iOS
멀티 캐스트 위임자

소개

모든 컨트롤에 대한 멀티 캐스트 대리자

위임자가 하나의 객체를 다른 객체로 전달하여 이러한 메시지를 여러 관찰자에게 멀티 캐스팅합니다.

1 단계 : - RRMulticastDelegate NSObject 클래스 만들기

2 단계 : RRMulticastDelegate.h 파일의 다음 코드 구현

#import <Foundation/Foundation.h>

@interface RRMulticastDelegate : NSObject

{
    //Handle multiple observers of delegate
    NSMutableArray* _delegates;
}

// Delegate method implementation to the list of observers
- (void)addDelegate:(id)delegate;
- (void)removeDelegate:(id)delegate;

// Get multiple delegates
-(NSArray *)delegatesObjects;

@end

3 단계 : - RRMulticastDelegate.m 파일의 다음 코드 구현

#import "RRMulticastDelegate.h"

@implementation RRMulticastDelegate

- (id)init
{
    if (self = [super init])
    {
        _delegates = [NSMutableArray array];
    }
    return self;
}

-(NSArray *)delegatesObjects
{
    return _delegates;
}

- (void)removeDelegate:(id)delegate
{
    if ([_delegates containsObject:delegate])
        [_delegates removeObject:delegate];
}

- (void)addDelegate:(id)delegate
{
    if (![_delegates containsObject:delegate])
        [_delegates addObject:delegate];
}

- (BOOL)respondsToSelector:(SEL)aSelector
{
    if ([super respondsToSelector:aSelector])
        return YES;
    
    // if any of the delegates respond to this selector, return YES
    for(id delegate in _delegates)
    {
        if (!delegate)
            continue;
        
        if ([delegate respondsToSelector:aSelector])
        {
            return YES;
        }
    }
    return NO;
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
    // can this class create the sinature?
    NSMethodSignature* signature = [super methodSignatureForSelector:aSelector];
    
    // if not, try our delegates
    if (!signature)
    {
        for(id delegate in _delegates)
        {
            if (!delegate)
                continue;
            
            if ([delegate respondsToSelector:aSelector])
            {
                return [delegate methodSignatureForSelector:aSelector];
            }
        }
    }
    return signature;
}

- (void)forwardInvocation:(NSInvocation *)anInvocation
{
    // forward the invocation to every delegate
    for(id delegate in _delegates)
    {
        if (!delegate)
            continue;
        
        if ([delegate respondsToSelector:[anInvocation selector]])
        {
            [anInvocation invokeWithTarget:delegate];
        }
    }
}

@end

4 단계 : - RRProperty NSObject 카테고리 클래스 생성

5 단계 : - NSObject+RRProperty.h 파일의 다음 코드 구현

#import <Foundation/Foundation.h>

#import "RRMulticastDelegate.h"

@interface NSObject (RRProperty)<UITextFieldDelegate,UITableViewDataSource>

-(void)setObject:(id)block forKey:(NSString *)key;
-(id)objectForKey:(NSString *)key;

#pragma mark - Multicast Delegate

- (RRMulticastDelegate *)multicastDelegate;
- (RRMulticastDelegate *)multicastDatasource;

-(void)addDelegate:(id)delegate;
-(void)addDataSource:(id)datasource;

@end

6 단계 : NSObject+RRProperty.m 파일의 다음 코드 구현

#import "NSObject+RRProperty.h"

#import <objc/message.h>
#import <objc/runtime.h>

#pragma GCC diagnostic ignored "-Wprotocol"

static NSString *const MULTICASTDELEGATE = @"MULTICASTDELEGATE";
static NSString *const MULTICASTDATASOURCE = @"MULTICASTDATASOURCE";

@implementation NSObject (RRProperty)

-(void)setObject:(id)block forKey:(NSString *)key
{
    objc_setAssociatedObject(self, (__bridge const void *)(key), block, OBJC_ASSOCIATION_RETAIN);
}

-(id)objectForKey:(NSString *)key
{
    return objc_getAssociatedObject(self, (__bridge const void *)(key));
}

#pragma mark - Multicast Delegate

- (RRMulticastDelegate *)multicastDelegate
{
    id multicastDelegate = [self objectForKey:MULTICASTDELEGATE];
    if (multicastDelegate == nil) {
        multicastDelegate = [[RRMulticastDelegate alloc] init];
        
        [self setObject:multicastDelegate forKey:MULTICASTDELEGATE];
    }
    
    return multicastDelegate;
}

- (RRMulticastDelegate *)multicastDatasource
{
    id multicastDatasource = [self objectForKey:MULTICASTDATASOURCE];
    if (multicastDatasource == nil) {
        multicastDatasource = [[RRMulticastDelegate alloc] init];
        
        [self setObject:multicastDatasource forKey:MULTICASTDATASOURCE];
    }
    
    return multicastDatasource;
}

-(void)addDelegate:(id)delegate
{
    [self.multicastDelegate addDelegate:delegate];
    
    UITextField *text = (UITextField *) self;
    text.delegate = self.multicastDelegate;
}

-(void)addDataSource:(id)datasource
{
    [self.multicastDatasource addDelegate:datasource];
    UITableView *text = (UITableView *) self;
    text.dataSource = self.multicastDatasource;
}

@end

마지막으로 당신은 어떤 컨트롤에 대해서도 멀티 캐스트 dalegate를 사용할 수 있습니다 ...

예전 들어 ...

NSObject+RRProperty.h 파일에서 viewcontroller 클래스를 가져 NSObject+RRProperty.h 멀티 캐스트 위임 / 데이터 소스 를 설정 하는 메소드에 액세스하십시오.

UITextView *txtView = [[UITextView alloc]initWithFrame:txtframe];
[txtView addDelegate:self];
    
UITableView *tblView = [[UITableView alloc]initWithFrame:tblframe];
[tblView addDelegate:self];
[tblView addDataSource:self];