iboss-ios/IBOSS/AttachmentViewController.m

//
//  AttachmentViewController.m
//  IBOSS
//
//  Created by 关宏厚 on 2018/11/15.
//  Copyright © 2018 elongtian. All rights reserved.
//

#import "AttachmentViewController.h"

@interface AttachmentViewController ()

@end

@implementation AttachmentViewController

#pragma mark - 公共函数

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor whiteColor]];
    [self initUI];
  
}
#pragma mark - 委托函数

/**
 相册collectionview每个分区的项数
 
 @param collectionView
 @param section
 @return
 */
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return  [_attachImageArray count];
}

/**
 相册加载cellectionviewcell
 
 @param collectionView
 @param indexPath
 @return
 */
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    AlbumPhotoCollectionViewCell *cell1 = [collectionView dequeueReusableCellWithReuseIdentifier:PhotoCollectionViewCellIdentifier forIndexPath:indexPath];
    
    cell1.indexPath = indexPath;
    ImageModel *image = _attachImageArray[indexPath.row];
    NSString *imagepath = [image imageName];
    imagepath=  [self returnFormatString:imagepath];
    if(imagepath != nil&&[imagepath length]>0){
        NSString *imageUrl=  [NSString stringWithFormat:@"http://%@:%@/WebService/%@",kkServerUrl,kkServerPort,imagepath];
         NSURL *url=  [NSURL URLWithString:[imageUrl stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]]];
      
        [cell1.photoImageView downloadImageWithURL:url];
    }
    return cell1;
}

#pragma mark - 私有函数

-(void)loadData:(NSMutableArray*)imageArray{
    _attachImageArray=imageArray;
    _sharePhotoCollectionView.frame=[self getPhotoFrame:_attachImageArray];
    [_sharePhotoCollectionView reloadData];
}
-(void)initUI{
    _sharePhotoCollectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:[[XHAlbumCollectionViewFlowLayout alloc] init]];
    _sharePhotoCollectionView.backgroundColor  = [UIColor clearColor];
    [_sharePhotoCollectionView registerClass:[AlbumPhotoCollectionViewCell class] forCellWithReuseIdentifier:PhotoCollectionViewCellIdentifier];
    _sharePhotoCollectionView.scrollEnabled=NO;
    _sharePhotoCollectionView.delegate = self;
    _sharePhotoCollectionView.dataSource = self;
    [self.view addSubview:_sharePhotoCollectionView];
    
    [self.sharePhotoCollectionView reloadData];
}


-(NSString *)returnFormatString:(NSString *)str

{
    
    return [str stringByReplacingOccurrencesOfString:@"\\" withString:@"/"];
    
}

/**
 图片的frame
 
 @param photoArray <#photoArray description#>
 @return <#return value description#>
 */
- (CGRect) getPhotoFrame:(NSMutableArray*)photoArray{
    CGRect photoCollectionViewFrame = CGRectMake(20,5, 5 * 4 + 85* 3, [self getPhotoCollectionViewHeightWithPhotos:photoArray]);
    return  photoCollectionViewFrame;
}

/**
 高度
 
 @param photos <#photos description#>
 @return <#return value description#>
 */
- (CGFloat)getPhotoCollectionViewHeightWithPhotos:(NSArray *)photos {
    // 上下间隔已经在frame上做了
    NSInteger row = (photos.count / 3 + (photos.count % 3 ? 1 : 0));
    return (row *85 + (row *10));
}

/**
 点击图片放大
 
 @param collectionView
 @param indexPath
 */
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    [self showImageViewerAtIndexPath:indexPath];
}

/**
 图片放大方法
 
 @param indexPath
 */
- (void)showImageViewerAtIndexPath:(NSIndexPath *)indexPath {
    AlbumPhotoCollectionViewCell *cell = (AlbumPhotoCollectionViewCell *)[self.sharePhotoCollectionView cellForItemAtIndexPath:indexPath];
    
    NSMutableArray *imageViews = [NSMutableArray array];
    NSArray *visibleCell = [self.sharePhotoCollectionView visibleCells];
    
    NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"indexPath" ascending:YES];
    
    visibleCell = [visibleCell sortedArrayUsingDescriptors:[NSArray arrayWithObject:sort]];
    
    [visibleCell enumerateObjectsUsingBlock:^(AlbumPhotoCollectionViewCell *cell, NSUInteger idx, BOOL *stop) {
        [imageViews addObject:[[cell.contentView subviews] lastObject]];
    }];
    
    XHImageViewer *imageViewer = [[XHImageViewer alloc] init];
    [imageViewer showWithImageViews:imageViews selectedView:[[cell.contentView subviews] lastObject]];
}

@end