Question

我正在运行一个类方法，它有一个带有我想要返回的对象的完成块。但是，当我返回值时，属性都在那里，但调试器说该对象是（null）尽管在查看更多细节时有一个内存地址。有谁知道这是怎么可能的。谢谢！

我还在我的调试区域附加了一个图像，其中显示了（null）

+ (void)getBoard:(NSInteger)boardId withUser:(User *)user completion:(void (^)(Board *board))compBoard {
    NSDictionary* headers = @{@"Accept": @"application/json", @"Authorization": [NSString stringWithFormat:@"Bearer %@", user._token]};
    [[UNIRest get:^(UNISimpleRequest *request) {
        [request setUrl:[NSString stringWithFormat:@"%@/boards/%zd", REST_URL, boardId]];
        [request setHeaders:headers];
    }] asJsonAsync:^(UNIHTTPJsonResponse *jsonResponse, NSError *error) {
        NSDictionary* json = [NSJSONSerialization JSONObjectWithData:[jsonResponse rawBody] options:kNilOptions error:&error];
        NSLog(@"Response status of boards: %ld\n%@", (long) jsonResponse.code, json);
        if ( jsonResponse.code >= 200 && jsonResponse.code <= 300 ) {
            NSDictionary *boardDict = [NSJSONSerialization JSONObjectWithData:[jsonResponse rawBody] options:kNilOptions error:&error];

            Board *board = [[Board alloc] init];

            board._courseId = [[boardDict objectForKey:@"courseId"] integerValue];
            board._udid = [[boardDict objectForKey:@"boardId"] integerValue];
            board._boardName = [boardDict objectForKey:@"name"];
            NSDate *dateModified = [NSDate convertFromStringFromRemote:[boardDict objectForKey:@"lastModified"]];
            board._dateModified = dateModified;
            NSDate *dateCreated = [NSDate convertFromStringFromRemote:[boardDict objectForKey:@"createdDate"]];
            board._dateCreated = dateCreated;

            compBoard(board);
        }
    }];
}

我称之为

- (void)addBoardWithNotification:(NSNumber *)entityId {
    __weak typeof(self) weakSelf = self;

    [CourseViewModal getBoard:[entityId integerValue] withUser:weakSelf._currentUser completion:^(Board *board) {
    Course *boardCourse = [weakSelf._currentUser getCourseForId:board._courseId];

        dispatch_async(dispatch_get_main_queue(), ^{
            if ( ![boardCourse doesBoardNameExist:board._boardName] ) {
                [boardCourse._boards addObject:board];
                [self._currentUser addBoard:board toCourseId:boardCourse._udid];

                NSNotification *addBoardNotification = [NSNotification notificationWithName:AddBoardNotificationString object:self userInfo:@{@"BoardObject" : board}];
                [[NSNotificationCenter defaultCenter] postNotification:addBoardNotification];
            }
        });
    }];
}

Answer 1

我尝试过您正在使用的代码流，看不到您正在使用的块设置中的任何问题 - 看起来您还有其他部分代码正在创建问题。

测试代码 - 没有问题

+(void) get:(myCompletion) compblock asJsonAsync:(myCompletion) compblock2{
    //do stuff

    compblock(nil);

    NSDictionary *ret2 = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObject:@"compblock2"] forKeys:[NSArray arrayWithObject:@"Key"]];
    compblock2(ret2);
}
+(void) myMethod:(myCompletion) compblock {
    //do stuff

    [ViewController get:^(NSDictionary* finished) {
        if(finished){
            NSLog(@"compblock %@",[finished objectForKey:@"Key"]);
        }

        compblock(finished);



    } asJsonAsync:^(NSDictionary* finished) {
        if(finished){
            NSLog(@"compblock2 %@",[finished objectForKey:@"Key"]);
        }

        NSDictionary *ret = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObject:@"compblock2"] forKeys:[NSArray arrayWithObject:@"Key"]];

        compblock(ret);

    }];

}


//call
    [ViewController myMethod:^(NSDictionary* finished) {
        if(finished){
            NSLog(@"success %@",[finished objectForKey:@"Key"]);
        }else {
            NSLog(@"nil");
        }
    }];

您可以查看以下代码吗？

+ (void)getBoard:(NSInteger)boardId withUser:(User *)user completion:(void (^)(Board *board))compBoard {
    NSDictionary* headers = @{@"Accept": @"application/json", @"Authorization": [NSString stringWithFormat:@"Bearer %@", user._token]};
    [[UNIRest get:^(UNISimpleRequest *request) {
        [request setUrl:[NSString stringWithFormat:@"%@/boards/%zd", REST_URL, boardId]];
        [request setHeaders:headers];
    }] asJsonAsync:^(UNIHTTPJsonResponse *jsonResponse, NSError *error) {
           Board *board = [[Board alloc] init];
           compBoard(board);
    }];
}

iOS完成块返回（null）

1 个答案: