从加载图像NSURL与异步RestKit [英] Load images from NSURL async with RestKit

问题描述

有一个包装或者从某种内置可用的功能 RestKit 来加载的UIImage 的 NSURL 使用异步回调或阻止？我找不到在 RestKit 文档这样的方法。如果没有，什么是从 NSURL 实施延迟加载异步图像的使用的 RestKit 尽可能？

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可以使用 RKRequest 加载数据的方式，如图片：

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，你可能要检查响应，以确保数据的类型你所期望的。上面使用的图像加载队列可以像这样创建：

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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