SDWEBImage和collectionView的组合，以及collectionView的随意间距设置
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#import "ViewController.h" #import <ImageIO/ImageIO.h> #import "UIImageView+WebCache.h" @interface ViewController ()<UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout> // 数据源 @property (nonatomic, strong)NSMutableArray *arrIcon; // 显示控件 @property (nonatomic, strong)UICollectionView *clv; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; // 获取数据源写成，url写成plist文件 /* [[NSArray arrayWithObjects: @"http://image.tianjimedia.com/uploadImages/2012/273/M6J97CZGYA4Z_NatGeo01_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/J3ME8ZNAG315_NatGeo02_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/EL9230AP5196_NatGeo03_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/SYJ43SG47PC8_NatGeo04_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/605X52620G0M_NatGeo05_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/7H5RQ1ELP8MZ_NatGeo06_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/Z2W429E0203R_NatGeo07_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/BG011W9LWL77_NatGeo08_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/936FM8NN22J2_NatGeo09_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/H79633PPEFZW_NatGeo10_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/54Z01YZ78050_NatGeo11_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/61V3658UA4IY_NatGeo12_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/H3HL7YILNGKB_NatGeo13_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/1V6797311ZA5_NatGeo14_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/93L81IKN156R_NatGeo15_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/V93E1EGU2G0Z_NatGeo16_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/QC205CD96IWZ_NatGeo17_250.jpg",@"http://image.tianjimedia.com/uploadImages/2012/273/M6J97CZGYA4Z_NatGeo01_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/J3ME8ZNAG315_NatGeo02_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/EL9230AP5196_NatGeo03_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/SYJ43SG47PC8_NatGeo04_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/605X52620G0M_NatGeo05_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/7H5RQ1ELP8MZ_NatGeo06_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/Z2W429E0203R_NatGeo07_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/BG011W9LWL77_NatGeo08_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/936FM8NN22J2_NatGeo09_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/H79633PPEFZW_NatGeo10_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/54Z01YZ78050_NatGeo11_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/61V3658UA4IY_NatGeo12_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/H3HL7YILNGKB_NatGeo13_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/1V6797311ZA5_NatGeo14_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/93L81IKN156R_NatGeo15_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/V93E1EGU2G0Z_NatGeo16_250.jpg", @"http://image.tianjimedia.com/uploadImages/2012/273/QC205CD96IWZ_NatGeo17_250.jpg", nil] writeToFile:@"/Users/Mu/Desktop/pic.plist" atomically:YES]; */ self.arrIcon = [NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"pic" ofType:@"plist"]]; // 设置滚动方向：FlowLayout简单说是一个直线对齐的layout UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; // 滚动方向 layout.scrollDirection = UICollectionViewScrollDirectionVertical; // 尾部距离屏幕尺寸（竖直模式，x没有作用） layout.headerReferenceSize = CGSizeMake(0, 30); //头部尺寸 layout.footerReferenceSize = CGSizeMake(0, 100); //尾部尺寸 // 缩进：和屏幕上下以及相对于屏幕的左右间距（上左下右）：左右会影响到竖直间距 // 默认是10：终于可以改变了 layout.sectionInset = UIEdgeInsetsMake(1, 0, 1, 0); // 设置图片的尺寸 //layout.itemSize = CGSizeMake(WID/4.0-1, WID/4.0-1); //layout.itemSize = CGSizeMake((WID-30)/4.0, (WID-30)/4.0); // 目前发现：预估尺寸等效于于itemSize layout.estimatedItemSize = CGSizeMake(WID/4.0-1, WID/4.0-1); // 前提minimumInteritemSpacing为0（默认为10） layout.minimumInteritemSpacing = 0; // 行间距（竖直模式） layout.minimumLineSpacing = 1; // 设置页眉和页脚是否一直存在 layout.sectionHeadersPinToVisibleBounds= NO; // 创建对象 self.clv = [[UICollectionView alloc] initWithFrame:self.view.frame collectionViewLayout:layout]; // 指定代理 self.clv.delegate = self; self.clv.dataSource = self; // 注册唯一标识 [self.clv registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"reuse"]; [self.clv registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"headReuse"]; [self.clv registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footReuse"]; // 添加到主视图 [self.view addSubview:self.clv]; self.clv.backgroundColor = [UIColor whiteColor]; // 设置偏移量，隐藏UISegmentedControl self.clv.contentOffset = CGPointMake(0, 30); } #pragma - UICollectionViewDataSource - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { [self.arrIcon addObject:[NSNull null]]; [self.arrIcon addObject:[NSNull null]]; return self.arrIcon.count; } // 首先是cell本身作为容器view\ 然后是一个大小自动适应整个cell的backgroundView，用作cell平时的背景 再其上是selectedBackgroundView，是cell被选中时的背景 最后是一个contentView，自定义内容应被加在这个view上 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { // 重用队列标识 UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"reuse" forIndexPath:indexPath]; // 第三方Image请求 UIImageView *imv = [[UIImageView alloc] init]; [imv sd_setImageWithURL:self.arrIcon[indexPath.row] placeholderImage:[UIImage imageNamed:@"u=2312994427,1092373000&fm=21&gp=0.jpg"] options:SDWebImageRetryFailed]; cell.backgroundView = imv; // 选中更换背景图_1（点击选中即更换） //cell.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Img361868872.jpg"]]; return cell; } // 页眉和页脚出现即调用；页眉要第二次出现才会调用 // Supplementary Views 追加视图 如果你对UITableView比较熟悉的话，可以理解为每个Section的Header或者Footer，用来标记每个section的view - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { if (kind == UICollectionElementKindSectionHeader) { // 重用标识 UICollectionReusableView *ppView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"headReuse" forIndexPath:indexPath]; ppView.backgroundColor = [UIColor clearColor]; // 添加子控件 UISegmentedControl *sgmc = [[UISegmentedControl alloc] initWithItems:@[@"名称", @"日期", @"大小"]]; sgmc.tintColor = [UIColor purpleColor]; sgmc.bounds = CGRectMake(0, 0, 100, 15); sgmc.center = ppView.center; [ppView addSubview:sgmc]; return ppView; }else { // 重用标识 UICollectionReusableView *ppView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"footReuse" forIndexPath:indexPath]; ppView.backgroundColor = [UIColor clearColor]; // 添加数量和时间 UILabel *lbl = [[UILabel alloc] init]; lbl.numberOfLines = 2; lbl.textAlignment = NSTextAlignmentCenter; lbl.frame = CGRectMake((WID-200)/2, 35, 200, 30); lbl.font = [UIFont systemFontOfSize:10]; NSDate *date = [NSDate date]; NSTimeZone *zone = [NSTimeZone systemTimeZone]; NSInteger seconds = [zone secondsFromGMTForDate:date]; NSDate *now = [date dateByAddingTimeInterval:seconds]; // 格式化NSDate为NSString：会自动添加28800s即等于now NSDateFormatter *fm = [NSDateFormatter new]; fm.dateFormat = @"yyyy年MM月dd日HH时mm分ss秒"; // 需要取子串 NSString *time = [[fm stringFromDate:date] substringFromIndex:11]; NSString *num = [NSString stringWithFormat:@"%lu张照片", self.arrIcon.count]; lbl.text = [NSString stringWithFormat:@"%@\r\n%@", num, time]; [ppView addSubview:lbl]; NSLog(@"等效：%@；%@", now, [fm stringFromDate:date]); return ppView; } } // 对于Decoration Views，提供方法并不在UICollectionViewDataSource中，而是直接UICollectionViewLayout类中的(因为它仅仅是视图相关，而与数据无关) // 选中跟换背景图_2（长按更换松开恢复） // 需要允许为YES，不然走发哦这里就停了不会执行didHighlightItemAtIndexPath - (BOOL)collectionView:(UICollectionView *)collectionView shouldHighlightItemAtIndexPath:(NSIndexPath *)indexPath { return YES; } - (void)collectionView:(UICollectionView *)colView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath { // 没有创建新对象：使用的还是indexPath队列的cell UICollectionViewCell* cell = [colView cellForItemAtIndexPath:indexPath]; cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Img361868872.jpg"]]; } - (void)collectionView:(UICollectionView *)collectionView didUnhighlightItemAtIndexPath:(NSIndexPath *)indexPath { // 没有创建新对象：使用的还是indexPath队列的cell UICollectionViewCell* cell = [collectionView cellForItemAtIndexPath:indexPath]; UIImageView *imv = [[UIImageView alloc] init]; [imv sd_setImageWithURL:self.arrIcon[indexPath.row] placeholderImage:[UIImage imageNamed:@"u=2312994427,1092373000&fm=21&gp=0.jpg"] options:SDWebImageRetryFailed]; cell.backgroundView = imv; }UIImageView *imv; // 选中 - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"%lu", indexPath.row); } @end
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