Swift中是否有API可以确定iOS设备的处理器寄存器大小？

Question

I am displaying to the user whether their device is 32-bit or 64-bit. Currently, I am determining that based on the value of UInt.max:

let cpuRegisterSize = count(String(UInt.max, radix: 2))

It feels a little hacky, so I was wondering if there was an API in Swift that returns that value instead. UIDevice doesn't seem to hold that information, from what I can tell.

Answer 1

On 32-bit devices CGFloat is Float. On 64-bit devices CGFloat is Double. So you can use CGFLOAT_IS_DOUBLE to detect current architecture.

let bit = 32 * (CGFLOAT_IS_DOUBLE + 1)

You can also use sizeof(Int) :

let bit = sizeof(Int) == sizeof(Int64) ? 64 : 32

Answer 2

MemoryLayout<Int>.size == MemoryLayout<Int32>.size ? 32 : 64