ReactiveCocoa6.0的开发指北

来源：互联网发布：淘宝近期的促销活动编辑：程序博客网时间：2024/06/05 01:52

最新的ReactiveCocoa使用网上能找到的资料特别少，为了给接入swift版reactivecocoa的开发者提供便利，我就讲常用场景下的使用，就拿注册页面来举例，如有异议和问题欢迎指正交流，言归正传，注册页面一般由一些信息需要用户填写，一般我们用UITableView展示，UITableView的使用我就不提了，上代码

fileprivate let verifyCode = MutableProperty<String>("")....func verifyCodeCell(at indexPath: IndexPath) -> UITableViewCell {        let cell = tableView.dequeueReusableCell(withIdentifier: "verify_cell", for: indexPath) as! ABVerifyCodeCell        self.verifyButton = cell.verifyCodeButton        // import Then         return cell.with {            $0.textField.reactive.text <~ self.verifyCode.producer.take(until: cell.reactive.prepareForReuse)            $0.textField.reactive                .continuousTextValues                .take(until: cell.reactive.prepareForReuse)                .map { $0 ?? "" }                .observeValues{ [weak self] in                    self?.verifyCode.value = String($0.characters.prefix(6))            }            $0.verifyCodeButton.reactive                .controlEvents(.touchUpInside)                .take(until: cell.reactive.prepareForReuse)                .observeValues { [weak self] _ in                    self?.getVerifyCode()                }        }    }

由于cell重用问题，textField内容绑定必须调用以下方法来实现重用时解除之前的绑定

$0.textField.reactive.text <~ self.verifyCode.producer.take(until: cell.reactive.prepareForReuse)

以下代码用来限制输入的字符数，开发者也可以再次限制输入的内容，如手机号码校验等

.observeValues{ [weak self] in                    self?.verifyCode.value = String($0.characters.prefix(6))            }

一切尽在代码中，文笔太差就不多废话了

在需要多个请求都返回时才处理后续流程这种情况下，如果不使用ReactiveCocoa，需要保留很多状态
使用ReactiveCocoa就简单多了，贴代码

func requestPropertyValue() -> SignalProducer<PropertyValueModel, RequestError> {        return SignalProducer { (observer, lifeTime) in            let params = ["module" : PropertyValueService.ModuleProperty.prod.rawValue]            let requestTask = PropertyValueService()                .request(                    params,                    transform: {                        var result = [String : String]()                        $0["data"].arrayValue.forEach {                            result[$0["mappingName"].stringValue] = $0["propName"].stringValue                        }                        return PropertyValueModel(propMap: result)                    },                    completionHandler: {                        if $0.isSuccess {                            observer.send(value: $0.value!)                            observer.sendCompleted()                        } else {                            observer.send(error: $0.error as! RequestError)                        }                })            lifeTime += AnyDisposable {                requestTask?.cancel()            }        }    }    func requestProductCustomerNo() -> SignalProducer<String, NoError> {        return SignalProducer { observer, _ in            ProductNoService()                .request(                    nil,                    transform: { $0["prodCustomNo"].stringValue },                    completionHandler: {                        observer.send(value: $0.isSuccess ? $0.value! : "")                        observer.sendCompleted()                })        }    }    func requestCustomerNoAndPropertyValue() {        let customerNoProducer = requestProductCustomerNo().promoteError(RequestError.self)        let propProducer = requestPropertyValue()        customerNoProducer            .combineLatest(with: propProducer)            .observe(on: UIScheduler())            .on(starting: { [weak self] _ in                if let strongSelf = self {                    strongSelf.showLoadingOnView(strongSelf.view)                }            })            .startWithSignal { signal, _ in                signal.observeResult { [weak self] result in                    if let strongSelf = self {                        strongSelf.hideLoadingForView(strongSelf.view)                        if let value = result.value {                            strongSelf.customNo.value = value.0                            strongSelf.generatedProdNo = value.0                            strongSelf.tableView.reloadData()                        }                    }                }            }    }

combineLatest函数使多个信号都响应时才通知，不需要保留任何临时状态就优雅的解决了这种问题

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