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Observable.from(commands)
.merge()
.scan(CalculatorState.CLEAR_STATE) { a, x in
return a.tranformState(x)
}
.debug("debugging")
.subscribe(onNext: { [weak self] calState in
self?.resultLabel.text = calState.inScreen
switch calState.action {
case .operation(let operation):
switch operation {
case .addition:
self?.lastSignLabel.text = "+"
case .subtraction:
self?.lastSignLabel.text = "-"
case .multiplication:
self?.lastSignLabel.text = "x"
case .division:
self?.lastSignLabel.text = "/"
}
default:
self?.lastSignLabel.text = ""
}
})
.addDisposableTo(disposeBag)
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