如何将数据从一个实体传递到另一个实体类？

Posted 2023-03-16

【中文标题】如何将数据从一个实体传递到另一个实体类？

【英文标题】：how to pass data from one entity to other entity class?

【发布时间】：2013-04-01 06:59:34

【问题描述】：

我正在获取我的 chapterDC 类中的所有章节并获取区域，我在我的 chapterDC 类中有一个 selectedRegion 的属性，并希望通过 chapterDC 将我的区域数据传递到 regionDC，但我的日志消息始终为 0 且为空，我不知道自己做错了什么

-(NSMutableArray *)getAllChapters

    NSMutableArray *returnArray = [[NSMutableArray alloc] init];

    NSString *url = [NSString stringWithFormat:@"%@get_all_chapters",kWSURL];
    NSDictionary * returnDict = (NSDictionary *) [self callWebService:url];
    if([[returnDict objectForKey:@"status"] isEqualToString:@"success"])
    
        NSDictionary * responseDict = (NSDictionary *) [returnDict objectForKey:@"response"];
        NSArray *resultArray = [responseDict objectForKey:@"result"];

        for(NSDictionary *chapterDict in resultArray)
        
            ChapterDC * chapter = [[ChapterDC alloc] init];
            chapter.ChapterDC_ChapterID=[[chapterDict objectForKey:@"ChapterID"]intValue];
            chapter.ChapterDC_ChapterName = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"ChapterName"]];
            chapter.selectedRegion.RegionDC_RegionID=[ [chapterDict objectForKey:@"RegionID"]intValue];
             NSLog(@"%d",chapter.selectedRegion.RegionDC_RegionID);
            chapter.ChapterDC_AddressLine1 = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"AddressLine1"]];
            chapter.ChapterDC_AddressLine2 = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"AddressLine2"]];
            chapter.ChapterDC_AddressLine3 = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"AddressLine3"]];
            chapter.ChapterDC_Email = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"Email"]];
            chapter.ChapterDC_URL = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"URL"]];
            chapter.ChapterDC_FacebookURL =[ NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"FacebookURL"]];
            chapter.ChapterDC_LinkedInURL = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"LinkedInURL"]];
            chapter.ChapterDC_PhoneNumber =[ NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"PhoneNumber"]];
            chapter.ChapterDC_Postcode = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"Postcode"]];
            chapter.ChapterDC_TwitterURL = [NSString stringWithFormat:@"%@", [chapterDict objectForKey:@"TwitterURL"]];

            NSDictionary * regionDict = (NSDictionary *) [returnDict objectForKey:@"region"];

            
            chapter.selectedRegion = [[RegionDC alloc] init];
            chapter.selectedRegion.RegionDC_RegionID = [[regionDict objectForKey:@"RegionID"]intValue];
            NSLog(@"%d",chapter.selectedRegion.RegionDC_RegionID);
            chapter.selectedRegion.RegionDC_RegionName = [NSString stringWithFormat:@"%@", [regionDict objectForKey:@"RegionName"]];
                NSLog(@"%@",chapter.selectedRegion.RegionDC_RegionName);
            chapter.selectedRegion.RegionDC_ContactName = [NSString stringWithFormat:@"%@", [regionDict objectForKey:@"ContactName"]];
            chapter.selectedRegion.RegionDC_Mobile = [NSString stringWithFormat:@"%@", [regionDict objectForKey:@"Mobile"]];
            chapter.selectedRegion.RegionDC_Landline = [NSString stringWithFormat:@"%@", [regionDict objectForKey:@"Landline"]];
            chapter.selectedRegion.RegionDC_TrainingURL = [NSString stringWithFormat:@"%@", [regionDict objectForKey:@"TrainingURL"]];
            
            [returnArray addObject:chapter];
        
    
    return returnArray;

【问题讨论】：

也许您应该将 int 封装在一个 NSNumber 中？

【参考方案1】：

替换NSDictionary * regionDict = (NSDictionary *) [returnDict objectForKey:@"region"]; 与

NSDictionary * regionDict = (NSDictionary *) [chapterDict objectForKey:@"region"];