use switch-case in ConstraintInsetTarget and constraintOffsetTargetValue will be better?

[guzhenhuaGitHub]

replace if-else with switch-case in ConstraintInsetTarget and constraintOffsetTargetValue
before:

if let amount = self as? Float {
...
} else if let amount = self as? Double {
...

change to:

switch self {
case let amount as Float:
...
case let amount as Double:
...
}

will that seems to be better?