363 lines
19 KiB
Mathematica
363 lines
19 KiB
Mathematica
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//
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// ZLCollectionViewHorzontalLayout.m
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// ZLCollectionView
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//
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// Created by zhaoliang chen on 2019/1/25.
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// Copyright © 2019 zhaoliang chen. All rights reserved.
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//
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#import "ZLCollectionViewHorzontalLayout.h"
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#import "ZLCollectionReusableView.h"
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#import "ZLCollectionViewLayoutAttributes.h"
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#import "ZLCollectionViewBackgroundViewLayoutAttributes.h"
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@interface ZLCollectionViewHorzontalLayout()
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@end
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@implementation ZLCollectionViewHorzontalLayout
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#pragma mark - 初始化属性
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- (instancetype)init {
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self = [super init];
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if (self) {
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self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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}
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return self;
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}
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- (void)prepareLayout {
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[super prepareLayout];
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//这里很关键，不加此判断在悬浮情况下将卡的怀疑人生...
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if (!self.isNeedReCalculateAllLayout) {
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return;
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}
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CGFloat totalHeight = self.collectionView.frame.size.height;
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CGFloat x = 0;
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CGFloat y = 0;
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CGFloat headerW = 0;
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CGFloat footerW = 0;
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UIEdgeInsets edgeInsets = UIEdgeInsetsZero;
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CGFloat minimumLineSpacing = 0;
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CGFloat minimumInteritemSpacing = 0;
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NSUInteger sectionCount = [self.collectionView numberOfSections];
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self.attributesArray = [NSMutableArray new];
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self.collectionHeightsArray = [NSMutableArray arrayWithCapacity:sectionCount];
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for (int index= 0; index<sectionCount; index++) {
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NSUInteger itemCount = [self.collectionView numberOfItemsInSection:index];
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:referenceSizeForHeaderInSection:)]) {
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headerW = [self.delegate collectionView:self.collectionView layout:self referenceSizeForHeaderInSection:index].width;
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} else {
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headerW = self.headerReferenceSize.width;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:referenceSizeForFooterInSection:)]) {
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footerW = [self.delegate collectionView:self.collectionView layout:self referenceSizeForFooterInSection:index].width;
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} else {
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footerW = self.footerReferenceSize.width;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) {
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edgeInsets = [self.delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:index];
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} else {
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edgeInsets = self.sectionInset;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:minimumLineSpacingForSectionAtIndex:)]) {
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minimumLineSpacing = [self.delegate collectionView:self.collectionView layout:self minimumLineSpacingForSectionAtIndex:index];
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} else {
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minimumLineSpacing = self.minimumLineSpacing;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:minimumInteritemSpacingForSectionAtIndex:)]) {
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minimumInteritemSpacing = [self.delegate collectionView:self.collectionView layout:self minimumInteritemSpacingForSectionAtIndex:index];
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} else {
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minimumInteritemSpacing = self.minimumInteritemSpacing;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:registerBackView:)]) {
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NSString* className = [self.delegate collectionView:self.collectionView layout:self registerBackView:index];
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if (className != nil && className.length > 0) {
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NSAssert([[NSClassFromString(className) alloc]init]!=nil, @"代理collectionView:layout:registerBackView:里面必须返回有效的类名!");
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[self registerClass:NSClassFromString(className) forDecorationViewOfKind:className];
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} else {
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[self registerClass:[ZLCollectionReusableView class] forDecorationViewOfKind:@"ZLCollectionReusableView"];
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}
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}
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else {
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[self registerClass:[ZLCollectionReusableView class] forDecorationViewOfKind:@"ZLCollectionReusableView"];
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}
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x = [self maxHeightWithSection:index];
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y = edgeInsets.top;
