Question

我正在使用UICollectionViewController来显示橙色背景的天数，当用户点击那天时，那天的背景应该变为灰色。除了星期一，索引path.row值为0（它是系列中的第一个项目）之外，该程序每天都能正常工作。它将包括其自身在内的所有视图的背景更改为橙色

    @implementation DayControllerViewController
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  
    return self;}

    -(void)viewDidLoad{
    [super viewDidLoad];
    dayLabels =  [NSArray arrayWithObjects:@"Monday", @"Tuesday", @"Wednesday", @"Thursday", @"Friday", @"Saturday", @"Sunday", nil];
    //[self.collectionView reloadData];    
}

    -(void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

    -(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}

    -(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return dayLabels.count;
}

    UICollectionViewCell *cell;

    -(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *identifier = @"Cell";

    cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    UILabel *recipeImageView = (UILabel *)[cell viewWithTag:100];
    [recipeImageView setText:  [dayLabels objectAtIndex:indexPath.row]];
    [recipeImageView setTag : indexPath.row];

    UIColor *orangecol = [UIColor colorWithRed:236.0/255 green:85.0/255 blue:50.0/255 alpha:1];

    [recipeImageView setBackgroundColor:orangecol];
    NSLog(@"Label Tag: %i",recipeImageView.tag);
    return cell;

}

    -(BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"this is caled");
    return YES;
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    UIColor *orangecol = [UIColor colorWithRed:236.0/255 green:85.0/255 blue:50.0/255 alpha:1];

    UIColor *greycol = [UIColor colorWithWhite:0 alpha:0.3];

    NSLog(@"DidSelect Called");
    UILabel* lbl = (UILabel*)[collectionView viewWithTag:indexPath.row];
    NSLog(@"Label With Tag: %i",lbl.tag);
    if([lbl.backgroundColor isEqual: orangecol]){
        NSLog(@"lbl Clicked %@",lbl.text);
        [lbl setBackgroundColor:greycol];
    }
    else {
        [lbl setBackgroundColor:orangecol];
    }
}

}

如果我有足够的声誉，我会张贴图片。感谢

Answer 1

最好使用cellForItemAtIndexPath来获取单元格。然后您可以使用标签访问标签。我想你会在层次结构中找回另一个视图而不是你期望的标签。（对于所有视图，标记0都为true，首先发现调用返回）

最佳Jürgen

Answer 2

您可能已将集合视图的标记设置为0，更改了集合视图的标记值

UICollectionView第0个索引改变完整视图的颜色

2 个答案: