject
- [ncremoveObserver:selfname:UIDeviceOrientationDidChangeNotificationobject:device];
- }
- -(void)viewDidAppear:(BOOL)animated{
- //Doanyadditionalsetupafterloadingtheviewfromitsnib.
- //-----SETUPDEVICEORIENTATIONCHANGENOTIFICATION-----
- UIDevice*device=[UIDevicecurrentDevice];//Getthedeviceobject
- [devicebeginGeneratingDeviceOrientationNotifications];//Tellittostartmonitoringtheaccelerometerfororientation
- NSNotificationCenter*nc=[NSNotificationCenterdefaultCenter];//Getthenotificationcentrefortheapp
- [ncaddObserver:selfselector:@selector(orientationChanged:)name:UIDeviceOrientationDidChangeNotificationobject:device];
在特别的场景下，需要针对屏幕旋转作特殊处理。在ios系统下实现相关的功能还是比较方便的。
我下面介绍两种方法：
1.注册UIApplicationDidChangeStatusBarOrientationNotification通知（举例:在一个viewcontroller类的viewdidload中注册该通知），示例代码如下：
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(statusBarOrientationChange:)name:UIApplicationDidChangeStatusBarOrientationNotificationobject:nil];
- (void)statusBarOrientationChange:(NSNotification*)notification
{
UIInterfaceOrientationorientation = [[UIApplicationsharedApplication]statusBarOrientation];
if(orientation ==UIInterfaceOrientationLandscapeRight)// home键靠右
{
//
}
if(
orientation ==UIInterfaceOrientationLandscapeLeft)// home键靠左
{
//
}
if(orientation ==UIInterfaceOrientationPortrait)
{
//
}
if(orientation ==UIInterfaceOrientationPortraitUpsideDown)
{
//
}
}
注意这种方式监听的是StatusBar也就是状态栏的方向，所以这个是跟你的布局有关的，你的布局转了，才会接到这个通知，而不是设备旋转的通知。当我们关注的东西和布局相关而不是纯粹设备旋转，我们使用上面的代码作为实现方案比较适合。
2.注册UIDeviceOrientationDidChangeNotification通知（举例:我们同样在一个viewcontroller类的viewdidload中注册该通知），示例代码如下：
[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(orientChange:)name:UIDeviceOrientationDidChangeNotificationobject:nil];
- (void)orientChange:(NSNotification*)noti
{
NSDictionary* ntfDict = [notiuserInfo];
UIDeviceOrientationorient = [UIDevicecurrentDevice].orientation;
/*
UIDeviceOrientationUnknown,
UIDeviceOrientationPortrait, // Device oriented vertically, home button on the bottom
UIDeviceOrientationPortraitUpsideDown, // Device oriented vertically, home button on the top
UIDeviceOrientationLandscapeLeft, // Device oriented horizontally, home button on the right
UIDeviceOrientationLandscapeRight, // Device oriented horizontally, home button on the left
UIDeviceOrientationFaceUp, // Device oriented flat, face up
UIDeviceOrientationFaceDown // Device oriented flat, face down */
switch(orient)
{
caseUIDeviceOrientationPortrait:
break;
caseUIDeviceOrientationLandscapeLeft:
break;
caseUIDeviceOrientationPortraitUpsideDown:
break;
caseUIDeviceOrientationLandscapeRight:
break;
default:
break;
}
}
注意到这种方式里面的方向还包括朝上或者朝下，很容易看出这个完全是根据设备自身的物理方向得来的，当我们关注的只是物理朝向时，我们通常需要注册该通知来解决问题（另外还有一个加速计的api，可以实现类似的功能，该api较底层，在上面两个方法能够解决问题的情况下建议不要用，使用不当性能损耗非常大）。
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(nullable UIWindow *)window
{
return UIInterfaceOrientationMaskPortrait;
}
参考链接 https://blog.csdn.net/nadeal/article/details/79542682