版本记录

前言

很多时候我们需要监听和获取电池的电量，ios提供了很多查看的方式，下面我们就一起来看一下。

功能要求

获取设备的电池状态和电量。

功能实现

获取设备的电池状态和电量可以使用UIDevice API，下面我们看一下。

1. UIDevice API获取电池电量

先看一下一个重要的类UIDevice

UIDevice

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIDevice : NSObject 

#if UIKIT_DEFINE_AS_PROPERTIES
@property(class, nonatomic, readonly) UIDevice *currentDevice;
#else
+ (UIDevice *)currentDevice;
#endif

@property(nonatomic,readonly,strong) NSString    *name;              // e.g. "My iPhone"
@property(nonatomic,readonly,strong) NSString    *model;             // e.g. @"iPhone", @"iPod touch"
@property(nonatomic,readonly,strong) NSString    *localizedModel;    // localized version of model
@property(nonatomic,readonly,strong) NSString    *systemName;        // e.g. @"iOS"
@property(nonatomic,readonly,strong) NSString    *systemVersion;     // e.g. @"4.0"
@property(nonatomic,readonly) UIDeviceOrientation orientation __TVOS_PROHIBITED;       // return current device orientation.  this will return UIDeviceOrientationUnknown unless device orientation notifications are being generated.

@property(nullable, nonatomic,readonly,strong) NSUUID      *identifierForVendor NS_AVAILABLE_IOS(6_0);      // a UUID that may be used to uniquely identify the device, same across apps from a single vendor.

@property(nonatomic,readonly,getter=isGeneratingDeviceOrientationNotifications) BOOL generatesDeviceOrientationNotifications __TVOS_PROHIBITED;
- (void)beginGeneratingDeviceOrientationNotifications __TVOS_PROHIBITED;      // nestable
- (void)endGeneratingDeviceOrientationNotifications __TVOS_PROHIBITED;

@property(nonatomic,getter=isBatteryMonitoringEnabled) BOOL batteryMonitoringEnabled NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;  // default is NO
@property(nonatomic,readonly) UIDeviceBatteryState          batteryState NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;  // UIDeviceBatteryStateUnknown if monitoring disabled
@property(nonatomic,readonly) float                         batteryLevel NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;  // 0 .. 1.0. -1.0 if UIDeviceBatteryStateUnknown

@property(nonatomic,getter=isProximityMonitoringEnabled) BOOL proximityMonitoringEnabled NS_AVAILABLE_IOS(3_0); // default is NO
@property(nonatomic,readonly)                            BOOL proximityState NS_AVAILABLE_IOS(3_0);  // always returns NO if no proximity detector

@property(nonatomic,readonly,getter=isMultitaskingSupported) BOOL multitaskingSupported NS_AVAILABLE_IOS(4_0);

@property(nonatomic,readonly) UIUserInterfaceIdiom userInterfaceIdiom NS_AVAILABLE_IOS(3_2);

- (void)playInputClick NS_AVAILABLE_IOS(4_2);  // Plays a click only if an enabling input view is on-screen and user has enabled input clicks.

@end

@protocol UIInputViewAudioFeedback <NSObject>
@optional

@property (nonatomic, readonly) BOOL enableInputClicksWhenVisible; // If YES, an input view will enable playInputClick.

@end

/* The UI_USER_INTERFACE_IDIOM() function is provided for use when deploying to a version of the iOS less than 3.2. If the earliest version of iPhone/iOS that you will be deploying for is 3.2 or greater, you may use -[UIDevice userInterfaceIdiom] directly.
 */
static inline UIUserInterfaceIdiom UI_USER_INTERFACE_IDIOM() {
    return ([[UIDevice currentDevice] respondsToSelector:@selector(userInterfaceIdiom)] ?
            [[UIDevice currentDevice] userInterfaceIdiom] :
            UIUserInterfaceIdiomPhone);
}

UIKIT_EXTERN NSNotificationName const UIDeviceOrientationDidChangeNotification __TVOS_PROHIBITED;
UIKIT_EXTERN NSNotificationName const UIDeviceBatteryStateDidChangeNotification   NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;
UIKIT_EXTERN NSNotificationName const UIDeviceBatteryLevelDidChangeNotification   NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;
UIKIT_EXTERN NSNotificationName const UIDeviceProximityStateDidChangeNotification NS_AVAILABLE_IOS(3_0);

NS_ASSUME_NONNULL_END

这里还要用到个枚举，是电池的状态。

下面看一下代码实现。

typedef NS_ENUM(NSInteger, UIDeviceBatteryState) {
    UIDeviceBatteryStateUnknown,
    UIDeviceBatteryStateUnplugged,   // on battery, discharging
    UIDeviceBatteryStateCharging,    // plugged in, less than 100%
    UIDeviceBatteryStateFull,        // plugged in, at 100%
} __TVOS_PROHIBITED;              // available in iPhone 3.0

这里分为四种状态：

• UIDeviceBatteryStateUnknown 未知
• UIDeviceBatteryStateUnplugged 放电
• UIDeviceBatteryStateCharging 充电
• UIDeviceBatteryStateFull 充满

2. 代码实现

下面我们就看一下代码实现。

#import "JJBatteryDeviceVC.h"

@interface JJBatteryDeviceVC ()

@end

@implementation JJBatteryDeviceVC

#pragma mark - Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    [UIDevice currentDevice].batteryMonitoringEnabled = YES;
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryLevelChanged:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(batteryStatusChanged:) name:UIDeviceBatteryStateDidChangeNotification object:nil];
}

#pragma mark - Action && Notification

- (void)batteryLevelChanged:(NSNotification *)noti
{
    NSLog(@"电池电量 = %.2f",[UIDevice currentDevice].batteryLevel);
}

- (void)batteryStatusChanged:(NSNotification *)noti
{
    NSLog(@"电池状态 = %ld",[UIDevice currentDevice].batteryState);
}

@end

功能验证

下面看一下输出结果。

2017-08-06 23:50:15.224520+0800 JJOC[7999:3191290] 电池电量 = 0.74

下面看一下效果图。

电池电量

可以看见此时电量就是74%。

后记

未完，待续~~~

美女