给 Swift 写 Event Emitter，有什么优雅的方法吗？

听上去是redis swift client?

@hewigovens 是的，封装了 Hiredis，已经被 C 指针玩死了 Swift 把 char[] 当 tuple 处理你造吗……

@hewigovens 目标是用 Swift 写服务器端代码，我想类似模板引擎这样的东西反正也能用 JavaScriptCore 解决（虽然不兼容 CommonJS 但比重写好多了……吧！），于是就去试试。

没有类型系统的日子我已经受！够！了！

不过说实话，发 iDev 不合适……不过估计这里的人对 Swift 最熟了。

class EEProto {
var A: Int
var B: Double

typealias EventChangeA = (Int, Int) -> Void
typealias EventChangeB = (Double, Double) -> Void
typealias EventChanged = () -> Void

struct RegisteredEvent {
var eventChangeA: EventChangeA[]
var eventChangeB: EventChangeB[]
var eventChanged: EventChanged[]
}

enum EventType {
case changeA(EventChangeA[])
case changeB(EventChangeB[])
case changed(EventChanged[])
}

var registeredEvents: RegisteredEvent

init (A: Int, B: Double) {
self.A = A
self.B = B
registeredEvents = RegisteredEvent(eventChangeA: [], eventChangeB: [], eventChanged: [])
}

func on (event: EventType) {
switch event {
case .changeA(let events):
registeredEvents.eventChangeA += events
case .changeB(let events):
registeredEvents.eventChangeB += events
case .changed(let events):
registeredEvents.eventChanged += events
default:
assert("unhandled event type | check your code")
break
}
}

func resetEvents (eventType: EventType) {
switch eventType {
case .changeA:
registeredEvents.eventChangeA = []
case .changeB:
registeredEvents.eventChangeA = []
case .changed:
registeredEvents.eventChangeA = []
default:
assert("unhandled event type | check your code")
break
}
}

func setA (newA: Int) {
let oldA = A
A = newA
for cb in registeredEvents.eventChangeA {
cb(oldA, newA)
}
for cb in registeredEvents.eventChanged {
cb()
}
}

func setB (newB: Double) {
let oldB = B
B = newB
for cb in registeredEvents.eventChangeB {
cb(oldB, newB)
}
for cb in registeredEvents.eventChanged {
cb()
}
}
}

var inst = EEProto(A: 10, B: 5.5)
inst.on(EEProto.EventType.changeA([{
println("from \($0) to \($1)")
}]))
inst.on(EEProto.EventType.changeB([{
println("from \($0) to \($1)")
}]))
inst.on(EEProto.EventType.changed([{
println("value changed")
}]))

inst.setA(10)
inst.setB(3.14)

好冗余………………丑爆了。