Using Swift delegate

Question

I am writing a subclass for NSOperation with swift. However, I met a strange problem.

 class Downloader : NSOperation, NSURLSessionDelegate,    NSURLSessionDownloadDelegate{}

When I add "NSURLSessionDownloadDelegate", it will show an error:"Type 'Downloader'does not conform to protocol 'NSURLSessionDownloadDelegate' " When I delete it, every thing is Ok. Do you know WHY? Thanks, advance!

You need to implement the methods marked as required in NSURLSessionDownloadDelegate — Cristik
– Cristik, Commented Jan 18, 2016 at 7:15

rookieCoder · Accepted Answer · 2016-01-18 07:16:49Z

1

According to apple docs https://developer.apple.com/library/prerelease/ios/documentation/Foundation/Reference/NSURLSessionDownloadDelegate_protocol/index.html

implementing URLSession:downloadTask:didFinishDownloadingToURL: is necessary,

Please make sure that you have implemented it.

answered Jan 18, 2016 at 7:16

rookieCoder

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I am Sophia Over a year ago

Yeah, It's true. Before I use Object-C, if I don't implement the method, It has no error before compile. Swift is different from Objcet-C. Thanks!

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