iPhone4如何查看电源线是否已插入？ [英] iPhone4 how to find out if the power cable is plugged in?

问题描述

我想知道我的应用程序是否在连接外部电源线的情况下运行。是否有可能在运行时找到这种状态？

I would like to know if my app is running with an external power cable attached. Is it possible to find out this state at runtime?

一个额外的问题：这是否可以区分真正的USB电源和那些外部电池组？

An extra question: would this be able to differentiate between true USB power and those external "battery packs"?

谢谢！

推荐答案

使用 UIDevice property batteryState ：

Use UIDevice property batteryState:

[[UIDevice currentDevice] batteryState] == UIDeviceBatteryStateCharging

来自 UIDevice Docs ：

typedef enum {
    UIDeviceBatteryStateUnknown,
    UIDeviceBatteryStateUnplugged,
    UIDeviceBatteryStateCharging,
    UIDeviceBatteryStateFull,
} UIDeviceBatteryState;

至于你的第二个问题。我不相信你可以确定电池组和壁式充电器之间的任何区别，因为上面的 UIDeviceBatteryState 标志是设备电池可以报告的唯一状态。因此，电池组和壁式充电器都会显示为 UIDeviceBatteryStateCharging 或 UIDeviceBatteryStateFull （或 UIDeviceBatteryStateUnplugged 如果电池组已经插上电池但是没电了。）

As for your 2nd question. I don't believe you can determine any difference between a battery pack and a wall charger since the above UIDeviceBatteryState flags are the only "states" a device battery can report. So both a battery pack and wall charger would appear as either UIDeviceBatteryStateCharging or UIDeviceBatteryStateFull (or UIDeviceBatteryStateUnplugged if the battery pack is plugged in but out of juice).

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