ios - iOS UICollectionView - 默认流，从右到左填充行

Question

我在我的一个应用程序 UICollectionView 中使用自定义单元格但具有默认流。目前，此视图连续显示 3 个单元格（所有单元格大小相同）。单元格从左到右填充该行，但我需要从右到左。

可能吗？我需要创建自定义流布局吗？如果是这样，任何人都可以举一个简单的例子吗？

任何帮助将不胜感激。

Answer 1

假设您只需要三个单元格，并为此集合视图使用标题视图，您将需要执行以下步骤：

覆盖 UICollectionViewFlowLayout

@interface GSRightToLeftCollectionViewFlowLayout : UICollectionViewFlowLayout

（GS 代表 Groboot SmarTech :)）

.m 应该如下所示：

#import "GSRightToLeftCollectionViewFlowLayout.h"

typedef enum {
    // enum for comfortibility.
    CellXPositionLeft = 1,
    CellXpositionRight = 2,
    CellXpositionCenter = 3,
    CellXPositionNone = 4
} CellXPosition;

@interface GSRightToLeftCollectionViewFlowLayout ()

@property (nonatomic) BOOL cellFlag;
@property (nonatomic) float cellLeftX;
@property (nonatomic) float cellMiddleX;
@property (nonatomic) float cellRightX;

@end

@implementation GSRightToLeftCollectionViewFlowLayout

// when ever the bounds change, call layoutAttributesForElementsInRect:
- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds
{
    return YES;
}

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
    NSMutableArray *allItems = [[super layoutAttributesForElementsInRect:rect] mutableCopy];

    for (UICollectionViewLayoutAttributes *attribute in allItems) {

        // when we get an item, calculate it's English writing position,
        // so that we can convert it to the Hebrew - Arabic position.
        if (!self.cellFlag) {

            [self calculateLocationsForCellsWithAttribute:attribute];

            self.cellFlag = YES;
        }

        // if it's a header, do not change it's place.
        if (attribute.representedElementKind == UICollectionElementKindSectionHeader) {

            continue;
        }

        // check where the item should be placed.
        CellXPosition position = [self attributeForPosition:attribute];

        switch (position) {
            case CellXPositionLeft:
                attribute.frame = CGRectMake(self.cellLeftX, attribute.frame.origin.y, attribute.frame.size.width, attribute.frame.size.height);
                break;
            case CellXpositionRight:
                attribute.frame = CGRectMake(self.cellRightX, attribute.frame.origin.y, attribute.frame.size.width, attribute.frame.size.height);
                break;
            case CellXpositionCenter:
                attribute.frame = CGRectMake(self.cellMiddleX, attribute.frame.origin.y, attribute.frame.size.width, attribute.frame.size.height);
                break;
            case CellXPositionNone:
                NSLog(@"warning");
                break;
        }
    }

    return allItems;
}


- (CellXPosition)attributeForPosition:(UICollectionViewLayoutAttributes *)attribute
{
    CellXPosition cellXposition = CellXPositionNone;

    // we will return an opposite answer
    if (attribute.indexPath.row % 3 == 0) {

        // if it's in the left side, move it to the right
        cellXposition = CellXpositionRight;

    } else if (attribute.indexPath.row % 3 == 1) {

        cellXposition = CellXpositionCenter;

    } else if (attribute.indexPath.row % 3) {

        // if it's in the right side, move it to the left
        cellXposition = CellXPositionLeft;
    }

    return cellXposition;
}

- (void)calculateLocationsForCellsWithAttribute:(UICollectionViewLayoutAttributes *)attribute
{
    float cellWidth = self.itemSize.width;
    float minimumX = self.sectionInset.left;
    float maximumX = self.sectionInset.right;
    float displayWidth = self.collectionView.contentSize.width - minimumX - maximumX;
    // on iOS6, displayWidth will be 0 (don't know why), so insert an if (displayWidth == 0) and set manually the size.

    self.cellLeftX = minimumX;
    float space = (displayWidth - cellWidth * 3) / 2;
    self.cellMiddleX = self.cellRightX + cellWidth + space;
    self.cellRightX = self.cellMiddleX + cellWidth + space;
}

@end

在显示 CollectionView 的类中，您需要执行以下操作：

如果您使用情节提要： 1. 将 collectionView 布局更改为自定义（在属性检查器中） 2. 将其类设置为 GSRightToLeftCollectionViewFlowLayout。3. 在 ViewDidLoad 中（或者每当你执行初始化时）

- (void)viewDidLoad
{
    [super viewDidLoad];

    GSRightToLeftCollectionViewFlowLayout *layout = [[GSRightToLeftCollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(98, 138); // set the item size.
    layout.minimumLineSpacing = 1; // other layout properties.
    layout.minimumInteritemSpacing = 1; // other layout properties.
    layout.headerReferenceSize = CGSizeMake(50, 18);
    layout.sectionInset = UIEdgeInsetsMake(1.0f, 0.0f, 1.0f, 0.0f);
    layout.scrollDirection = UICollectionViewScrollDirectionVertical;
    // in case you use headers / footers. this is also where you would register a Cell if you don't use storyboards.
    [self.collectionView registerClass:[GSReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderView"];
    self.collectionView.collectionViewLayout = layout;
}

Answer 2

由于阿拉伯语翻译，我遇到了同样的问题。

这是我的解决方案：创建 UICollectionViewFlowLayout 的子类并覆盖

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect:

我使用 NSLocales 字符方向作为 RTL 翻译的触发器。如果它是 LTR 语言，它只返回默认属性。

希望它有帮助。

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
    NSArray *supersAttributes = [super layoutAttributesForElementsInRect:rect];
    NSLocale *currentLocale = ((NSLocale *) [NSLocale currentLocale]);
    NSLocaleLanguageDirection direction = [NSLocale characterDirectionForLanguage:currentLocale.localeIdentifier];

    // if it's an RTL language: change the frame
    if (direction == NSLocaleLanguageDirectionRightToLeft) {
        for (UICollectionViewLayoutAttributes *attributes in supersAttributes) {
            CGRect frame = attributes.frame;
            frame.origin.x = rect.size.width - attributes.frame.size.width - attributes.frame.origin.x;
            attributes.frame = frame;
        }
    }
    return supersAttributes;
}

Answer 3

@implementation CollectionReversedLayout
- (void)reverseLayoutAttributes:(UICollectionViewLayoutAttributes *)attributes {
     CGPoint newCenter = attributes.center;
     newCenter.x = self.collectionViewContentSize.width - newCenter.x;
     attributes.center = newCenter;
     return attributes;
}

- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect {
    NSArray *s = [super layoutAttributesForElementsInRect:rect];
    for (UICollectionViewLayoutAttributes *attributes in s) {
        [self reverseLayoutAttributes:attributes];
    }
    return s;
}

- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewLayoutAttributes *s = [super layoutAttributesForItemAtIndexPath:indexPath];
    [self reverseLayoutAttributes:s];
    return s;
}