ios - KNMultiItemSelector 预选项目不工作

Question

我正在尝试在我的代码中实现 KNMultiItemSelector 以选择数组中的多个项目。我一直在尝试让选择器在初始化时显示一些已勾选的项目，但它似乎不起作用。我的代码如下:

for (Option* option in optionssList) {
        NSString* name = [NSString stringWithFormat:@"%@", option.name];
        KNSelectorItem* item = [[KNSelectorItem alloc] initWithDisplayValue:name selectValue:option.id imageUrl:nil];
        [items addObject:item];
        if ([_selectedOptions containsObject:item]) {
            NSLog(@"Already selected");
            [_selectedOptions addObject:item];
        }
    }

    KNMultiItemSelector * selector = [[KNMultiItemSelector alloc] initWithItems:items
                                                               preselectedItems:_selectedOptions
                                                                          title:@"List"
                                                                placeholderText:@"Select Options"
                                                                       delegate:self];

    selector.useRecentItems = YES;
    selector.maxNumberOfRecentItems = 5;

    UINavigationController * uinav = [[UINavigationController alloc] initWithRootViewController:selector];
    uinav.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; // iPhone
    uinav.modalPresentationStyle = UIModalPresentationFormSheet;       // iPad only
    [self presentViewController:uinav animated:YES completion:nil];

如有任何帮助，我们将不胜感激。谢谢!

Answer 1

您遇到了 KNMultiItemSelector 中的错误:KNMultiItemSelector 初始化程序忽略了 preselectedItems。要解决此错误，请将要选择的项目的 selected 设置为 YES，并确保 preselectedItems 不为零。 (它不需要包含预选项。)例如:

KNSelectorItem *item = [[KNSelectorItem alloc] initWithDisplayValue:@"Item"];
item.selected = YES;

KNMultiItemSelector *selector = [[KNMultiItemSelector alloc] initWithItems:@[item]
    preselectedItems:@[]
    title:@"List"
    placeholderText:@"Select Options"
    delegate:self];