1、先获取图片，获取高度
2、给model赋值，刷新tableView，重新加载图片；
#import "ViewController.h"
#import "ItemCell.h"
#import "ItemModel.h"
#import"SDWebImage/UIImageView+WebCache.h"
#import"CHTCollectionViewWaterfallLayout.h"
@interface ViewController ()@property (weak, nonatomic) IBOutlet UICollectionView *collectionView;
@property (nonatomic, strong) NSMutableArray *dataArray;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = @"瀑布流";
[self initData];
CHTCollectionViewWaterfallLayout *layout = [[CHTCollectionViewWaterfallLayout alloc] init];
layout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);
// layout.headerHeight = 15;
// layout.footerHeight = 10;
// layout.minimumColumnSpacing = 20;
// layout.minimumInteritemSpacing = 30;
self.collectionView.collectionViewLayout = layout;
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
self.collectionView.backgroundColor = [UIColor whiteColor];
[self.collectionView registerClass:[ItemCell class] forCellWithReuseIdentifier:@"item"];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[self updateLayoutForOrientation:[UIApplication sharedApplication].statusBarOrientation];
}
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
[super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
[self updateLayoutForOrientation:toInterfaceOrientation];
}
- (void)updateLayoutForOrientation:(UIInterfaceOrientation)orientation {
CHTCollectionViewWaterfallLayout *layout =
(CHTCollectionViewWaterfallLayout *)self.collectionView.collectionViewLayout;
layout.columnCount = UIInterfaceOrientationIsPortrait(orientation) ? 2 : 3;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)initData {
NSArray *imageArray = @[
@"http://g.hiphotos.baidu.com/image/w%3D310/sign=6f9ce22079ec54e741ec1c1f89399bfd/9d82d158ccbf6c81cea943f6be3eb13533fa4015.jpg",
@"http://b.hiphotos.baidu.com/image/pic/item/4bed2e738bd4b31cc6476eb985d6277f9e2ff8bd.jpg",
@"http://c.hiphotos.baidu.com/image/pic/item/94cad1c8a786c9174d18e030cb3d70cf3bc7579b.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=79bc1b1a950a304e5222a6fbe1c9a7c3/d1160924ab18972b50a46fd4e4cd7b899e510a15.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=05e2c867272dd42a5f0907aa333a5b2f/7dd98d1001e93901f3f7103079ec54e737d196c3.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=3914596cf1deb48ffb69a7dfc01e3aef/d0c8a786c9177f3ea3e73f0072cf3bc79e3d56e8.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=8cc67b8cc91349547e1eee65664e92dd/4610b912c8fcc3ce11e40a3e9045d688d43f2093.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=93e1c429952bd40742c7d5fc4b889e9c/3812b31bb051f8191cdd594bd8b44aed2e73e733.jpg",
@"http://b.hiphotos.baidu.com/image/pic/item/4bed2e738bd4b31cc6476eb985d6277f9e2ff8bd.jpg",
@"http://c.hiphotos.baidu.com/image/pic/item/94cad1c8a786c9174d18e030cb3d70cf3bc7579b.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=3914596cf1deb48ffb69a7dfc01e3aef/d0c8a786c9177f3ea3e73f0072cf3bc79e3d56e8.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=93e1c429952bd40742c7d5fc4b889e9c/3812b31bb051f8191cdd594bd8b44aed2e73e733.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=d4507def9d3df8dca63d8990fd1072bf/d833c895d143ad4b758c35d880025aafa40f0603.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=702acce2552c11dfded1b92253266255/d62a6059252dd42a3ac70aaa013b5bb5c8eab8e0.jpg",
@"http://h.hiphotos.baidu.com/image/w%3D310/sign=75ff59cd19d5ad6eaaf962ebb1ca39a3/b64543a98226cffcb9f3ddbbbb014a90f703eada.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=11386163f1deb48ffb69a7dfc01e3aef/d0c8a786c9177f3e8bcb070f72cf3bc79f3d5631.jpg",
@"http://f.hiphotos.baidu.com/image/w%3D310/sign=8ed508bbd358ccbf1bbcb33b29d8bcd4/8694a4c27d1ed21b33ff8fecaf6eddc451da3f80.jpg",
@"http://b.hiphotos.baidu.com/image/w%3D310/sign=ad40ca82c9ef76093c0b9f9e1edca301/5d6034a85edf8db16aa7b27b0b23dd54564e7420.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=79bc1b1a950a304e5222a6fbe1c9a7c3/d1160924ab18972b50a46fd4e4cd7b899e510a15.jpg",
@"http://c.hiphotos.baidu.com/image/w%3D310/sign=05e2c867272dd42a5f0907aa333a5b2f/7dd98d1001e93901f3f7103079ec54e737d196c3.jpg",
@"http://g.hiphotos.baidu.com/image/w%3D310/sign=6f9ce22079ec54e741ec1c1f89399bfd/9d82d158ccbf6c81cea943f6be3eb13533fa4015.jpg",
@"http://e.hiphotos.baidu.com/image/w%3D310/sign=79bc1b1a950a304e5222a6fbe1c9a7c3/d1160924ab18972b50a46fd4e4cd7b899e510a15.jpg"
];
self.dataArray = [NSMutableArray array];
for (NSString *item in imageArray) {
ItemModel *model = [ItemModel new];
model.imageUrl = item;
[self.dataArray addObject:model];
}
}
#pragma mark - UICollectionView Delegate
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return self.dataArray.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
ItemCell *cell = (ItemCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"item"
forIndexPath:indexPath];
ItemModel *model = [self.dataArray objectAtIndex:indexPath.row];
NSString *imgUrlString = model.imageUrl;
[cell.imageView sd_setImageWithURL:[NSURL URLWithString:imgUrlString] placeholderImage:[UIImage imageNamed:@"loading"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
if (image) {
if (!CGSizeEqualToSize(model.imageSize, image.size)) {
model.imageSize = image.size;
[collectionView reloadItemsAtIndexPaths:@[indexPath]];
}
}
}];
return cell;
}
#pragma mark - CHTCollectionViewDelegateWaterfallLayout
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
ItemModel *model = [self.dataArray objectAtIndex:indexPath.row];
if (!CGSizeEqualToSize(model.imageSize, CGSizeZero)) {
return model.imageSize;
}
return CGSizeMake(150, 150);
}
@end
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