what is the usage of "~>" in cocoapods

optimistic operator ~>:

'~> 0.1.2' Version 0.1.2 and the versions up to 0.2, not including 0.2 and higher
'~> 0.1' Version 0.1 and the versions up to 1.0, not including 1.0 and higher
'~> 0' Version 0 and higher, this is basically the same as not having it.
For more information, regarding versioning policy, [see][1]:

• ~> 6.0 will get you the latest version before the next version which is 7.0 but not including the 7.0 version.

• ~> 6.0.0 will get you the latest version before the next version which is 6.1.0 but not including the 6.1.0 version.

🎉

~> (the optimistic operator) is used when you want to specify a version 'up to next major | minor | patch'. For example:

~> 0.1.2 will get you a version up to 0.2 (but not including 0.2 and higher)

~> 0.1 will get you a version up to 1.0 (but not including 1.0 and higher)

~> 0 will get you a version of 0 and higher (same as if it was omitted)

where 0.1.2 would mean 'I want this exact version'

Here is some more info on this