ios - 如何使用ReactiveKit将本地镜像绑定(bind)到 ImageView ？

Question

为了从服务器获取图像，我已经这样做了

// fetch image from server
    func fetchImage(url: NSURL) -> Operation<UIImage, NSError> {
        return Operation { observer in

            // use almofire to deal with server request
            let request = Alamofire.request(.GET, url).response { request, response, data, error in

                // if error occurs then abort the operation
                if let error = error {
                    observer.failure(error)
                } else {
                    // if doesnt occurs error then convert imageData back to image
                    if(data != nil)
                    {
                        observer.next(UIImage(data : data!)!)
                        observer.success()
                    }
                }
            }

            // if response is nil then execute this block
            return BlockDisposable {
                request.cancel()
            }
        }

    }

然后将其绑定(bind)到 ImageView

if (url != nil)
        {
            let image : ObservableBuffer<UIImage>? = self.fetchImage(url!).shareNext()

            if ((image) != nil)
            {

                image!.bindTo(customCellObj.mContentCellImageView)
            }
        }

这里我使用 almofire 从 url 获取图像。有什么方法可以直接使用 react 套件将本地数据库图像与 ImageView 绑定(bind)？

Answer 1

以下是将 imageView 连接到流的方法:

    Stream.just(NSURL(string: "https://exoticcars.enterprise.com/etc/designs/exotics/clientlibs/dist/img/homepage/Homepage-Hero-Car.png")!)
        .flatMapLatest(fetchImage)
        .flatMapError { _ in return Stream.just(UIImage()) }
        .observeNext { [weak self] image in self?.imageView.image = image }
        .disposeIn(bag)

然而，冒着听起来太明显的风险……这就是 ReactiveUIKit 的用途。

    Stream.just(NSURL(string: "https://exoticcars.enterprise.com/etc/designs/exotics/clientlibs/dist/img/homepage/Homepage-Hero-Car.png")!)
        .flatMapLatest(fetchImage)
        .flatMapError { _ in return Stream.just(UIImage()) }
        .bindTo(imageView.rImage)
        .disposeIn(bag)

还有一个 ReactiveKit 的 Alamofire 扩展 (AlamofireReactive)，您可能会发现它很有用。