iOS App开发中通过UIDevice类获取设备信息的方法

//是否开启监测电池状态 开启后 才可以正常获取电池状态
@property(nonatomic,getter=isBatteryMonitoringEnabled) BOOL batteryMonitoringEnabled NS_AVAILABLE_IOS(3_0);  // default is NO
//获取电池状态
@property(nonatomic,readonly) UIDeviceBatteryState          batteryState NS_AVAILABLE_IOS(3_0); 
//获取电量
@property(nonatomic,readonly) float                         batteryLevel NS_AVAILABLE_IOS(3_0);

设备方向的枚举如下：
typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,            // home键在下
    UIDeviceOrientationPortraitUpsideDown,  // home键在上
    UIDeviceOrientationLandscapeLeft,       // home键在右
    UIDeviceOrientationLandscapeRight,      // home键在左
    UIDeviceOrientationFaceUp,              // 屏幕朝上
    UIDeviceOrientationFaceDown             // 屏幕朝下
};

电池状态的枚举如下：
typedef NS_ENUM(NSInteger, UIDeviceBatteryState) {
    UIDeviceBatteryStateUnknown,
    UIDeviceBatteryStateUnplugged,   // 放电状态
    UIDeviceBatteryStateCharging,    // 充电未充满状态
    UIDeviceBatteryStateFull,        // 充电已充满
};

下面的方法关于监测屏幕状态：
//获取是否开启屏幕状态更改通知
@property(nonatomic,readonly,getter=isGeneratingDeviceOrientationNotifications) BOOL generatesDeviceOrientationNotifications;
//开始监测通知
- (void)beginGeneratingDeviceOrientationNotifications;    
//结束监测通知
- (void)endGeneratingDeviceOrientationNotifications;

下面这两个放大与距离传感器应用相关
@property(nonatomic,getter=isProximityMonitoringEnabled) BOOL proximityMonitoringEnabled NS_AVAILABLE_IOS(3_0); //开启距离传感器
//是否触发了距离传感器
@property(nonatomic,readonly)                            BOOL proximityState

相关通知：
//设备方向改变时发送的通知
UIKIT_EXTERN NSString *const UIDeviceOrientationDidChangeNotification;