CODEWITHSUNDEEP
iosobjective-cdelegates
Midhun MP
Midhun MP

Reputation: 107211

Checking and Calling methods on delegate classes without importing the header file

Currently I'm working on an iOS application in which I'm using delegates and I implemented something like:

@protocol Hello <NSObject>

@required
- (void)update:(NSDictionary *)data;
@end


@interface NotificationHandler : NSObject
{
    id <Hello>delegate;
}
- (void)sendData;
@end

When some specific notification occurs it will call the sendData method and it'll call the update method of delegate.

Everything is working fine. In the dictionary I need to pass specific values for some special delegates. So I'm importing the headers like:

#import "Special1.h"
#import "Special2.h"

- (void)sendData
{
   if([_delegate isKindOfClass:[Special1 class]])
   {
      //special class 1
      NSDictionary *dict = //initialize with parameters and values
      [(Special1 *)_delegate update:dict];
   }
   else if([_delegate isKindOfClass:[Special2 class]])
   {
      //special class 2
       NSDictionary *dict = //initialize with parameters and values
      [(Special2 *)_delegate update:dict];
   }
}

Here the issue is, I need to import all the special classes here. Is there anyway to do this without importing the class ?

Upvotes: 1

Views: 1045

Answers (1)

Midhun MP
Midhun MP

Reputation: 107211

I found a solution using NSClassFromString like:

- (void)sendData
{
   if([_delegate isKindOfClass:NSClassFromString(@"Special1")])
   {
      //special class 1
      NSDictionary *dict = //initialize with parameters and values
      [_delegate performSelector:@selector(update:) withObject:dict];
   }
   else if([_delegate isKindOfClass:NSClassFromString(@"Special2")])
   {
      //special class 2
      NSDictionary *dict = //initialize with parameters and values
      [_delegate performSelector:@selector(update:) withObject:dict];
   }
}

Upvotes: 1

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