问当我使用“弱化”时，我必须使用__block吗？

EN

#import "HotspotsService.h"
#import "Constants.h"
#import "Restkit.h"
#import "Hotspot.h"
#import <EXTScope.h>

@interface HotspotsService()
@property (nonatomic,strong) RKObjectManager *objectManager;
@property (nonatomic,strong) RKObjectRequestOperation *hotspotsOperation;
@end

@implementation HotspotsService

-(id) init {
    self=[super init];
    if (self) {
        // restkit
        // mapping
        // response
    }
    return self;
}

-(void) hotspotsWithRadius:(NSUInteger)rad center:(CLLocationCoordinate2D)coordinate onSuccess:(void(^)(NSArray *hotspots))success onFailure:(void(^)(NSError *error))fail {
    [self cancelHotspotsRequest];
    NSDictionary *params = // params
    self.hotspotsOperation = [self.objectManager appropriateObjectRequestOperationWithObject:nil method:RKRequestMethodGET path:kSolrPath parameters:params];
    @weakify(self);
    [self.hotspotsOperation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        @strongify(self);
        self.hotspotsOperation=nil;
        success(mappingResult.array);
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        @strongify(self);
        self.hotspotsOperation=nil;
        fail(error);
    }];
    [self.objectManager enqueueObjectRequestOperation:self.hotspotsOperation];
}

-(void) cancelHotspotsRequest {
    [self.hotspotsOperation cancel];
    self.hotspotsOperation=nil;
}

@end