Total RAM size of an iOS device

The simplest solution to find total RAM in a device is to use NSProcessInfo:

Objective C:

[NSProcessInfo processInfo].physicalMemory

Swift 3:

NSProcessInfo.processInfo().physicalMemory

Swift 5:

ProcessInfo.processInfo.physicalMemory

Note: physicalMemory gives us the information at bytes, to calculate GB, divide by the constant 1073741824.

As documented here.

Slight change for Swift 3: ProcessInfo.processInfo.physicalMemory

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