SwiftEvent是iOS上Swift简单的事件机制。
没有参数的事件示例：
var event = Event()event.on() { print("regular listener")}event.once() { print("one time listener")}event.emit()event.emit()一个参数：
var counter = 0var event = EventWith<Int>()event.on() { counter += $0}event.once() { counter += $0}event.emitWith(1)两个参数
var counter = 0var string = ''var event = EventDue<Int, String>()event.on() { (value, word) in counter += value string += word}event.emitWith(1, and: 'Hello ')event.emitWith(1, and: 'World')多个参数
var text = ''var event = EventWith<[String]>()event.on() { (words) in text += " ".join(words)}event.emitWith(['Hello', 'World', '!!!'])
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