MG--OC和Swif毕业设计t的瀑布流布局

项目介绍：

瀑布流（OC和Swift）

算封装的比较好。提供接口，只需要成为MGWaterFlayout的代理，即可在外界设置那个cell的间距，collection View 的inset等进行UI界面的布局，非常方便。

效果

github网址：

OC源码查看Swift源码项目查看

OC

.h

// MGWaterflowLayout.h // MGPuBuLiuDemo // Created by ming on 16/6/9. // Copyright © 2016年 ming. All rights reserved. #import <UIKit/UIKit.h> @class MGWaterflowLayout; #pragma mark - 协议 @protocol MGWaterflowLayoutDelegate <NSObject> @optional - (CGFloat)waterflowLayout:(MGWaterflowLayout *)waterflowLayout heightForItemAtIndex:(NSIndexPath *)indexPath itemWidth:(CGFloat)itemWidth; @optional - (CGFloat)columnCountInWaterflowLayout:(MGWaterflowLayout *)waterflowLayout; - (CGFloat)columnMarginInWaterflowLayout:(MGWaterflowLayout *)waterflowLayout; - (CGFloat)rowMarginInWaterflowLayout:(MGWaterflowLayout *)waterflowLayout; - (UIEdgeInsets)edgeInsetsInWaterflowLayout:(MGWaterflowLayout *)waterflowLayout; - (CGSize)layoutCollectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)layout sizeForItemAtIndexPath:(NSIndexPath *)indexPath; @end #pragma mark - MGWaterflowLayout @interface MGWaterflowLayout : UICollectionViewFlowLayout /** 代理 */ @property (nonatomic, weak) id<MGWaterflowLayoutDelegate> delegate; @end

