认识达内从这里开始

import "ViewController.h"

#import

@interface ViewController ()

//@property(nonatomic,readonly) float batteryLevel NS_AVAILABLE_IOS(3_0);

// 0 .. 1.0. -1.0 if UIDeviceBatteryStateUnknown它返回的是0.00-1.00之间的浮点值。

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

//打开电池的监听

[UIDevice currentDevice].batteryMonitoringEnabled = YES;

//获取电池的状态

UIDeviceBatteryState BatteryState = [UIDevice currentDevice].batteryState;

//获取剩余电量 范围在0.000000 至 1.000000之间

CGFloat batterylevel = [UIDevice currentDevice].batteryLevel;

//battery的状态分为：

/*

UIDeviceBatteryStateUnknown, 未知

UIDeviceBatteryStateUnplugged, // 未充电

UIDeviceBatteryStateCharging, // 正在充电

UIDeviceBatteryStateFull, // 满电

*/

if (BatteryState == UIDeviceBatteryStateUnknown) {

self.dlLabel.text = [NSString stringWithFormat:@"%0.0f%%",batterylevel*100];

NSLog(@"unknow");

}else{

NSLog(@"know");

//将剩余的电量用label显示。

self.dlLabel.text = [NSString stringWithFormat:@"%0.0f%%",batterylevel*100];

}

//

// [self getCurrentBatteryLevel];

// [UIDevice currentDevice].batteryMonitoringEnabled = YES;

// [[NSNotificationCenter defaultCenter]

// addObserverForName:UIDeviceBatteryLevelDidChangeNotification

// object:nil queue:[NSOperationQueue mainQueue]

// usingBlock:^(NSNotification *notification) {

// // Level has changed

// dl=[UIDevice currentDevice].batteryLevel;

// NSLog(@"电池电量：%.2f", [UIDevice currentDevice].batteryLevel);

//

// self.dlLabel.text = [NSString stringWithFormat:@"%f",[UIDevice currentDevice].batteryLevel];

//

// }];

// Do any additional setup after loading the view, typically from a ib.

}