Question

I got SO questions also same as this and I tried with solution but still its not working for mine so asked this again.

This is my VCWithProtocol.h

@protocol mydemoDelegate
@optional
-(void)demoDelegateMethodWithSuccess:(BOOL)yesOrNo;
@end

@interface VCWithProtocol : UIViewController 
{ 
   id<mydemoDelegate>mydelegate;
}
@property (nonatomic,assign)id<mydemoDelegate>mydelegate;

VCWithProtocol.m

`@synthesize mydelegate`

This is my class where I am trying to use my Delegate

@class VCWithProtocol;

@interface VCTOUseDelegate : UIViewController <mydemoDelegate> //here is where it shows error with cannot find protocol declaration

VCTOUseDelegate.m

VCWithProtocol *obj = [[VCWithProtocol alloc] init];
obj.mydelegate = self;

I tried with Importing VCWithProtocol but not working as well

Answer 1

Instead of @class VCWithProtocol; write #import VCWithProtocol.h

And some good practice Use capital letter for first character of any class name and protocol.
e.g. MyDemoDelegate and avoid retaining delegate use

@property (nonatomic,assign)id<mydemoDelegate>mydelegate;