效果
源码：https://github.com/YouXianMing/Animations
// // GridFlowLayoutViewController.m // Animations // // Created by YouXianMing on 16/5/5. // Copyright © 2016年 YouXianMing. All rights reserved. // #import "GridFlowLayoutViewController.h" #import "UIView+SetRect.h" #import "GridLayout.h" #import "FlowStyleCell.h" #import "FileManager.h" #import "NSString+MD5.h" #import "NSData+JSONData.h" #import "ResponseData.h" #import "Math.h" #import "GCD.h" static NSString *picturesSource = @"http://www.duitang.com/album/1733789/masn/p/0/50/"; @interface GridFlowLayoutViewController () <UICollectionViewDataSource, UICollectionViewDelegate, GridLayoutDelegate> @property (nonatomic, strong) UICollectionView *collectionView; @property (nonatomic) CGFloat rowHeight; @property (nonatomic, strong) NSMutableArray *datas; @property (nonatomic, strong) ResponseData *picturesData; @property (nonatomic, strong) NSMutableArray <WaterfallPictureModel *> *dataSource; @end @implementation GridFlowLayoutViewController - (void)setup { [super setup]; _dataSource = [NSMutableArray new]; // 初始化布局文件 CGFloat gap = 1; NSInteger rowCount = arc4random() % 3 + 2; _rowHeight = (self.contentView.height - (rowCount + 1) * gap) / (CGFloat)rowCount; GridLayout *layout = [GridLayout new]; layout.manager.edgeInsets = UIEdgeInsetsMake(gap, gap, gap, gap); layout.manager.gap = gap; layout.delegate = self; NSMutableArray *rowHeights = [NSMutableArray array]; for (int i = 0; i < rowCount; i++) { [rowHeights addObject:@(_rowHeight)]; } layout.manager.rowHeights = rowHeights; self.collectionView = [[UICollectionView alloc] initWithFrame:self.contentView.bounds collectionViewLayout:layout]; self.collectionView.delegate = self; self.collectionView.dataSource = self; self.collectionView.backgroundColor = [UIColor clearColor]; self.collectionView.showsHorizontalScrollIndicator = NO; self.collectionView.alpha = 0; [self.collectionView registerClass:[FlowStyleCell class] forCellWithReuseIdentifier:@"FlowStyleCell"]; [self.contentView addSubview:self.collectionView]; // 获取数据 [GCDQueue executeInGlobalQueue:^{ NSString *string = [picturesSource lowerMD532BitString]; NSString *realFilePath = [FileManager theRealFilePath:[NSString stringWithFormat:@"~/Documents/%@", string]]; NSData *data = nil; if ([FileManager fileExistWithRealFilePath:realFilePath] == NO) { data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:picturesSource]]; [data writeToFile:realFilePath atomically:YES]; } else { data = [NSData dataWithContentsOfFile:realFilePath]; } NSDictionary *dataDic = [data toListProperty]; [GCDQueue executeInMainQueue:^{ self.picturesData = [[ResponseData alloc] initWithDictionary:dataDic]; if (self.picturesData.success.integerValue == 1) { for (int i = 0; i < self.picturesData.data.blogs.count; i++) { [_dataSource addObject:self.picturesData.data.blogs[i]]; } [_collectionView reloadData]; [UIView animateWithDuration:0.5f animations:^{ _collectionView.alpha = 1.f; }]; } }]; }]; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.dataSource.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { WaterfallPictureModel *pictureModel = _dataSource[indexPath.row]; FlowStyleCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"FlowStyleCell" forIndexPath:indexPath]; cell.indexPath = indexPath; cell.data = pictureModel; cell.rowHeight = _rowHeight; [cell loadContent]; return cell; } - (CGFloat)itemWidthWithIndexPath:(NSIndexPath *)indexPath { WaterfallPictureModel *pictureModel = _dataSource[indexPath.row]; return [Math resetFromSize:CGSizeMake(pictureModel.iwd.floatValue, pictureModel.iht.floatValue) withFixedHeight:_rowHeight].width; } @end
细节
继承UICollectionViewLayout
重载UICollectionViewLayout的四个方法
部分实现细节
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