Question

@interface Server : NSObject {
    id<ServerDelegate> _delegate;
    NSInputStream *_inputStream;
    NSOutputStream *_outputStream;
}

@property(nonatomic, assign) id<ServerDelegate> delegate;

Whenever I set the delegate of the input or output streams I get a warning that it’s assigning to id from incompatible type Server*.

self.inputStream.delegate = self is an example of this.

The actual server runs fine it’s just the warning that concerns me.

Answer 1

If you want to assign self (Server obejct) as the delegate of NSInputStream, your Server object must conform to the NSStreamDelegate protocol.

Since NSInputStream is a subclass of NSStream

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSStream_Class/Reference/Reference.html#//apple_ref/occ/cl/NSStream

@interface Server : NSObject<NSStreamDelegate> 
[...]
@end