如何通过NSURLConnection sendAsynchronousRequest取消异步调用？

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我有一个Web服务调用实时对用户输入执行一些验证。我想在验证上使用 [NSURLConnection sendAsynchronousRequest] （在iOS 5中引入），但如果用户同时更改输入字段内容，则取消它。取消当前请求的最佳方法是什么？

I've got a web service call performing some validation on user input in real time. I'd like to use [NSURLConnection sendAsynchronousRequest] on the validation (which was introduced in iOS 5), but cancel it if the user changes the input field content in the mean time. What is the best way to cancel a current request?

推荐答案

似乎没有一种好方法可以做到这一点。解决方案似乎是在您需要取消请求的情况下不使用新的 [NSURLConnection sendAsynchronousRequest] 。

It doesn't appear that there is a good way to do this. The solution seems to be to not use the new [NSURLConnection sendAsynchronousRequest] in situations in which you need to cancel the request.