ImageBrown

图片选择器，浏览图片支持网络图片与本地图片共存

前言

首先我要声明的是：这个demo是本人把TZImagePickerController（选择本地图片）与 XLPhotoBrowser（图片浏览）这两个强大的神器简单修改、结合而成，感谢两位大神的无私贡献。
这两个demo的具体用法和详细介绍，还请大家自己前去查看，这里就不一一讲解了，另TZImagePickerController支持选择原图和本地视频，这里给屏蔽掉了，你可根据自己项目需求自己进行修改。XLPhotoBrowser这里也只用到其中的一种浏览方式。

本人才疏学浅，本demo只是简单展示，望能者勿喷。

下面列出主要代码，欢迎下载、欢迎指导、欢迎star。

一、初始化CollectionView

- (void)initCollectionView {
    _margin = 5;
    _itemWH = (SCREEN_WIDTH - 12*2 - 5*3)/4;
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(_itemWH, _itemWH);
    layout.minimumInteritemSpacing = 0;
    layout.minimumLineSpacing = _margin;
    _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(12, 10, SCREEN_WIDTH - 24, 300) collectionViewLayout:layout];
    _collectionView.alwaysBounceVertical = YES;
    _collectionView.scrollEnabled = NO;
    _collectionView.backgroundColor = [UIColor whiteColor];
    _collectionView.dataSource = self;
    _collectionView.delegate = self;
    _collectionView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
    [self.view addSubview:_collectionView];

    [_collectionView registerClass:[CollectionCell class] forCellWithReuseIdentifier:@"CollectionCell"];
}

二、处理CollectinView代理、数据源及图片点击事件

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return _selectedAllPhotos.count + 1;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    CollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionCell" forIndexPath:indexPath];
    if (indexPath.row == _selectedAllPhotos.count) {
        cell.asset = @"tjtp-icon";
        cell.deleteBtn.hidden = YES;
    }
    else {
        cell.asset = _selectedAllPhotos[indexPath.row];
        cell.deleteBtn.hidden = NO;
    }

    //设置封面
    if (_selectedAllPhotos.count > 0) {
        if (coverIndex == indexPath.row) {
            cell.coverLabel.hidden = NO;
        }
        else {
            cell.coverLabel.hidden = YES;
        }
    }
    else {
        cell.coverLabel.hidden = YES;
    }
    cell.deleteBtn.tag = indexPath.row;
    [cell.deleteBtn addTarget:self action:@selector(deleteBtnAction:) forControlEvents:UIControlEventTouchUpInside];
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (_selectedAllPhotos.count > 0) {
        //添加图片
        if (indexPath.row == _selectedAllPhotos.count) {
            [self pushImagePickerController];
        }
        else {//浏览大图
            XLPhotoBrowser *browser = [XLPhotoBrowser showPhotoBrowserWithImages:_selectedAllPhotos currentImageIndex:indexPath.row];
            browser.delegate = self;
            browser.currentPageDotColor = [UIColor greenColor];
            browser.pageControlStyle = XLPhotoBrowserPageControlStyleAnimated;//pagecontrol的样式为弹性动画的样式
        }
    }
    //添加图片
    else {
        [self pushImagePickerController];
    }
}

//选择本地照片
- (void)pushImagePickerController {
    TZImagePickerController *imagePickerVc = [[TZImagePickerController alloc] initWithMaxImagesCount:7 - _netImageUrlArray.count columnNumber:4 delegate:self pushPhotoPickerVc:YES];
    imagePickerVc.isSelectOriginalPhoto = NO;//是否允许选择高清图
    imagePickerVc.selectedAssets = _selectedAssets;//目前已经选中的图片数组
    imagePickerVc.allowTakePicture = YES;//在内部显示拍照按钮

    //设置是否可以选择视频/图片/原图
    imagePickerVc.allowPickingVideo = NO;
    imagePickerVc.allowPickingImage = YES;
    imagePickerVc.allowPickingOriginalPhoto = NO;

    //照片排列按修改时间升序
    imagePickerVc.sortAscendingByModificationDate = YES;
    imagePickerVc.alwaysEnableDoneBtn = YES;//无图片时完成按钮依然可点
    imagePickerVc.showSelectBtn = YES;
    imagePickerVc.circleCropRadius = 100;
    imagePickerVc.allowPreview = YES;

    //回调选择的照片.
    [imagePickerVc setDidFinishPickingPhotosHandle:^(NSArray<UIImage *> *photos, NSArray *assets, BOOL isSelectOriginalPhoto) {
        _selectedAssets = [NSMutableArray arrayWithArray:assets];
        _selectedPhotos = [NSMutableArray arrayWithArray:photos];
        [_selectedAllPhotos removeAllObjects];
        [_selectedAllPhotos addObjectsFromArray:_netImageUrlArray];
        [_selectedAllPhotos addObjectsFromArray:_selectedPhotos];
        [_collectionView reloadData];
    }];

    [self presentViewController:imagePickerVc animated:YES completion:nil];
}

三、删除图片

//删除按钮点击事件
- (void)deleteBtnAction:(UIButton *)button {
    //有网络图片时
    if (_netImageUrlArray.count > 0) {
        //删除的是网络图片
        if (button.tag <= _netImageUrlArray.count - 1) {
            [_netImageUrlArray removeObjectAtIndex:button.tag];
        }
        //删除的是本地图片
        else {
            [_selectedPhotos removeObjectAtIndex:button.tag - _netImageUrlArray.count];
            [_selectedAssets removeObjectAtIndex:button.tag - _netImageUrlArray.count];
        }
    }
    //没有网络图片，删除的任何一个都是本地图片
    else {
        [_selectedPhotos removeObjectAtIndex:button.tag];
        [_selectedAssets removeObjectAtIndex:button.tag];
    }
    //如果删除的是封面图片，第一张图片变为封面
    if (button.tag == coverIndex) {
        coverIndex = 0;
    }
    else {
        if (button.tag < coverIndex) {
            -- coverIndex;
        }
    }
    [_selectedAllPhotos removeAllObjects];
    [_selectedAllPhotos addObjectsFromArray:_netImageUrlArray];
    [_selectedAllPhotos addObjectsFromArray:_selectedPhotos];
    [_collectionView reloadData];
}

四、用作封面代理回调，刷新CollectionView

- (void)UsageCoverWithCurrentImageIndex:(NSInteger)currentImageIndex{
    coverIndex = (int)currentImageIndex;
    [_collectionView reloadData];
}