ios - nsmutableArray 用最后添加的对象替换元素

Question

在 mutableArray 中添加新元素后，先前添加的元素(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 是一个可变数组

Answer 1

我想你每次都将旧对象和新对象放入 NSMutableArray 中。因为您在 for 循环之外分配了 NSMutableDictionary。

所以让你的 NSMutableDictionary 像下面的代码一样在 for 循环中分配初始化:

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);

    }

   }