如何在RxSwift中观察对象的属性？
如何在RxSwift中观察对象的属性？
提问于 2018-06-23 19:08:39
我有以下Forecast类：
class Forecast {
let city: City
var currentTemperature: String {
didSet {
print("cur tepm was set to \(currentTemperature)")
}
}
init(city: City) {
self.city = city
self.currentTemperature = "0"
}
func loadForecast() {
self.currentTemperature = "+10"
}
}我试图在currentTemperature中观察forecast对象的ForecastViewModel属性。
class ForecastViewModel {
fileprivate let variableForecast: Variable<Forecast>
var navigationTitle: Observable<String> {
return Observable.just("No name")
}
init(forecast aForecast: Forecast) {
self.variableForecast = Variable(aForecast)
self.variableForecast.asObservable().subscribe(onNext: { (s) in
print(s.currentTemperature)
})
variableForecast.value.currentTemperature = "-15"
variableForecast.value.loadForecast()
}
}但是，subscribe中的代码只执行一次并打印0。每次都调用didSet块。
我应该如何观察这个类的属性？
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-23 19:38:16
实际上，您应该将currentTemperature声明为Variable，以观察值的变化。你的Forecast会变成这样
class Forecast {
let city: City
var currentTemperature: Variable<String> = Variable("0")
init(city: City) {
self.city = city
}
func loadForecast() {
self.currentTemperature.value = "+10"
}
}现在您可以订阅currentTemperature中的更改，如下所示，
class ForecastViewModel {
fileprivate let variableForecast: Variable<Forecast>
var navigationTitle: Observable<String> {
return Observable.just("No name")
}
init(forecast aForecast: Forecast) {
self.variableForecast = Variable(aForecast)
self.variableForecast.value.currentTemperature.asObservable().subscribe(onNext: { (value) in
print(value)
})
variableForecast.value.currentTemperature.value = "-15"
variableForecast.value.loadForecast()
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51004283
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