.m

// MGWaterflowLayout.m // MGPuBuLiuDemo // Created by ming on 16/6/9. // Copyright © 2016年 ming. All rights reserved. #import 'MGWaterflowLayout.h' /** 默认的列数 */ static const NSInteger MGDefaultColumnCount = 3; /** 每一列之间的间距 */ static const CGFloat MGDefaultColumnMargin = 10; /** 每一行之间的间距 */ static const CGFloat MGDefaultRowMargin = 10; /** 边缘间距 */ static const UIEdgeInsets MGDefaultEdgeInsets = {10, 10, 10, 10}; @interface MGWaterflowLayout () /** 存放所有cell的布局属性 */ @property (nonatomic, strong) NSMutableArray *attrsArray; /** 存放所有列的当前高度 */ @property (nonatomic, strong) NSMutableArray *columnHeights; /** 每一行之间的间距 */ - (CGFloat)rowMargin; /** 每一列之间的间距 */ - (CGFloat)columnMargin; /** 列数 */ - (NSInteger)columnCount; /** 边缘间距 */ - (UIEdgeInsets)edgeInsets; @end @implementation MGWaterflowLayout #pragma mark - 常见数据处理 - (CGFloat)rowMargin { if ([self.delegate respondsToSelector:@selector(rowMarginInWaterflowLayout:)]) { return [self.delegate rowMarginInWaterflowLayout:self]; } else { return MGDefaultRowMargin; } } - (CGFloat)columnMargin { if ([self.delegate respondsToSelector:@selector(columnMarginInWaterflowLayout:)]) { return [self.delegate columnMarginInWaterflowLayout:self]; } else { return MGDefaultColumnMargin; } } - (NSInteger)columnCount { if ([self.delegate respondsToSelector:@selector(columnCountInWaterflowLayout:)]) { return [self.delegate columnCountInWaterflowLayout:self]; } else { return MGDefaultColumnCount; } } - (UIEdgeInsets)edgeInsets { if ([self.delegate respondsToSelector:@selector(edgeInsetsInWaterflowLayout:)]) { return [self.delegate edgeInsetsInWaterflowLayout:self]; } else { return MGDefaultEdgeInsets; } } #pragma mark - 懒加载 - (NSMutableArray *)columnHeights { if (!_columnHeights) { _columnHeights = [NSMutableArray array]; } return _columnHeights; } - (NSMutableArray *)attrsArray { if (!_attrsArray) { _attrsArray = [NSMutableArray array]; } return _attrsArray; } - (void)prepareLayout{ [super prepareLayout]; #warning 删除以前保存的高度 [self.columnHeights removeAllObjects]; for (NSInteger i = 0; i < self.columnCount; i++) { [self.columnHeights addObject:@(self.edgeInsets.top)]; } // 清除之前所有的布局属性 [self.attrsArray removeAllObjects]; // 1.获取cell的个数 NSInteger count = [self.collectionView numberOfItemsInSection:0]; // 清除之前所有的布局属性 [self.attrsArray removeAllObjects]; // 2.遍历cell，把每一个布局添加到数组 for (NSInteger i = 0; i < count; i++) { // 创建位置 NSIndexPath *indexPath = [NSIndexPath indexPathForItem:i inSection:0]; // 获取indexPath位置cell对应的布局属性 UICollectionViewLayoutAttributes *attrs = [self layoutAttributesForItemAtIndexPath:indexPath]; [self.attrsArray addObject:attrs]; } } - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath{ // 创建布局属性 UICollectionViewLayoutAttributes *attrs = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath]; CGFloat x,y,w,h; // w = (self.collectionView.frame.size.width - [self edgeInsets].left - [self edgeInsets].right - ([self columnCount] - 1) * MGDefaultColumnMargin)/[self columnCount]; w = (self.collectionView.frame.size.width - self.edgeInsets.left - self.edgeInsets.right - (self.columnCount - 1) * self.columnMargin) / self.columnCount; // 通过代理可以设置高度 if ([self.delegate respondsToSelector:@selector(waterflowLayout:heightForItemAtIndex:itemWidth:)]) { h = [self.delegate waterflowLayout:self heightForItemAtIndex:indexPath