我在Reactive
Cocoa中将旧的Alamofire 2.0转换为3.0时遇到了很多麻烦.我在sendNext和sendCompleted调用中不断收到未知标识符错误.
@H_301_1@public final class Network: Networking {
private let queue = dispatch_queue_create( "Beet.BeetModel.Network.Queue",DISPATCH_QUEUE_SERIAL)
public init() { }
public func requestJSON(url: String,parameters: [String : AnyObject]?)
-> SignalProducer<AnyObject,NetworkError>
{
return SignalProducer { observer,disposable in
let serializer = Alamofire.Request.JSONResponseSerializer()
Alamofire.request(.GET,url,parameters: parameters)
.response(queue: self.queue,responseSerializer: serializer) {
_,_,result in
switch result {
case .Success(let value):
sendNext(observer,value)
sendCompleted(observer)
case .Failure(_,let error):
sendError(observer,NetworkError(error: error))
}
}
}
}
}
这个语法
changed in
4.0 alpha 2
. Observer现在是它自己的类型,所以旧函数sendNext,sendError等不再是自由函数:
@H_301_1@switch result {
case .Success(let value):
observer.sendNext(value)
observer.sendCompleted()
case .Failure(_,let error):
observer.sendError(NetworkError(error: error))
}
我要为您的解决方案添加的一件事是提供一次性使用,以便在需要时可以取消请求,以节省资源:
@H_301_1@return SignalProducer { observer,disposable in let serializer = Alamofire.Request.JSONResponseSerializer() let request = Alamofire.request(.GET,parameters: parameters) request.response(queue: self.queue,responseSerializer: serializer) { _,result in switch result { case .Success(let value): observer.sendNext(value) observer.sendCompleted() case .Failure(_,let error): observer.sendError(NetworkError(error: error)) } } disposable.addDisposable(request.cancel) }