Objective-C: Strategy Pattern, è principalmente per selettore?

Per usare il Pattern della strategia in Objective-C, penso che sia principalmente dal selector .

Per omettere if...else , utilizzare il runtime Objective-C, convertire la corrispondenza delle stringhe per selezionare il selettore (Strategia).

Ho capito bene?

Ecco la demo: Pattern di strategia in ResponderChain Communication Pattern.

crea un router per utilizzare la comunicazione ResponderChain

#import "UIResponder+Router.h"

@implementation UIResponder (Router)

- (void)routerEventWithName:(NSString *)eventName userInfo:(NSDictionary *)userInfo
{
    [[self nextResponder] routerEventWithName:eventName userInfo:userInfo];
}

@end

mittente dell'evento:

[self routerEventWithName:kBLGoodsDetailBottomBarEventTappedBuyButton userInfo:nil];

Ricevitore di eventi:

#pragma mark - event response
- (void)routerEventWithName:(NSString *)eventName userInfo:(NSDictionary *)userInfo
{

    /*
        do things you want
    */
    // call the upper ,by ResponderChain
    // [super routerEventWithName:eventName userInfo:userInfo];
}

Ecco la parte strategica:

quando le sorgenti di eventi sono molte, usa la strategia per specificare la situazione concreta.

#pragma mark - event response
- (void)routerEventWithName:(NSString *)eventName userInfo:(NSDictionary *)userInfo
{

    NSInvocation *invocation = self.eventStrategy[eventName];
    [invocation setArgument:&userInfo atIndex:2];
    [invocation invoke];

    // call the upper ,by ResponderChain
    // [super routerEventWithName:eventName userInfo:userInfo];
}

- (NSDictionary <NSString *, NSInvocation *> *)eventStrategy
{
    if (_eventStrategy == nil) {
        _eventStrategy = @{
                               kBLGoodsDetailTicketEvent:[self createInvocationWithSelector:@selector(ticketEvent:)],
                               kBLGoodsDetailPromotionEvent:[self createInvocationWithSelector:@selector(promotionEvent:)],
                               kBLGoodsDetailScoreEvent:[self createInvocationWithSelector:@selector(scoreEvent:)],
                               kBLGoodsDetailTargetAddressEvent:[self createInvocationWithSelector:@selector(targetAddressEvent:)],
                               kBLGoodsDetailServiceEvent:[self createInvocationWithSelector:@selector(serviceEvent:)],
                               kBLGoodsDetailSKUSelectionEvent:[self createInvocationWithSelector:@selector(skuSelectionEvent:)],
                               };
    }
    return _eventStrategy;
}