NSMutableArray中的值似乎会自动更改。这怎么可能?

我正在给一个 UICollectionView 来自 NSMutableArray , rainbowArray ,其中填充了 UIColors 使用此 very elegant code from BJ Homer :

float INCREMENT = 0.04;

for (float hue = 0.0; hue < 1.0; hue += INCREMENT)
{
    UIColor *color = [UIColor colorWithHue:hue
                                saturation:1.0
                                brightness:1.0
                                     alpha:1.0];
    [rainbowArray addObject:color];
    NSLog(@"color in rainbow is %@",color);
}

工作很棒! NSLog'd 输出证明颜色存在。然而,当我去实际应用颜色 UICollectionViewCells , NSLogs 证明颜色不知怎么变回了 colorWithHue 的值 1 0 0 1 .

这是我的代码 cellForItemAtIndexPath ,简化了,因为我在两个CV之间共享代理方法:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

    if (collectionView == self.usedColorsCollectionView)
    {
       ...        
    }


    else if (collectionView == self.pickerCollectionView)
    {
        static NSString *cellIdentifier = @"pickerCell";

        UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];


        for (UIColor *thisColor in rainbowArray)
        {
            NSLog(@"Somehow color has changed to %@, and is being applied to cell",thisColor);

            [cell setBackgroundColor:thisColor];

            [cell.layer setCornerRadius:18.0f];
            [cell setUserInteractionEnabled:YES];

            return cell;
        }
    }
    return 0;
}

下面是日志,也是简化的,首先是创建并插入数组时的值:

2014-08-24 22:38:24.936 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 1 0 0 1
2014-08-24 22:38:24.937 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 1 0.24 0 1
2014-08-24 22:38:24.938 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 1 0.48 0 1
2014-08-24 22:38:24.939 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 1 0.72 0 1
2014-08-24 22:38:24.940 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 1 0.96 0 1
2014-08-24 22:38:24.940 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 0.8 1 0 1
2014-08-24 22:38:24.941 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 0.56 1 0 1
2014-08-24 22:38:24.941 WMDGx[26662:90b] color in rainbow is UIDeviceRGBColorSpace 0.32 1 0 1

...

以下是应用于单元格时的值:

2014-08-24 22:38:24.959 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.960 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.961 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.961 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.962 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.963 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.964 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.964 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.965 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.965 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell
2014-08-24 22:38:24.966 WMDGx[26662:90b] Somehow color has changed to UIDeviceRGBColorSpace 1 0 0 1, and is being applied to cell

下面是结果的截图:

所讨论的细胞是大的红色细胞,应该是多色的。

几个小时来我一直在想办法解决这个问题。有什么想法吗?

编辑:

全部修复!我使用了@Paulw11提供的代码,但也感谢@Shan和@Ramshad提供的一些语法,因为我不熟悉这些语法。

现在看起来是这样的:

在我添加此代码后( posted by @neilsbot in this answer )现在包含68个色孔。

float INCREMENT = 0.06;

for (float hue = 0.0; hue < 1.0; hue += INCREMENT)
{
    UIColor *color = [UIColor colorWithHue:hue
                                saturation:1.0
                                brightness:1.0
                                     alpha:1.0];

    CGFloat oldHue, saturation, brightness, alpha ;

    BOOL gotHue = [color getHue:&oldHue saturation:&saturation brightness:&brightness alpha:&alpha ];

    if (gotHue)
    {
        UIColor * newColor = [ UIColor colorWithHue:hue saturation:0.7 brightness:brightness alpha:alpha ];
        UIColor * newerColor = [ UIColor colorWithHue:hue saturation:0.5 brightness:brightness alpha:alpha ];
        UIColor * newestColor = [ UIColor colorWithHue:hue saturation:0.3 brightness:brightness alpha:alpha ];

        [rainbowArray addObject:color];
        [rainbowArray addObject:newColor];
        [rainbowArray addObject:newerColor];
        [rainbowArray addObject:newestColor];
    }
}