Objective C 语言 怎样实现瀑布流布局

Objective-C阿木 发布于 22 天前 5 次阅读

Objective-C 实现瀑布流布局

瀑布流布局是一种流行的网页和移动应用布局方式，它模仿了传统报纸的排版，将内容以流式的方式排列，每一行可以放置多个元素，当一行放置不下时，下一行会继续排列。在Objective-C中，我们可以使用UIKit框架来实现瀑布流布局。以下是一篇关于如何在Objective-C中实现瀑布流布局的技术文章。

瀑布流布局在移动应用中非常常见，它能够提供良好的用户体验，使得内容更加丰富和动态。在Objective-C中，我们可以通过自定义UICollectionViewLayout来实现瀑布流布局。本文将详细介绍如何在Objective-C中使用UICollectionViewLayout来创建瀑布流布局。

瀑布流布局的基本原理

瀑布流布局的核心思想是将元素按照一定的规则排列，通常规则如下：

1. 每一行可以放置多个元素。

2. 元素在每一行中的位置是随机的。

3. 当一行放置不下所有元素时，下一行会继续排列。

创建瀑布流布局

1. 创建UICollectionViewLayout子类

我们需要创建一个继承自UICollectionViewLayout的子类，用于定义瀑布流布局的具体实现。

```objective-c

@interface WaterfallFlowLayout : UICollectionViewLayout

@property (nonatomic, strong) NSArray<CGSize > itemSizes;

@end

@implementation WaterfallFlowLayout

- (void)prepareLayout {

[super prepareLayout];

// 初始化itemSizes数组

self.itemSizes = @[[CGSizeMake(100, 100)], [CGSizeMake(150, 150)], [CGSizeMake(120, 120)]];

}

- (CGSize)collectionViewContentSize {

// 计算整个collectionView的大小

CGFloat width = CGRectGetWidth(self.collectionView.bounds);

CGFloat height = 0;

for (CGSize size in self.itemSizes) {

height += CGRectGetHeight(size);

}

return CGSizeMake(width, height);

}

- (NSArray<UICollectionViewLayoutAttributes > )layoutAttributesForElementsInRect:(CGRect)rect {

// 返回所有元素的布局属性

NSMutableArray<UICollectionViewLayoutAttributes > attributes = [NSMutableArray array];

CGFloat currentY = 0;

for (CGSize size in self.itemSizes) {

UICollectionViewLayoutAttributes attributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:[NSIndexPath indexPathForItem:0 inSection:0]];

attributes.frame = CGRectMake(0, currentY, CGRectGetWidth(self.collectionView.bounds), CGRectGetHeight(size));

attributes.size = size;

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setAlpha:0.5];

[attributes setZIndex:0];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes.frame))];

[attributes setAlpha:0.5];

[attributes setTransform:CGAffineTransformMakeScale(0.5, 0.5)];

[attributes setCenter:CGPointMake(CGRectGetMidX(attributes.frame), CGRectGetMidY(attributes