問題描述
可以指定一個 NSObject 作為多個 ASIHTTPRequests 的代表嗎？ (OK to assign one NSObject as the delegate of multiple ASIHTTPRequests?)
Is it OK to assign one NSObject as the delegate of multiple, asynchronous ASIHTTPRequests?
My concern is that two or more requests will call the same callback method on the delegate at the same time.
I checked that ASIHTTPRequest calls the delegate callbacks on the main thread, just as NSURLConnection does. So, it's OK, right?
參考解法
方法 1:
Yes, this is fine, normal, and part of the design of delegates.
方法 2:
Yes, this is a perfectly normal thing to do. Properly designed APIs should pass the calling object as a parameter of any delegate methods. This way, an object acting as a delegate can (if necessary) distinguish its delegate responsibilities by delegating object instance.
(by ma11hew28、Rob Napier、Barry Wark)