iOS RXSwift 如何从 .success 结果中获取价值?

Question

在RXSwift中获取与.success Result关联的值的正确语法是什么？

.map{ (result : Result<Double>) -> Double in
//how to get duration from result? this does not work
let duration : Double = result.success.value
return duration
}

Answer 1

添加泛型扩展：

enum Result<T> {
case success(T)
case failure(Error)
}
extension Result {
var successResult: T? {
guard case let .success(value) = self else { return nil }
return value
}
}

有了上述方法，您可以做到：

result.successResult.map { duration in 
// do something with duration
}

Answer 2

Swift 中的 Result 有一个 get(( 函数，该函数以抛掷表达式的形式返回成功值。所以你可以这样称呼：

var successVal = try? result.get()