问题描述
我想知道当设备电池电量非常低时如何在我的应用程序委托中收到警告.这样我就可以暂停正在运行的游戏.
I want to know how can i get warning in my app delegate when the device battery power is very low. So that i can pause the running game.
有什么想法吗?
推荐答案
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%，则显示警报.例如，您可以在应用委托中定期轮询电池电量.
You could use the battery level property from UIDevice. If the battery level is less than 5% show an alert for example. You could poll periodically for the battery level in your app delegate for example.
UIDevice *myDevice = [UIDevice currentDevice];
[myDevice setBatteryMonitoringEnabled:YES];
float batteryLevel = [myDevice batteryLevel];
来自 文档:
电池电量
设备的电池电量.(只读)
batteryLevel
The battery charge level for the device. (read-only)
@property(nonatomic, readonly) float batteryLevel
讨论
电池电量范围从 0.0(完全放电)到 1.0(100% 收费).在访问此属性之前，请确保电池监控已启用.
Discussion
Battery level ranges from 0.0 (fully discharged) to 1.0
(100% charged). Before accessing this property, ensure that battery
monitoring is enabled.
如果未启用电池监控，则电池状态为UIDeviceBatteryStateUnknown，该属性的值为–1.0.
If battery monitoring is not enabled, battery state is
UIDeviceBatteryStateUnknown and the value of this property is –1.0.
可用性
适用于 iOS 3.0 及更高版本.
Availability
Available in iOS 3.0 and later.
另请参阅@property batteryState@property batteryMonitoringEnabled
声明于
UIDevice.h
Declared In
UIDevice.h
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