如何使用ReactiveKit将本地图像绑定到图像视图？

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()
            }
        }

    }

然后将其绑定到图像视图

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

            if ((image) != nil)
            {

                image!.bindTo(customCellObj.mContentCellImageView)
            }
        }

在这里，我使用almofire从url获取图像。 有什么方法可以使用反应套件直接将本地数据库映像与映像视图绑定？

Answer 1

这是将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)

但是，听起来似乎太过冒险了……这就是ReactiveUIKit的目的。

    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)

另外，您还可以找到ReactiveKit的Alamofire扩展（AlamofireReactive）。