iOS电池的监听

#import "ViewController.h"#import <UIKit/UIKit.h>@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 nib.}