UIDevice

UIDevice       UIDevice提供了多种属性、类函数及状态通知，帮助我们全方位了解设备状况。从检测电池电量到定位设备与临近感应，UIDevice所做的工作就是为应用程序提供用户及设备的一些信息。UIDevice类还能够收集关于设备的各种具体细节，例如机型及iOS版本等。其中大部分属性都对开发工作具有积极的辅助作用。下面的代码简单的使用UIDevice获取手机属性。    typedef NS_ENUM(NSInteger, UIDeviceOrientation) //设备方向    {        UIDeviceOrientationUnknown,        UIDeviceOrientationPortrait,                   // 竖向，头向上        UIDeviceOrientationPortraitUpsideDown,  // 竖向，头向下        UIDeviceOrientationLandscapeLeft,         // 横向，头向左        UIDeviceOrientationLandscapeRight,       // 横向，头向右        UIDeviceOrientationFaceUp,                   // 平放，屏幕朝下        UIDeviceOrientationFaceDown                // 平放，屏幕朝下    };       typedef NS_ENUM(NSInteger, UIDeviceBatteryState) //电池状态    {        UIDeviceBatteryStateUnknown,        UIDeviceBatteryStateUnplugged,   // 未充电        UIDeviceBatteryStateCharging,     // 正在充电        UIDeviceBatteryStateFull,             // 满电    };       typedef NS_ENUM(NSInteger, UIUserInterfaceIdiom) //用户界面类型    {        //iOS3.2以上有效#if __IPHONE_3_2 <= __IPHONE_OS_VERSION_MAX_ALLOWED        UIUserInterfaceIdiomPhone,           // iPhone 和 iPod touch 风格        UIUserInterfaceIdiomPad,              // iPad 风格#endif    };   #define UI_USER_INTERFACE_IDIOM() ([[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] ? [[UIDevice currentDevice] userInterfaceIdiom] : UIUserInterfaceIdiomPhone)   #define UIDeviceOrientationIsPortrait(orientation)  ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown)#define UIDeviceOrientationIsLandscape(orientation) ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight)       NS_CLASS_AVAILABLE_IOS(2_0) @interface UIDevice : NSObject {    @private        NSInteger _numDeviceOrientationObservers;        float    _batteryLevel;        struct {            unsigned int batteryMonitoringEnabled:1;            unsigned int proximityMonitoringEnabled:1;            unsigned int expectsFaceContactInLandscape:1;            unsigned int orientation:3;            unsigned int batteryState:2;            unsigned int proximityState:1;        } _deviceFlags;    }       + (UIDevice *)currentDevice; // 获取当前设备       @property(nonatomic,readonly,retain) NSString    *name;                // e.g. "My iPhone"    @property(nonatomic,readonly,retain) NSString    *model;               // e.g. @"iPhone", @"iPod touch"    @property(nonatomic,readonly,retain) NSString    *localizedModel;    // localized version of model    @property(nonatomic,readonly,retain) NSString    *systemName;      // e.g. @"iOS"    @property(nonatomic,readonly,retain) NSString    *systemVersion;    // e.g. @"4.0"    @property(nonatomic,readonly) UIDeviceOrientation orientation;       // 除非正在生成设备方向的通知，否则返回UIDeviceOrientationUnknown 。       @property(nonatomic,readonly,retain) NSUUID      *identifierForVendor NS_AVAILABLE_IOS(6_0);      // 可用于唯一标识该设备，同一供应商不同应用具有相同的UUID 。       @property(nonatomic,readonly,getter=isGeneratingDeviceOrientationNotifications) BOOL generatesDeviceOrientationNotifications; //是否生成设备转向通知    - (void)beginGeneratingDeviceOrientationNotifications;    - (void)endGeneratingDeviceOrientationNotifications;       @property(nonatomic,getter=isBatteryMonitoringEnabled) BOOL batteryMonitoringEnabled NS_AVAILABLE_IOS(3_0);  // 是否启动电池监控，默认为NO    @property(nonatomic,readonly) UIDeviceBatteryState batteryState NS_AVAILABLE_IOS(3_0);  // 如果禁用电池监控，则电池状态为UIDeviceBatteryStateUnknown    @property(nonatomic,readonly) float batteryLevel NS_AVAILABLE_IOS(3_0);  //电量百分比， 0 .. 1.0。如果电池状态为UIDeviceBatteryStateUnknown，则百分比为-1.0       @property(nonatomic,getter=isProximityMonitoringEnabled) BOOL proximityMonitoringEnabled NS_AVAILABLE_IOS(3_0); // 是否启动接近监控（例如接电话时脸靠近屏幕），默认为NO    @property(nonatomic,readonly)  BOOL proximityState NS_AVAILABLE_IOS(3_0);  // 如果设备不具备接近感应器，则总是返回NO       @property(nonatomic,readonly,getter=isMultitaskingSupported) BOOL multitaskingSupported NS_AVAILABLE_IOS(4_0); // 是否支持多任务       @property(nonatomic,readonly) UIUserInterfaceIdiom userInterfaceIdiom NS_AVAILABLE_IOS(3_2); // 当前用户界面模式       - (void)playInputClick NS_AVAILABLE_IOS(4_2);  // 播放一个输入的声音    @end       @protocol UIInputViewAudioFeedback    @optional    @property (nonatomic, readonly) BOOL enableInputClicksWhenVisible; // 实现该方法，返回YES则自定义的视图能够播放输入的声音    @end       UIKIT_EXTERN NSString *const UIDeviceOrientationDidChangeNotification; // 屏幕方向变化通知    UIKIT_EXTERN NSString *const UIDeviceBatteryStateDidChangeNotification   NS_AVAILABLE_IOS(3_0); // 电池状态变化通知    UIKIT_EXTERN NSString *const UIDeviceBatteryLevelDidChangeNotification   NS_AVAILABLE_IOS(3_0); // 电池电量变化通知    UIKIT_EXTERN NSString *const UIDeviceProximityStateDidChangeNotification NS_AVAILABLE_IOS(3_0); // 接近状态变化通知