Question

我正在使用：

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

查找电池状态。我期待找到，如何找到剩余的时间，直到充电完成。例如：剩余1小时20分钟。我怎样才能以编程方式找到它？

Answer 1

我在official documentation中找不到任何方法，在UIDevice类的类转储private header中也没有找到。

所以我们必须提出一些建议。我现在想到的最好的“解决方案”类似于估算下载时间时采用的方法：计算下载/计费的平均速度，并将剩余的数据（数据或费用）除以该速度：

[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
}

剩余时间直到充电完成，iOS

1 个答案: