iOS 10

[HungChun]

Hi, Is there have any solution on iOS 10?

[mice007]

I've seen Battery Life app can dig up battery design capacity and voltage so it can calculate wear level on iOS10 betas but I did not figure out how it does that yet.

[eldade]

Are you not getting a dictionary at all on iOS 10? I played with it a couple of weeks ago and I think I was seeing a very small dictionary, but I believe it did have the MaximumCapacity key which is probably how Battery Life is reporting the wear level.

[mice007]

Nope, I'm not getting anything back on iOS10 but did not dig into this yet deeply enough to see whats broken... I've made a quick empty project with your solution and nothing worked.. I guess I'll need to do some debug to see what is happening.

[eldade]

Yeah just looked at it and it's totally broken. I'm not sure this mechanism can be made to work on iOS 10 honestly, but I'll keep playing with it. As a side note, there is a new function in UIDeviceListener called _addBatteryPropertyForKey that's reading the data from the main IOKit dictionary and constructing this new, limited dictionary. It is possible that the original dictionary has the full data still available, but it would require the use of IOKit to get to it.

In a way, it almost looks like this approach was taken specifically to prevent this code from working. Considering how many battery apps in the App Store now rely on this code, that wouldn't surprise me...

[HungChun]

I have try to get the data from IOKit but the data is just like Battery life(Voltage, MaxCapacity, CurrentCapacity...), and it doesn't have "Design Capacity". So I think Battery life is write the design capacity data in code. This way still can get the wear level !

[eldade]

Well getting the data from IOKit is easy but Apple tends to reject apps that do that.

    mach_port_t iokitPort = 0;
    CFMutableDictionaryRef properties;
    IOMasterPort(0, &iokitPort);
    CFDictionaryRef serviceName = IOServiceNameMatching("AppleARMPMUCharger");

    io_service_t service = IOServiceGetMatchingService(iokitPort, serviceName);

    if (service == 0)
        return nil;

    kern_return_t status = IORegistryEntryCreateCFProperties(service,
                                                             &properties,
                                                             kCFAllocatorDefault,
                                                             kNilOptions);

    IOObjectRelease(service);

Now the properties dictionary contains all of the data.

[HungChun]

I just got these data, same as yours?

AdapterInfo = 16384;
AtCriticalLevel = 0;
CurrentCapacity = 1376;
ExternalChargeCapable = 1;
ExternalConnected = 1;
FullyCharged = 0;
IOClass = AppleARMPMUCharger;
IsCharging = 1;
MaxCapacity = 1600;
Voltage = 4272;

[eldade]

Yep, that's the lame dictionary we get in iOS 10 unfortunately.

[tahirmt]

Is it possible for you to create a branch with IOKit? I know it wouldn't be accepted on the App Store but I don't need it to. I can't seem to figure out how to write the code myself.

[eldade]

Sure just added a separate project for that called EEIOKitListener that grabs the dictionary and notifies you whenever the data changes. I haven't tested it on iOS 10 but it should work with the limited dictionary.
Grab it from https://github.com/eldoogy/EEIOKitListener.git

[mice007]

About the side note... Where is this "_addBatteryPropertyForKey" ?

[eldade]

That's just one of the internal symbols inside UIKit in the UIDevice implementation.

If you type something like di --name _addBatteryPropertyForKey into lldb, you should see the disassembly listing for that function and see what it does. Note that these functions don't exist in the simulator, only on a physical device so you have to be connected to a physical device and be in a live debugging session on iOS 10 in order to see it (the specific program shouldn't matter, this is just a function from UIKit that'll be loaded for pretty much any iOS app).

[mice007]

Thanks! So basically we only have access to those limited battery info through IOKit (as you using in EEIOKitListener). As I saw in the store there are apps which utilizing this data so probably Apple is not rejecting these apps (for now).

[mice007]

I still cannot figure out how to get any battery data from iOS10 without using the IOKit... any luck with this guys?

[shrikanth2002]

My Project is totally depending on Charging CycleCount and Design Capacity, Now it was broken from iOS 10.0 , My Project is on hold now., Do any one have solution for this.