一、屏幕旋转方向监听
1、UIDeviceOrientation：设备方向
iOS 定义了七种设备方向：
typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
UIDeviceOrientationUnknown, // 未知方向，可能是设备(屏幕)斜置
UIDeviceOrientationPortrait, // 设备(屏幕)直立
UIDeviceOrientationPortraitUpsideDown, // 设备(屏幕)直立，上下顛倒
UIDeviceOrientationLandscapeLeft, // 设备(屏幕)向左横置
UIDeviceOrientationLandscapeRight, // 设备(屏幕)向右橫置
UIDeviceOrientationFaceUp, // 设备(屏幕)朝上平躺
UIDeviceOrientationFaceDown // 设备(屏幕)朝下平躺
};
//注意：UIDeviceOrientation参考home键方向，如：home方向在右，设备(屏幕)方向向左（UIDeviceOrientationLandscapeLeft）
当设备方向变化时候，发出UIDeviceOrientationDidChangeNotification通知；注册监听该通知，可以针不同的设备方向处理视图展示。
注：手机锁定竖屏后，UIDeviceOrientationDidChangeNotification通知就失效了。
代码如下：
//开启和监听 设备旋转的通知（不开启的话，设备方向一直是UIInterfaceOrientationUnknown）
if (![UIDevice currentDevice].generatesDeviceOrientationNotifications) {
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleDeviceOrientationChange:)
name:UIDeviceOrientationDidChangeNotification object:nil];
//设备方向改变的处理
- (void)handleDeviceOrientationChange:(NSNotification *)notification{
UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
switch (ddeviceOrientation) {
case UIDeviceOrientationFaceUp:
NSLog(@"屏幕朝上平躺");
break;
case UIDeviceOrientationFaceDown:
NSLog(@"屏幕朝下平躺");
break;
case UIDeviceOrientationUnknown:
NSLog(@"未知方向");
break;
case UIDeviceOrientationLandscapeLeft:
NSLog(@"屏幕向左横置");
break;
case UIDeviceOrientationLandscapeRight:
NSLog(@"屏幕向右橫置");
break;
case UIDeviceOrientationPortrait:
NSLog(@"屏幕直立");
break;
case UIDeviceOrientationPortraitUpsideDown:
NSLog(@"屏幕直立，上下顛倒");
break;
default:
NSLog(@"无法辨识");
break;
}
}
//最后在dealloc中移除通知 和结束设备旋转的通知
- (void)dealloc{
//...
[[NSNotificationCenter defaultCenter]removeObserver:self];
[[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
}
2、UIInterfaceOrientation：界面方向
iOS 定义了五种界面方向
typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
UIInterfaceOrientationUnknown = UIDeviceOrientationUnknown, //未知方向
UIInterfaceOrientationPortrait = UIDeviceOrientationPortrait, //界面直立
UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, //界面直立，上下颠倒
UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight, //界面朝左
UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft //界面朝右
} __TVOS_PROHIBITED;
注：界面方向和设别方向有对应关系，如界面的竖直方向就是 设备的竖直方向：UIInterfaceOrientationUnknown = UIDeviceOrientationUnknown
要想界面旋转，
在如图所示选择支持的界面旋转方向：
3321499760416_.pic_hd.jpg
同时在
UIViewController中加入以下两个方法：
///是否支持自动转屏
-(BOOL)shouldAutorotate
{
return YES;///很明显如果返回YES就可以，返回NO就不行
}
///如果上面方法返回YES则会根据这个方法判断支持的方向
-(UIInterfaceOrientationMask)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskAll;///这个是所有方向
}
当界面方向变化时候，先后发出 UIApplicationWillChangeStatusBarOrientationNotification和 UIApplicationDidChangeStatusBarOrientationNotification通知，手机锁定竖屏后，这两个通知也失效了；注册监听这两个通知，可以针对不同的界面方向处理视图展示。
代码如下所示：
//以监听UIApplicationDidChangeStatusBarOrientationNotification通知为例
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(handleStatusBarOrientationChange:)
name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
//界面方向改变的处理
- (void)handleStatusBarOrientationChange: (NSNotification *)notification{
UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
switch (interfaceOrientation) {
case UIInterfaceOrientationUnknown:
NSLog(@"未知方向");
break;
case UIInterfaceOrientationPortrait:
NSLog(@"界面直立");
break;
case UIInterfaceOrientationPortraitUpsideDown:
NSLog(@"界面直立，上下颠倒");
break;
case UIInterfaceOrientationLandscapeLeft:
NSLog(@"界面朝左");
break;
case UIInterfaceOrientationLandscapeRight:
NSLog(@"界面朝右");
break;
default:
break;
}
}
//最后在dealloc中移除通知
- (void)dealloc{
//...
[[NSNotificationCenter defaultCenter]removeObserver:self];
[[UIDevice currentDevice]endGeneratingDeviceOrientationNotifications];
}
3、UIInterfaceOrientationMask
UIInterfaceOrientationMask是为了集成多种UIInterfaceOrientation而定义的类型，和UIViewController相关，一共有7种
iOS中的UIInterfaceOrientationMask定义
typedef NS_OPTIONS(NSUInteger, UIInterfaceOrientationMask) {
UIInterfaceOrientationMaskPortrait = (1 << UIInterfaceOrientationPortrait),
UIInterfaceOrientationMaskLandscapeLeft = (1 << UIInterfaceOrientationLandscapeLeft),
UIInterfaceOrientationMaskLandscapeRight = (1 << UIInterfaceOrientationLandscapeRight),
UIInterfaceOrientationMaskPortraitUpsideDown = (1 << UIInterfaceOrientationPortraitUpsideDown),
UIInterfaceOrientationMaskLandscape = (UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
UIInterfaceOrientationMaskAll = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortraitUpsideDown),
UIInterfaceOrientationMaskAllButUpsideDown = (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight),
} __TVOS_PROHIBITED;
在ViewController可以重写- (UIInterfaceOrientationMask)supportedInterfaceOrientations方法返回类型，来决定UIViewController可以支持哪些界面方向。
//支持界面直立
- (UIInterfaceOrientationMask)supportedInterfaceOrientations{
return UIInterfaceOrientationMaskPortrait;
}
二、视图控制器中旋转方向的设置
1、禁止横屏操作
- 方法一：在项目的General-->Deployment Info-->Device Orientation中，只勾选Portrait(竖屏)
- 方法二：
Device Orientation默认设置，在Appdelegate中实现supportedInterfaceOrientationsForWindow:只返回UIInterfaceOrientationMaskPortraitt(竖屏)
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
return UIInterfaceOrientationMaskPortrait;
}
参考链接：http://www.cocoachina.com/ios/20170711/19808.html
项目Demo托管在[GitHub][]上
[GitHub]:https://github.com/lizishiye/DeviceOrientation_Demo
