objective c - Declaring protocol like @class -


i have 2 protocols communicating each other. defined in same file. 

@protocol protocol1 <nsobject> -(void)setprotocoldelegate:(id<protocol2>)delegate; @end  @protocol protocol2 <nsobject> -(void)protocol:(uiviewcontroller<protocol1>*)anobject chosenelementatindex:(nsinteger)aindex; @end

how declare empty protocol protocol2 let know compiler declared later?

if protocol2 class i'd write @class protocol2; beforewards. 

@class protocol2; @protocol protocol1 <nsobject> -(void)setprotocoldelegate:(protocol2*)delegate; @end  @interface protocol2 <nsobject> -(void)protocol:(uiviewcontroller<protocol1>*)anobject chosenelementatindex:(nsinteger)aindex; @end

what similar construction protocols?

use @protocol protocols forward declaration:

@protocol protocol2; @protocol protocol1 <nsobject> -(void)setprotocoldelegate:(id<protocol2>)delegate; @end  @protocol protocol2 <nsobject> -(void)protocol:(uiviewcontroller<protocol1>*)anobject chosenelementatindex:(nsinteger)aindex; @end

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