I am implementing an library(.a), and I want to send notification count from library to app so they can show in their UI, notification count. I want them to implement the only method like,
-(void)updateCount:(int)count{
NSLog(@"count *d", count);
}
How can I send the count from my library continuously so they can use it in updateCount method to show.
I searched and come to know about call back functions. I have no idea how to implement them. Is there any other way to do this.
You have 3 options
- Delegate
- Notification
- Block,also known callback
I think what you want is Delegate
Assume you have this file as lib
TestLib.h
#import <Foundation/Foundation.h>
@protocol TestLibDelegate<NSObject>
-(void)updateCount:(int)count;
@end
@interface TestLib : NSObject
@property(weak,nonatomic)id<TestLibDelegate> delegate;
-(void)startUpdatingCount;
@end
TestLib.m
#import "TestLib.h"
@implementation TestLib
-(void)startUpdatingCount{
int count = 0;//Create count
if ([self.delegate respondsToSelector:@selector(updateCount:)]) {
[self.delegate updateCount:count];
}
}
@end
Then in the class you want to use
#import "ViewController.h"
#import "TestLib.h"
@interface ViewController ()<TestLibDelegate>
@property (strong,nonatomic)TestLib * lib;
@end
@implementation ViewController
-(void)viewDidLoad{
self.lib = [[TestLib alloc] init];
self.lib.delegate = self;
[self.lib startUpdatingCount];
}
-(void)updateCount:(int)count{
NSLog(@"%d",count);
}
@end