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// 添加页首属性
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if (headerW > 0) {
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NSIndexPath *headerIndexPath = [NSIndexPath indexPathForItem:0 inSection:index];
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ZLCollectionViewLayoutAttributes* headerAttr = [ZLCollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader withIndexPath:headerIndexPath];
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headerAttr.frame = CGRectMake(x, 0, headerW, self.collectionView.frame.size.height);
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[headerAttr setValue:[NSValue valueWithCGRect:headerAttr.frame] forKey:@"orginalFrame"];
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[self.attributesArray addObject:headerAttr];
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[self.headerAttributesArray addObject:headerAttr];
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}
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x += headerW ;
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CGFloat itemStartX = x;
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CGFloat lastX = x;
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if (itemCount > 0) {
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x += edgeInsets.left;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:typeOfLayout:)]) {
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self.layoutType = [self.delegate collectionView:self.collectionView layout:self typeOfLayout:index];
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}
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NSAssert((self.layoutType==LabelVerticalLayout||self.layoutType==ColumnLayout||self.layoutType==AbsoluteLayout), @"横向布局暂时只支持LabelVerticalLayout,ColumnLayout,AbsoluteLayout!");
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//NSInteger columnCount = 1;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:columnCountOfSection:)]) {
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self.columnCount = [self.delegate collectionView:self.collectionView layout:self columnCountOfSection:index];
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}
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// 定义一个列高数组 记录每一列的总高度
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CGFloat *columnWidths = (CGFloat *) malloc(self.columnCount * sizeof(CGFloat));
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CGFloat itemHeight = 0.0;
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if (self.layoutType == ClosedLayout) {
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for (int i=0; i<self.columnCount; i++) {
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columnWidths[i] = x;
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}
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itemHeight = (totalHeight - edgeInsets.top - edgeInsets.bottom - minimumInteritemSpacing * (self.columnCount - 1)) / self.columnCount;
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}
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NSInteger lastColumnIndex = 0;
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NSMutableArray* arrayOfAbsolute = [NSMutableArray new]; //储存绝对定位布局的数组
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for (int i=0; i<itemCount; i++) {
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:i inSection:index];
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CGSize itemSize = CGSizeZero;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:sizeForItemAtIndexPath:)]) {
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itemSize = [self.delegate collectionView:self.collectionView layout:self sizeForItemAtIndexPath:indexPath];
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} else {
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itemSize = self.itemSize;
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}
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ZLCollectionViewLayoutAttributes *attributes = [ZLCollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];
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NSInteger preRow = self.attributesArray.count - 1;
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switch (self.layoutType) {
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#pragma mark 纵向标签布局处理
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case LabelVerticalLayout: {
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//找上一个cell
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if(preRow >= 0){
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if(i > 0) {
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ZLCollectionViewLayoutAttributes *preAttr = self.attributesArray[preRow];
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y = preAttr.frame.origin.y + preAttr.frame.size.height + minimumInteritemSpacing;
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if (y + itemSize.height > totalHeight - edgeInsets.bottom) {
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y = edgeInsets.top;
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x += itemSize.width + minimumLineSpacing;
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}
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}
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}
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attributes.frame = CGRectMake(x, y, itemSize.width, itemSize.height);
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}
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break;
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case LabelHorizontalLayout: {
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}
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break;
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#pragma mark 列布局处理 | 横向标签布局处理
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case ClosedLayout: {
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CGFloat max = CGFLOAT_MAX;
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NSInteger column = 0;
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if (self.columnSortType == Sequence) {
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column = lastColumnIndex;
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} else {
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for (int i = 0; i < self.columnCount; i++) {
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if (columnWidths[i] < max) {
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max = columnWidths[i];
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column = i;
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}
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}
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}
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CGFloat itemX = columnWidths[column];
