[Objective-C] プロトコル

LightMapDelegate.h

#import <Foundation/Foundation.h>

#import "MapDelegate.h"


@interface LightMapDelegate : NSObject <MapDelegate> {

}

@end

LightMapDelegate.m

#import "LightMapDelegate.h"


@implementation LightMapDelegate

-(int)getMaxZoomLevel {
	return 12;
}

@end

main.m

#import <UIKit/UIKit.h>

#import "Map.h"
#import "LightMapDelegate.h"

int main(int argc, char *argv[]) {
	id<MapDelegate> delegate = [[LightMapDelegate alloc] init];
	Map *map = [[Map alloc] initWithMapDelegate:delegate];
	NSString * maxLevelString = [map getMaxLevelString];
	NSLog(maxLevelString);
}

Map.h

#import <Foundation/Foundation.h>

#import "MapDelegate.h"


@interface Map : NSObject {
	id delegate;
}

@property(assign) id<MapDelegate> delegate;

-(id)initWithMapDelegate:(id <MapDelegate>)_delegate;

-(NSString *)getMaxLevelString;

@end

Map.m

#import "Map.h"
#import "MapDelegate.h"


@implementation Map

@synthesize delegate;

-(id)initWithMapDelegate:(id <MapDelegate>)_delegate {
	self = [super init];
	if (self != nil) {
		delegate = _delegate;		
	}
	return self;
}
-(NSString *)getMaxLevelString {
	int level = [delegate getMaxZoomLevel];
	NSString *ret = [NSString stringWithFormat:@"最大ズームレベルは%dです。", level];
	return ret;
}

@end

MapDelegate.h

#import <UIKit/UIKit.h>


@protocol MapDelegate

@required
-(int)getMaxZoomLevel;

@end