使用 RestKit 从 NSURL 异步加载图像

问题描述

RestKit 中是否有包装器或某种内置功能可以使用回调或异步方式从 NSURL 加载 UIImage块?我在 RestKit 文档中找不到这样的方法.如果没有，从 NSURL 使用 RestKit 尽可能实现延迟加载异步图像的好策略是什么?

Is there a wrapper or some sort of built-in functionality available in RestKit to load a UIImage from an NSURL asynchronously using callbacks or blocks? I could not find such a method in the RestKit docs. If there is not, what is a good strategy for implementing lazy loaded async images from NSURL using RestKit as much as possible?

推荐答案

使用RestKit你可以使用RKRequest来为图片加载数据，例如:

Using RestKit you can use RKRequest to load the data for the image in a manner such as:

RKRequest* request = [RKRequest requestWithURL: url];

request.onDidLoadResponse = ^(RKResponse* response) {
    UIImage* image = [UIImage imageWithData: response.body];
    // do something interesting with the image
};

request.onDidFailLoadWithError = ^(NSError* error) {
    // handle failure to load image
}

[imageLoadingQueue addRequest: request];

请注意，即使在 onDidLoadResponse 情况下，您也可能需要检查 response 以确保数据类型符合您的预期.上面使用的图片加载队列可以这样创建:

Note that even in the onDidLoadResponse case you may want to check response to make sure the type of data is what you expected. The image loading queue used above can be created like so:

imageLoadingQueue = [RKRequestQueue requestQueueWithName: @"imageLoadingQueue"];
[imageLoadingQueue start];

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