iPhone:电池电量过低时收到警告

Question

我想知道当设备电池​​电量很低时，如何在我的应用程序委托(delegate)中收到警告。这样我就可以暂停正在运行的游戏。

有什么想法吗？

Answer 1

您可以使用 UIDevice 中的电池电量属性。例如，如果电池电量低于 5%，则会显示警报。例如，您可以定期轮询应用程序委托(delegate)中的电池电量。

UIDevice *myDevice = [UIDevice currentDevice]; 
[myDevice setBatteryMonitoringEnabled:YES]; 
float batteryLevel = [myDevice batteryLevel];

来自the docs的解释:

batteryLevel
The battery charge level for the device. (read-only)

@property(nonatomic, readonly) float batteryLevel

Discussion
Battery level ranges from 0.0 (fully discharged) to 1.0 (100% charged). Before accessing this property, ensure that battery monitoring is enabled.

If battery monitoring is not enabled, battery state is UIDeviceBatteryStateUnknown and the value of this property is –1.0.

Availability
Available in iOS 3.0 and later.

See Also
@property batteryState
@property batteryMonitoringEnabled

Declared In
UIDevice.h