block类属性

@property (copy) void (^finishedBlock)(NSDictionary *responseInfo);

@property (copy) void (^failure)(NSError *error);

- (void)requestWithFinished:(void (^)(NSDictionary *responseInfo))finished failure:(void (^)(NSError *error))failure {
    self.finishedBlock = finished;
    self.failureBlock = failure;
}


- (void)invokeFinishBlock {
self.finishedBlock(nil);
self.failure(nil);
}