IOS中电池变化的监听

11,电池级别和电池状态监听通知
2[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
3	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkBattery:) name:UIDeviceBatteryStateDidChangeNotification object:nil];
4	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkBattery:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
5
62,电池的四种状态：
7NSArray *stateArray = [NSArray arrayWithObjects: @"Battery state is Unknown", @"Battery is not plugged into a charging source", @"Battery is charging", @"Battery state is full", nil];
8
9 3，[[UIDevice currentDevice] batteryLevel] * 100];//电池的级别，一般都是0.0--1.0之间；
10
11[[UIDevice currentDevice] batteryState]；//电池的状态
12
13完整代码：
14
15- (void) doLog: (NSString *) formatstring, ...
16{
17	va_list arglist;
18	if (!formatstring) return;
19	va_start(arglist, formatstring);
20	NSString *outstring = [[[NSString alloc] initWithFormat:formatstring arguments:arglist] autorelease];
21	va_end(arglist);
22	[self.log appendString:outstring];
23	[self.log appendString:@"\n"];
24	self.textView.text = self.log;
25}
26
27- (void) checkBattery: (id) sender
28{
29	NSArray *stateArray = [NSArray arrayWithObjects: @"Battery state is Unknown", @"Battery is not plugged into a charging source", @"Battery is charging", @"Battery state is full", nil];
30	self.log = [NSMutableString string];
31	[self doLog:@"Battery level: %0.2f%", [[UIDevice currentDevice] batteryLevel] * 100];
32	[self doLog:@"Battery state: %@", [stateArray objectAtIndex:[[UIDevice currentDevice] batteryState]]];
33}
34
35- (void) viewDidLoad
36{
37	self.navigationController.navigationBar.tintColor = COOKBOOK_PURPLE_COLOR;
38
39	// Enable battery monitoring
40	[[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
41	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkBattery:) name:UIDeviceBatteryStateDidChangeNotification object:nil];
42	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkBattery:) name:UIDeviceBatteryLevelDidChangeNotification object:nil];
43
44	// Keep checking
45	[NSTimer scheduledTimerWithTimeInterval:0.1f target:self selector:@selector(checkBattery:) userInfo:nil repeats:YES];
46}