Device Orientation：设备方向
typedefNS_ENUM(NSInteger,UIDeviceOrientation){UIDeviceOrientationUnknown,UIDeviceOrientationPortrait,// Device oriented vertically, home button on the bottomUIDeviceOrientationPortraitUpsideDown,// Device oriented vertically, home button on the topUIDeviceOrientationLandscapeLeft,// Device oriented horizontally, home button on the rightUIDeviceOrientationLandscapeRight,// Device oriented horizontally, home button on the leftUIDeviceOrientationFaceUp,// Device oriented flat, face upUIDeviceOrientationFaceDown// Device oriented flat, face down}
UIInterfaceOrientation：界面方向
typedefNS_ENUM(NSInteger,UIInterfaceOrientation){UIInterfaceOrientationUnknown=UIDeviceOrientationUnknown,UIInterfaceOrientationPortrait=UIDeviceOrientationPortrait,UIInterfaceOrientationPortraitUpsideDown=UIDeviceOrientationPortraitUpsideDown,UIInterfaceOrientationLandscapeLeft=UIDeviceOrientationLandscapeRight,UIInterfaceOrientationLandscapeRight=UIDeviceOrientationLandscapeLeft}
屏幕旋转的两个通知
// 硬件旋转通知，此时界面还未完成旋转可设置界面的旋转UIDeviceOrientationDidChangeNotification// 界面旋转通知，此时界面已经完成旋转UIApplicationDidChangeStatusBarOrientationNotification
判断当前界面方向
BOOL isPortrait=UIInterfaceOrientationIsPortrait([[UIApplication sharedApplication]statusBarOrientation]);BOOL isLandscape=UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication]statusBarOrientation]);
单个页面是否可以旋转
@property(nonatomic,readonly)BOOL shouldAutorotateNS_AVAILABLE_IOS(6_0)__TVOS_PROHIBITED;@property(nonatomic,readonly)UIInterfaceOrientationMask supportedInterfaceOrientationsNS_AVAILABLE_IOS(6_0)__TVOS_PROHIBITED;
面向Orientation的信息：随着屏幕的方向变化
[UISCreen bounds]
[UISCreen applicationFrame]
Status bar frame notifications
Keyboard frame notifications
屏幕旋转时使得View有不同布局的实现方法
// way1-(void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{[superviewWillTransitionToSize:size withTransitionCoordinator:coordinator];[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext>_Nonnull context){if(UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation)){_testTextField.frame=CGRectMake(50,50,150,50);_testButton.frame=CGRectMake(50,120,150,50);}else{_testTextField.frame=CGRectMake(50,50,150,50);_testButton.frame=CGRectMake(220,50,150,50);}}completion:^(id<UIViewControllerTransitionCoordinatorContext>_Nonnull context){}];}
// way2-(void)viewDidLayoutSubviews{[superviewDidLayoutSubviews];if(UIInterfaceOrientationIsPortrait([UIApplication sharedApplication].statusBarOrientation)){_testTextField.frame=CGRectMake(50,50,150,50);_testButton.frame=CGRectMake(50,120,150,50);}else{_testTextField.frame=CGRectMake(50,50,150,50);_testButton.frame=CGRectMake(220,50,150,50);}}
旋转屏幕方向
NSNumber*value0=[NSNumber numberWithInteger:UIDeviceOrientationUnknown];[[UIDevice currentDevice]setValue:value0 forKey:@"orientation"];NSNumber*value=[NSNumber numberWithInteger:UIDeviceOrientationLandscapeLeft];[[UIDevice currentDevice]setValue:value forKey:@"orientation"];
需求：APP总体不跟随设备的旋转来改变界面的方向，个别页面横屏展示
实现思路：首先APP应该支持横屏和竖屏的展示，也就是说在TARGETS中的Device Orientation选项勾选横屏和竖屏选项。假设ViewController是根视图，那么当ViewController的- (BOOL)shouldAutorotate方法返回为YES的时候，界面的方向跟随设备方向变化。在NV结构（NavigationController上放置ViewController的结构）中需横屏展示的ViewController可不是根视图，此时界面是否跟随设备旋转取决于根视图NavigationController的- (BOOL)shouldAutorotate方法的返回值。在这种情况中，可重写NavigationController的- (BOOL)shouldAutorotate方法返回Navigation栈中的顶部ViewController的shouldAutorotate，以此达到在单个页面随时控制其横屏的效果。横屏通过Key-Value的方法修改设备方向来达到目的。
一、勾选横屏和竖屏选项
勾选横屏和竖屏选项
二、重写- (BOOL)shouldAutorotate返回栈顶控制器的shouldAutorotate
@interfaceMyNav:UINavigationController@end@implementationMyNav-(BOOL)shouldAutorotate{returnself.topViewController.shouldAutorotate;}@end
三、在将要横屏显示的ViewController中，重写- (BOOL)shouldAutorotate，重点是用全局变量控制它的返回值
@interfaceLandscapeViewController(){BOOL _allowAutorotate;}-(BOOL)shouldAutorotate{[supershouldAutorotate];return_allowAutorotate;}
四、通过Key-Value改变设备方向
_allowAutorotate=YES;NSNumber*value0=[NSNumber numberWithInteger:UIDeviceOrientationUnknown];[[UIDevice currentDevice]setValue:value0 forKey:@"orientation"];NSNumber*value=[NSNumber numberWithInteger:UIDeviceOrientationLandscapeLeft];[[UIDevice currentDevice]setValue:value forKey:@"orientation"];_allowAutorotate=NO;
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