KZSwiftBridging

This is a framework specifically focused on bridging NSValue/NSNumber types more smoothly between Objective-C and Swift and vis-versa.

There are four unique components:

Unifying NSNumber and NSValue conversion

All numeric types implement NSNumberWrappable and all common NSValue types implement NSValueWrappable.

public protocol NSNumberWrappable : NSValueWrappable {
    init(_ number: NSNumber)
    func toNSNumber() -> NSNumber
}

Additionally, inits have been added, especially handling the concept of nullable NSNumber -> optional Int

let nsnumber: NSNumber? = nil
if let intval = Int(nsnumber) {
  // ...
}

Note there's a Swift compiler issue which is why NSValue additions are slightly different.

##Treating NSDecimal as a first-class primitive NSDecimal is a 128-bit struct that represents a decimal number.

Whereas one might typically use NSDecimalNumber, I felt it was in the spirit of Swift to fix the struct by adding Equatable, Comparable, and SignedNumberType conformance, as well as arithmatic operators.

Now you should be able to work on larger decimal types without having to create a class.

##Better Objective-C automated bridging CGPoint, etc, and NSDecimal, now implement _ObjectiveCBridgeable. _ObjectiveCBridgeable is a somewhat obfuscated protocol that allows one to specify special conversion of non-Objective-C types to Objective-C. The primary use case here is to allow arrays, dictionaries, etc, to bridge appropriately.

##Typed key-value-observation additions to NSObject Combined with all the pieces above, we get better bridging, which allows generics to better type KVO. There are some new extensions on NSObject that allow a better, typed KVO experience.