itemWidth:w]; }else{ h = 70 + arc4random_uniform(100); } // 取得所有列中高度最短的列 NSInteger minHeightColumn = [self minHeightColumn]; // x = MGDefaultEdgeInsets.left + minHeightColumn * (w + MGDefaultColumnMargin); x = self.edgeInsets.left + minHeightColumn * (w + self.columnMargin); y = self.edgeInsets.top + [self.columnHeights[minHeightColumn] floatValue] + self.rowMargin; #warning 更改最短的一列 [self.columnHeights replaceObjectAtIndex:minHeightColumn withObject:@(y+h)]; attrs.frame = CGRectMake(x, y, w, h); return attrs; } /** * 决定cell的排布 * 第一次显示时会调用一次 * 用力拖拽时也会调一次 */ - (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect{ return self.attrsArray; } /// 返回collectionView的滚动范围 - (CGSize)collectionViewContentSize{ if (self.columnHeights.count == 0) { return CGSizeMake(0, 0); } // 获得最高的列 NSInteger maxColum = [self maxHeightColumn]; CGFloat height = [self.columnHeights[maxColum] floatValue] + MGDefaultEdgeInsets.bottom; CGFloat width = self.collectionView.frame.size.width; return CGSizeMake(width, height); } /// 取得所有列中高度最短的列 - (NSInteger)minHeightColumn{ // 找出columnHeights的最小值 NSInteger minHeightColum = 0; CGFloat minColumHeight = [self.columnHeights[0] floatValue]; for (NSInteger i = 1; i < self.columnHeights.count; i++) { CGFloat tempHeight = [self.columnHeights[i] floatValue]; if (tempHeight < minColumHeight) { minHeightColum = i; minColumHeight = tempHeight; } } return minHeightColum; } /// 取得所有列中高度最高的列 - (NSInteger)maxHeightColumn{ // 找出columnHeights的最小值 NSInteger maxHeightColumn = 0; CGFloat maxColumnHeight = [self.columnHeights[0] floatValue]; for (NSInteger i = 1; i < self.columnHeights.count; i++) { CGFloat tempHeight = [self.columnHeights[i] floatValue]; if (tempHeight > maxColumnHeight) { maxHeightColumn = i; maxColumnHeight = tempHeight; } } return maxHeightColumn; } ///** // * 在元素的Interactive Movement期间被调用 // * 它带有target（目标元素）和先前的cell的indexPaths（索引地址） // */ //- (UICollectionViewLayoutInvalidationContext *)invalidationContextForInteractivelyMovingItems:(NSArray<NSIndexPath *> *)targetIndexPaths withTargetPosition:(CGPoint)targetPosition previousIndexPaths:(NSArray<NSIndexPath *> *)previousIndexPaths previousPosition:(CGPoint)previousPosition{ // UICollectionViewLayoutInvalidationContext *context = [super invalidationContextForInteractivelyMovingItems:targetIndexPaths withTargetPosition:targetPosition previousIndexPaths:previousIndexPaths previousPosition:previousPosition]; // [self.collectionView moveItemAtIndexPath:previousIndexPaths[0] toIndexPath:targetIndexPaths[0]]; // // [self.collectionView reloadData]; // return context; //} // ///** // * 这个与上一个函数类似，开题报告，但它只在Interactive Movement结束后才调用 // * 它带有target（目标元素）和先前的cell的indexPaths（索引地址） // */ //- (UICollectionViewLayoutInvalidationContext *)invalidationContextForEndingInteractiveMovementOfItemsToFinalIndexPaths:(NSArray<NSIndexPath *> *)indexPaths previousIndexPaths:(NSArray<NSIndexPath *> *)previousIndexPaths movementCancelled:(BOOL)movementCancelled{ // UICollectionViewLayoutInvalidationContext *context = [super invalidationContextForEndingInteractiveMovementOfItemsToFinalIndexPaths:indexPaths previousIndexPaths:previousIndexPaths movementCancelled:movementCancelled]; // [self.collectionView moveItemAtIndexPath:previousIndexPaths[0] toIndexPath:indexPaths[0]]; // return context; //} @end#p#分页标题#e#

Swift

// MGWaterFlowLayout.swift // MGDS_Swift // Created by i-Techsys.com on 17/1/21. // Copyright © 2017年 i-Techsys. All rights reserved. import UIKit // MARK: - 协议 @objc protocol MGWaterFlowLayoutDelegate: NSObjectProtocol { @objc optional func waterflowLayout(waterflowLayout: MGWaterFlowLayout,heightForItemAtIndex indexPath: IndexPath,itemWidth: CGFloat) -> CGFloat @objc optional func columnCountInWaterflowLayout(waterflowLayout: MGWaterFlowLayout) -> Int @objc optional func columnMarginInWaterflowLayout(waterflowLayout: MGWaterFlowLayout) -> CGFloat @objc optional func rowMarginInWaterflowLayout(waterflowLayout: MGWaterFlowLayout) -> CGFloat @objc optional func edgeInsetsInWaterflowLayout(waterflowLayout: MGWaterFlowLayout) -> UIEdgeInsets @objc optional func layoutCollectionView(collectionView: UICollectionView,layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) } // MARK: - 默认参数 /** 默认的列数 */ private let MGDefaultColumnCount: Int = 3 /** 每一列之间的间距 */ private let MGDefaultColumnMargin: CGFloat = 10 /** 每一行之间的间距 */ private let MGDefaultRowMargin: CGFloat = 10 /** 边缘间距 */ private let MGDefaultEdgeInsets: UIEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10) class MGWaterFlowLayout: UICollectionViewFlowLayout { // MARK: - 自定义属性 /** 存放所有cell的布局属性 */ fileprivate var attrsArray = [UICollectionViewLayoutAttributes]() /** 存放所有列的当前高度 */ fileprivate var columnHeights: [CGFloat] = [CGFloat]() /** MGWaterFlowLayout的代理 */ weak var delegate: MGWaterFlowLayoutDelegate? } // MARK: - 边距和距离等 extension MGWaterFlowLayout { func rowMargin() -> CGFloat { if (self.delegate?.responds(to: #selector(MGWaterFlowLayoutDelegate.rowMarginInWaterflowLayout(waterflowLayout:))))! { return (delegate?.rowMarginInWaterflowLayout!(waterflowLayout: self))! }else { return MGDefaultRowMargin } } func columnMargin() -> CGFloat { if (self.delegate?.responds(to: #selector(MGWaterFlowLayoutDelegate.columnMarginInWaterflowLayout(waterflowLayout:))))! { return (delegate?.columnMarginInWaterflowLayout!(waterflowLayout: self))! }else { return MGDefaultColumnMargin } } func columnCount() -> Int { if (self.delegate?.responds(to: #selector(MGWaterFlowLayoutDelegate.columnCountInWaterflowLayout(waterflowLayout:))))! { return (delegate?.columnCountInWaterflowLayout!(waterflowLayout: self))! }else { return MGDefaultColumnCount } } func edgeInsets() -> UIEdgeInsets { if (self.delegate?.responds(to: #selector(MGWaterFlowLayoutDelegate.edgeInsetsInWaterflowLayout(waterflowLayout:))))! { return (delegate?.edgeInsetsInWaterflowLayout!(waterflowLayout: self))! }else { return MGDefaultEdgeInsets } } } // MARK: - 系统方法 extension MGWaterFlowLayout { override func prepare() { super.prepare() columnHeights.removeAll() for _ in 0..<self.columnCount() { self.columnHeights.append(self.edgeInsets().top) } // 清除之前所有的布局属性 attrsArray.removeAll() // 1.获取cell的个数 let count = (collectionView?.numberOfItems(inSection: 0))! as Int // 2.遍历cell，把每一个布局添加到数组 for i in 0..<count { let indexPath = IndexPath(item: i, section: 0) let attrs = self.layoutAttributesForItem(at: indexPath) attrsArray.append(attrs!) } } override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { super.layoutAttributesForItem(at: indexPath) // 创建布局属性 let attrs = UICollectionViewLayoutAttributes(forCellWith: indexPath) var x,y,w,h :CGFloat w = (self.collectionView!.frame.size.width - self.edgeInsets().left - self.edgeInsets().right - (CGFloat(self.columnCount()-1) * self.columnMargin())) / CGFloat(self.columnCount()) // 通过代理可以设置高度 if (self.delegate?.responds(to: #selector(MGWaterFlowLayoutDelegate.waterflowLayout(waterflowLayout:heightForItemAtIndex:itemWidth:))))! { h = self.delegate!.waterflowLayout!(waterflowLayout: self, heightForItemAtIndex: indexPath, itemWidth: w) }else { h = CGFloat(70) + CGFloat(arc4random_uniform(100)) } // 取得所有列中高度最短的列 let minHeightColumn = self.minHeightColumn() x = self.edgeInsets().left + CGFloat(minHeightColumn) * (w + self.columnMargin()); y = self.edgeInsets().top + self.columnHeights[minHeightColumn] + self.rowMargin() // #warning 更改最短的一列 self.columnHeights[minHeightColumn] = y + h attrs.frame = CGRect(x: x, y: y, width: w, height: h) return attrs; } /** * 决定cell的排布 * 第一次显示时会调用一次 * 用力拖拽时也会调一次 */ override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? { super.layoutAttributesForElements(in: rect) return self.attrsArray } /// 返回collectionView的滚动范围 override var collectionViewContentSize: CGSize { let _ = super.collectionViewContentSize if (self.columnHeights.count == 0) { return CGSize.zero } // 获得最高的列 let maxColum = self.maxHeightColumn() let height: CGFloat = self.columnHeights[maxColum] + MGDefaultEdgeInsets.bottom; let width: CGFloat = self.collectionView!.frame.size.width; return CGSize(width: width, height: height) } } // MARK: - 自定义方法 extension MGWaterFlowLayout { /// 取得所有列中高度最短的列 fileprivate func minHeightColumn() -> Int { // 找出columnHeights的最小值 var minHeightColum: Int = 0 var minColumHeight: CGFloat = self.columnHeights[0] for i in 1..<columnHeights.count { let tempHeight:CGFloat = self.columnHeights[i] if (tempHeight < minColumHeight) { minHeightColum = i; minColumHeight = tempHeight; } } return minHeightColum } /// 取得所有列中高度最高的列 fileprivate func maxHeightColumn() -> Int { // 找出columnHeights的最高值 var maxHeightColumn: Int = 0 var maxColumnHeight: CGFloat = self.columnHeights[0] for i in 1..<columnHeights.count { let tempHeight:CGFloat = self.columnHeights[i] if (tempHeight < maxColumnHeight) { maxHeightColumn = i maxColumnHeight = tempHeight } } return maxHeightColumn } }

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