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CGFloat itemY = edgeInsets.top + (itemHeight+minimumInteritemSpacing)*column;
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attributes.frame = CGRectMake(itemX, itemY, itemSize.width, itemHeight);
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columnWidths[column] += (itemSize.width + minimumLineSpacing);
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lastColumnIndex++;
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if (lastColumnIndex >= self.columnCount) {
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lastColumnIndex = 0;
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}
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}
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break;
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case AbsoluteLayout: {
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CGRect itemFrame = CGRectZero;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:rectOfItem:)]) {
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itemFrame = [self.delegate collectionView:self.collectionView layout:self rectOfItem:indexPath];
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}
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CGFloat absolute_x = x+itemFrame.origin.x;
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CGFloat absolute_y = edgeInsets.top+itemFrame.origin.y;
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CGFloat absolute_h = itemFrame.size.height;
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if ((absolute_y+absolute_h>self.collectionView.frame.size.height-edgeInsets.bottom)&&(absolute_y<self.collectionView.frame.size.height-edgeInsets.top)) {
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absolute_h -= (absolute_y+absolute_h-(self.collectionView.frame.size.height-edgeInsets.bottom));
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}
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CGFloat absolute_w = itemFrame.size.width;
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attributes.frame = CGRectMake(absolute_x, absolute_y, absolute_w, absolute_h);
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[arrayOfAbsolute addObject:attributes];
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}
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break;
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default: {
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}
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break;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:transformOfItem:)]) {
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attributes.transform3D = [self.delegate collectionView:self.collectionView layout:self transformOfItem:indexPath];
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:zIndexOfItem:)]) {
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attributes.zIndex = [self.delegate collectionView:self.collectionView layout:self zIndexOfItem:indexPath];
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:alphaOfItem:)]) {
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attributes.alpha = [self.delegate collectionView:self.collectionView layout:self alphaOfItem:indexPath];
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}
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attributes.indexPath = indexPath;
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if (self.layoutType != PercentLayout) {
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//if (![self.attributesArray containsObject:attributes]) {
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[self.attributesArray addObject:attributes];
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//}
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}
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if (self.layoutType == ClosedLayout) {
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CGFloat max = 0;
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for (int i = 0; i < self.columnCount; i++) {
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if (columnWidths[i] > max) {
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max = columnWidths[i];
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}
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}
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lastX = max;
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} else if (self.layoutType == AbsoluteLayout) {
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if (i==itemCount-1) {
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for (ZLCollectionViewLayoutAttributes* attr in arrayOfAbsolute) {
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if (lastX < attr.frame.origin.x+attr.frame.size.width) {
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lastX = attr.frame.origin.x+attr.frame.size.width;
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}
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}
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}
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} else {
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lastX = attributes.frame.origin.x + attributes.frame.size.width;
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}
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}
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free(columnWidths);
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}
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if (self.layoutType == ClosedLayout) {
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if (itemCount > 0) {
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lastX -= minimumLineSpacing;
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}
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}
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if (itemCount > 0) {
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lastX += edgeInsets.right;
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}
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// 添加页脚属性
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if (footerW > 0) {
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NSIndexPath *footerIndexPath = [NSIndexPath indexPathForItem:0 inSection:index];
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ZLCollectionViewLayoutAttributes *footerAttr = [ZLCollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionFooter withIndexPath:footerIndexPath];
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footerAttr.frame = CGRectMake(lastX, 0, footerW, self.collectionView.frame.size.height);
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[self.attributesArray addObject:footerAttr];
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lastX += footerW;
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}
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#pragma mark 添加背景视图
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CGFloat backWidth = lastX-itemStartX+([self isAttachToTop:index]?headerW:0)-([self isAttachToBottom:index]?0:footerW);
