剩余时间，直到充电完成，iOS [英] time remaining until charge is complete,iOS

问题描述

我使用的是：

UIDevice *myDevice = [UIDevice currentDevice];
[myDevice setBatteryMonitoringEnabled:YES];
float batLeft = [myDevice batteryLevel];
int i = [myDevice batteryState];    
int batinfo = batLeft * 100;

以查找电池状态。
我正在寻找，如何找到剩余的时间，直到充电完成。
例如：1小时20分钟剩余。
我如何以编程方式找到它？

to find the battery status. I am looking out to find, how to find the time remaining until the charge is complete. ex: 1 hour 20 min remaining. How can I find it programmatically?

推荐答案

=http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html>官方文档，无论是在类转储， UIDevice 的https://github.com/kennytm/iphone-private-frameworks/blob/master/UIKit/UIDevice2.h\">私人标题类。

I haven't found any method for this in the official documentation, neither in the class-dumped, private header of the UIDevice class.

所以我们必须想出一些东西。我目前考虑的最好的解决方案类似于估计下载时间时所采用的方法：计算下载/充电的平均速度，并将剩余的（数据或费用）量除以该速度：

So we have to come up with something. The best "solution" I have in mind at the moment is similar to the approach taken when estimating download time: calculating an average speed of download/charging, and dividing the remaining amount (of data or charge) by that speed:

[UIDevice currentDevice].batteryMonitoringEnabled = YES;
float prevBatteryLev = [UIDevice currentDevice].batteryLevel;
NSDate *startDate = [NSDate date];

[[NSNotificationCenter defaultCenter]
    addObserver:self
       selector:@selector(batteryCharged)
           name:UIDeviceBatteryLevelDidChangeNotification
         object:nil
];

- (void)batteryCharged
{
    float currBatteryLev = [UIDevice currentDevice].batteryLevel;
    // calculate speed of chargement
    float avgChgSpeed = (prevBatteryLev - currBatteryLev) / [startDate timeIntervalSinceNow];
    // get how much the battery needs to be charged yet
    float remBatteryLev = 1.0 - currBatteryLev;
    // divide the two to obtain the remaining charge time
    NSTimeInterval remSeconds = remBatteryLev / avgChgSpeed;
    // convert/format `remSeconds' as appropriate
}

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