ReactKitSwift 的响应式编程
ReactKit 是 Swift 的响应式编程。
示例代码：
// create signal via KVO
self.obj1Signal = KVO.signal(obj1, "value")
// bind signal via KVC (<~ as binding operator)
(obj2, "value") <~ self.obj1Signal
XCTAssertEqual(obj1.value, "initial")
XCTAssertEqual(obj2.value, "initial")
obj1.value = "REACT"
XCTAssertEqual(obj1.value, "REACT")
XCTAssertEqual(obj2.value, "REACT")
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