objective-c - Objective-C Passing Messages with Arguments in performSelectorOnMainThread:

Question

Need help with the syntax when the method being passed into @selector has arguments. Thanks!

//This works
dispatch_async(kBgQueue, ^{ 

 [self performSelectorOnMainThread:@selector(hydrateList) withObject:nil waitUntilDone:YES];   

});



//But what about when the method in the selector has arguments?
//This is incorrect, syntactically
  dispatch_async(kBgQueue, ^{ 

     [self performSelectorOnMainThread:@selector(hydrateListForCategory:self.categorySelected) withObject:nil waitUntilDone:YES];
  });

Answer 1

ヒント：「withObject：」の部分があるのはそのためです。

ヒント2：Appleには、フレームワークに関するかなり優れたドキュメントがあります。

ヒント3：

[self performSelectorOnMainThread:@selector(hydrateListForCategory:) withObject:self.categorySelected waitUntilDone:YES];

Answer 2

[self performSelectorOnMainThread:@selector(hydrateListForCategory:) withObject:self.categorySelected waitUntilDone:YES];