ProprtyType 的文本字段值与 Reactive Cocoa 4

Question

我正在尝试将文本字段内容映射到 ProprtyType。我在视图模型中有属性：

var property = MutableProperty<Int?> (nil)

我想把它绑定在viewDidLoad

let producer = textField.rac_textSignal().toSignalProducer().map { text in Int(text as! String) }
viewModel.property <~ producer

但我收到我不理解的错误：

Binary operator '<~' cannot be applied to operands of type 'MutableProperty' (aka 'MutableProperty>') and 'SignalProducer' (aka 'SignalProducer, NSError>')

我做错了什么？

Answer 1

因为绑定操作符<~要求信号产生者的错误类型必须是NoError。所以使用 flatMapError:

捕获任何错误

let producer = textField.rac_textSignal().toSignalProducer()
    .flatMapError { error in
        return SignalProducer<AnyObject?, NoError>.empty
    }
    .map { text in Int(text as! String) }

property <~ producer

ProprtyType 的文本字段值与 Reactive Cocoa 4

Text field value to ProprtyType with Reactive Cocoa 4

uitextfield

ios

reactive-cocoa

swift