Question

在mutableArray中添加新元素之后，添加的元素（从字典中获取）也将替换为新添加的元素。

for (int i = 0; i < [_ContentArray count]; i++){

    if ([[[_ContentArray objectAtIndex:i]objectForKey:@"type"] isEqualToString:@"video"]) {

        NSString *videoUrl = [[_ContentArray objectAtIndex:i]objectForKey:@"url"];

        NSString *videoName = [[_ContentArray objectAtIndex:i]objectForKey:@"title"];


        [_videoContentDict setValue:videoUrl  forKey:@"url"];
        [_videoContentDict setValue:videoName forKey:@"title"];

        [_videoArray addObject:_videoContentDict];


        NSLog(@"%@%%",_videoArray);

    }

    }

这里 - _videoContentDict是一个mutableDictionary _videoArray是一个mutableArray

Answer 1

我认为每次将带有新对象的旧对象都带到NSMutableArray。因为你在for循环之外被分配了NSMutableDictionary。

所以将你的NSMutableDictionary alloc init放在for循环中，如下面的代码：

for (int i = 0; i < [_ContentArray count]; i++){

    if ([[[_ContentArray objectAtIndex:i]objectForKey:@"type"] isEqualToString:@"video"]) {

        _videoContentDict = [[NSMutableDictionary alloc]init];
        NSString *videoUrl = [[_ContentArray objectAtIndex:i]objectForKey:@"url"];

        NSString *videoName = [[_ContentArray objectAtIndex:i]objectForKey:@"title"];


        [_videoContentDict setValue:videoUrl  forKey:@"url"];
        [_videoContentDict setValue:videoName forKey:@"title"];

        [_videoArray addObject:_videoContentDict];


        NSLog(@"%@%%",_videoArray);

    }

   }

nsmutableArray用最后添加的对象替换元素

1 个答案: