在 RxSwift 中快速使用未解析的标识符 `create`

Question

我开始学习 Swift 并且我正在实现一个 Observable(使用 RxSwift)以在 OSX 应用程序中通过 AlamoFire 简化网络调用。

导入:

import RxSwift
import RxCocoa
import Alamofire

方法:

下面的创建标识符正在报告:使用未解析的标识符 create

func getAPI(body: String) -> Observable<AnyObject?> {
    return create { observer in
        let request = AlamoFireXMLPostRequest(body)
            .responseData(completionHandler: { request, response, data, error in
                if ((error) != nil) {
                    observer.on(.Error(error!))
                } else {
                    observer.on(.Next(getXMLfromFreshbooksResponse(response)))
                    observer.on(.Completed)
                }
            })
        return AnonymousDisposable {
            request.cancel()
        }
    }
}

CocoaPods:

# Uncomment this line to define a global platform for your project
# platform :ios, '9.0'
# Needed by SWXMLHash
source 'https://github.com/CocoaPods/Specs.git'
platform :osx, '10.10'

target 'Tractor Beam' do
  # Comment this line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!

  # Pods for Tractor Beam
  pod 'Alamofire', '~> 3.4'

  # Convert HTTP AF Responses to XML    
  pod 'AlamofireXmlToObjects'
  pod 'SWXMLHash', '~> 2.5.0'

  # Rx
  pod 'RxSwift', '~> 2.6.0'
  pod 'RxCocoa', '~> 2.6.0'

  target 'Tractor BeamTests' do
    inherit! :search_paths
    # Pods for testing
  end

  target 'Tractor BeamUITests' do
    inherit! :search_paths
    # Pods for testing
  end

end

#post_install do |installer|
#    installer.pods_project.targets.each do |target|
#        target.build_configurations.each do |config|
#            config.build_settings['SWIFT_VERSION'] = '3.0'
#            config.build_settings['MACOSX_DEPLOYMENT_TARGET'] = '10.10'
#        end
#    end
#end

Answer 1

create 是 Observable 类的静态方法。因此，您需要通过以下方式调用它，例如:Observable.create...

此外，您应该避免无故使用 ! 运算符。例如:

if ((error) != nil) {
    observer.on(.Error(error!))
}

应该写成:

if let error = error {
    observe.on(.Error(error))
}