Implement new method to enable app session customization on iOS

[andrejunges]

Related to #132

I don't have any experience with Objective C, so probably there are better ways to implement this functionality.
@davodesign84 it'd be great if you could take a look on it.

[ghost]

DeepCode found the following issues:

Critical: 0
Warning: 0
Info: 0

Priority breakdown:

	Security	Defect	API	Anomaly	Rename	Lint	Info
Critical	0	0	0	0	0	0	0
Warning	0	0	0	0	0	0	0
Info	0	0	0	0	0	0	0

Most affected files:

File	Critical	Warning	Info

See detailed analysis.

[andrejunges]

@davodesign84 any chance you get some time soon to take a look on this?

[louismullie]

@andrejunges Any pointers as to how this method should be called?

[trickeyd]

Yes is there any documentation for this? I am not at all hot on objective C I'm afraid.

[trickeyd]

Ah sorry - it is just in the docs for the js API. I thought this was something I had to call from within the obj c.

For anyone else that arrives here in a similar state of confusion:

iOS is from the JS:

// Allows control of the min/max sessions 
Mixpanel.setAppSessionPropertiesIOS({
  minimumSessionDuration: 20000,
  maximumSessionDuration: 90000,
});

Android is from the AndroidManifest.xml:

<meta-data android:name="com.mixpanel.android.MPConfig.MinimumSessionDuration"
    android:value="20000" />

<meta-data android:name="com.mixpanel.android.MPConfig.SessionTimeoutDuration"
    android:value="90000" />