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if (backWidth < 0) {
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backWidth = 0;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:registerBackView:)]) {
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NSString* className = [self.delegate collectionView:self.collectionView layout:self registerBackView:index];
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if (className != nil && className.length > 0) {
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ZLCollectionViewBackgroundViewLayoutAttributes *attr = [ZLCollectionViewBackgroundViewLayoutAttributes layoutAttributesForDecorationViewOfKind:className withIndexPath:[NSIndexPath indexPathForRow:0 inSection:index]];
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attr.frame = CGRectMake([self isAttachToTop:index]?itemStartX-headerW:itemStartX, 0, backWidth, self.collectionView.frame.size.height);
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attr.zIndex = -1000;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:backgroundViewMethodForSection:)]) {
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if ([self.delegate collectionView:self.collectionView layout:self backgroundViewMethodForSection:index] != nil) {
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[attr callMethod:[self.delegate collectionView:self.collectionView layout:self backgroundViewMethodForSection:index]];
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}
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}
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[self.attributesArray addObject:attr];
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} else {
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ZLCollectionViewLayoutAttributes *attr = [ZLCollectionViewLayoutAttributes layoutAttributesForDecorationViewOfKind:@"ZLCollectionReusableView" withIndexPath:[NSIndexPath indexPathForRow:0 inSection:index]];
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attr.frame = CGRectMake([self isAttachToTop:index]?itemStartX-headerW:itemStartX, 0, backWidth, self.collectionView.frame.size.height);
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attr.color = self.collectionView.backgroundColor;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:backColorForSection:)]) {
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attr.color = [self.delegate collectionView:self.collectionView layout:self backColorForSection:index];
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:backImageForSection:)]) {
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attr.image = [self.delegate collectionView:self.collectionView layout:self backImageForSection:index];
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}
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attr.zIndex = -1000;
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[self.attributesArray addObject:attr];
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}
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} else {
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ZLCollectionViewLayoutAttributes *attr = [ZLCollectionViewLayoutAttributes layoutAttributesForDecorationViewOfKind:@"ZLCollectionReusableView" withIndexPath:[NSIndexPath indexPathForRow:0 inSection:index]];
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attr.frame = CGRectMake([self isAttachToTop:index]?itemStartX-headerW:itemStartX, 0, backWidth, self.collectionView.frame.size.height);
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attr.color = self.collectionView.backgroundColor;
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:backColorForSection:)]) {
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attr.color = [self.delegate collectionView:self.collectionView layout:self backColorForSection:index];
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:backImageForSection:)]) {
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attr.image = [self.delegate collectionView:self.collectionView layout:self backImageForSection:index];
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}
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attr.zIndex = -1000;
|
|||
|
|
[self.attributesArray addObject:attr];
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
self.collectionHeightsArray[index] = [NSNumber numberWithFloat:lastX];
|
|||
|
|
}
|
|||
|
|
[self forceSetIsNeedReCalculateAllLayout:NO];
|
|||
|
|
// for (int i=0; i<self.attributesArray.count; i++) {
|
|||
|
|
// ZLCollectionViewLayoutAttributes* attr = self.attributesArray[i];
|
|||
|
|
// NSLog(@"第%d个-----%@",i,NSStringFromCGRect(attr.frame));
|
|||
|
|
// }
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#pragma mark - CollectionView的滚动范围
|
|||
|
|
- (CGSize)collectionViewContentSize
|
|||
|
|
{
|
|||
|
|
if (self.collectionHeightsArray.count <= 0) {
|
|||
|
|
return CGSizeMake(self.collectionView.frame.size.width, self.collectionView.frame.size.height);
|
|||
|
|
}
|
|||
|
|
CGFloat footerW = 0.0f;
|
|||
|
|
if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:referenceSizeForFooterInSection:)]) {
|
|||
|
|
footerW = [self.delegate collectionView:self.collectionView layout:self referenceSizeForFooterInSection:self.collectionHeightsArray.count-1].width;
|
|||
|
|
} else {
|
|||
|
|
footerW = self.footerReferenceSize.width;
|
|||
|
|
}
|
|||
|
|
UIEdgeInsets edgeInsets = UIEdgeInsetsZero;
|
|||
|
|
if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:insetForSectionAtIndex:)]) {
|
|||
|
|
edgeInsets = [self.delegate collectionView:self.collectionView layout:self insetForSectionAtIndex:self.collectionHeightsArray.count-1];
|
|||
|
|
} else {
|
|||
|
|
edgeInsets = self.sectionInset;
|
|||
|
|
}
|
|||
|
|
return CGSizeMake([self.collectionHeightsArray[self.collectionHeightsArray.count-1] floatValue], self.collectionView.frame.size.height);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
每个区的初始X坐标
|
|||
|
|
@param section 区索引
|
|||
|
|
@return Y坐标
|
|||
|
|
*/
|
|||
|
|
- (CGFloat)maxHeightWithSection:(NSInteger)section {
|
|||
|
|
if (section>0) {
|
|||
|
|
return [self.collectionHeightsArray[section-1] floatValue];
|
|||
|
|
} else {
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
- (BOOL)isAttachToTop:(NSInteger)section {
|
|||
|
|
if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:attachToTop:)]) {
|
|||
|
|
return [self.delegate collectionView:self.collectionView layout:self attachToTop:section];
|
|||
|
|
}
|
|||
|
|
return NO;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
- (BOOL)isAttachToBottom:(NSInteger)section {
|
|||
|
|
if (self.delegate && [self.delegate respondsToSelector:@selector(collectionView:layout:attachToBottom:)]) {
|
|||
|
|
return [self.delegate collectionView:self.collectionView layout:self attachToBottom:section];
|
|||
|
|
}
|
|||
|
|
return NO;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@end
|