collection实现电子相册预览可以放到效果

转自:https://github.com/fuzongjian/FZJPhotosFrameWork

#import "FZJBigPhotoController.h"

#import "FZJBigPhotoCell.h"

/**

 * 宏定义间距

 */

#define margin 30

@interface FZJBigPhotoController ()<UICollectionViewDataSource,UICollectionViewDelegate,UIScrollViewDelegate>

/**

 *  大图展示以供选择

 */

@property(nonatomic,strong)UICollectionView * bigCollect;

/**

 *  展示当前选择照片的动态

 */

@property(nonatomic,strong)UILabel * middle;

/**

 *  导航栏右侧的按钮

 */

@property(nonatomic,strong)UIButtonExt * selectStatus;

/**

 *  中间的标题

 */

@property(nonatomic,strong)UILabel * titleLable;

@end

@implementation FZJBigPhotoController

-(void)viewWillAppear:(BOOL)animated{

    [super viewWillAppear:YES];

    [self.bigCollect setContentOffset:CGPointMake((self.fetchResult.count - 1 - self.clickNum) * (SCREEN_WIDTH + margin), 0)];

}

-(void)viewDidLoad{

    [super viewDidLoad];

    [self configBigPhotoControllerUI];

}

#pragma mark --

#pragma mark 初始化UI

-(void)configBigPhotoControllerUI{

    

    self.view.backgroundColor = [UIColor whiteColor];

    self.automaticallyAdjustsScrollViewInsets = NO;

    

    UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc]init];

    flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

    flowLayout.minimumLineSpacing = margin;

    flowLayout.sectionInset = UIEdgeInsetsMake(0, margin/2, 0, margin/2);

    flowLayout.itemSize = self.view.size;

    

    _bigCollect = [[UICollectionView alloc] initWithFrame:CGRectMake(-margin/2, 0, SCREEN_WIDTH + margin, SCREEN_HEIGHT) collectionViewLayout:flowLayout];

    [_bigCollect registerNib:[UINib nibWithNibName:@"FZJBigPhotoCell" bundle:nil] forCellWithReuseIdentifier:@"BigPhotoCell"];

     _bigCollect.pagingEnabled = YES;

    _bigCollect.dataSource = self;

    _bigCollect.delegate = self;

    [self.view addSubview:_bigCollect];

    

    UIButtonExt * quit = [UIButtonExt buttonWithType:UIButtonTypeCustom];

    [quit setBackgroundImage:[UIImage imageNamed:@"No"] forState:UIControlStateNormal];

    [quit setBackgroundImage:[UIImage imageNamed:@"AssetsPickerChecked"] forState:UIControlStateSelected];

    quit.frame = CGRectMake(0, 0, 30, 30);

    [quit addTarget:self action:@selector(selectStatus:) forControlEvents:UIControlEventTouchUpInside];

    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:quit];

    _selectStatus = quit;

    

    

    UILabel * titleLable = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];

    titleLable.text = [NSString stringWithFormat:@"%d/%d",(int)self.clickNum,(int)self.fetchResult.count];

    _titleLable = titleLable;

    titleLable.textAlignment = NSTextAlignmentCenter;

    self.navigationItem.titleView = titleLable;

    

}

#pragma mark--

#pragma mark 数据请求

#pragma mark--

#pragma mark 数据加载

#pragma mark--

#pragma mark 事件

#pragma mark ---  大图浏览对图片的增删改查

-(void)selectStatus:(UIButtonExt *)select{

    select.selected = !select.selected;

    if (select.selected) {

        if (self.ChooseArr.count == self.addNum) {

            [SVProgressHUD showErrorWithStatus:[NSString stringWithFormat:@"本次最多选择%d张",(int)self.addNum]];

            select.selected = NO;

        }else{

            FZJPhotoModel * model = [[FZJPhotoModel alloc]init];

            model.asset = self.fetchResult[select.index];

            model.imageName = [self.fetchResult[select.index] valueForKey:@"filename"];

            [self.ChooseArr addObject:model];

        }

    }else{

        for (FZJPhotoModel * model in self.ChooseArr) {

            if ([model.imageName isEqualToString:[self.fetchResult[select.index] valueForKey:@"filename"]]) {

                [self.ChooseArr removeObject:model];

                break;

            }

        }

    }

}

#pragma mark ---  重写父类返回按钮点击事件

-(void)SuperBackBtnClicked{

    

    if (self.chooseState) {

        if (self.rootBlock) {

            self.rootBlock(self.ChooseArr);

        }

        [self.navigationController popToRootViewControllerAnimated:YES];

    }else{

        if (self.returnBlock && self.ChooseArr.count) {

            self.returnBlock(self.ChooseArr);

        }

         [self.navigationController popViewControllerAnimated:YES];

    }

}

-(void)returnBack:(returnBackPhotoArr)block{

    self.returnBlock = block;

}

-(void)returnToRoot:(returnBackPhotoArr)rootBlock{

    self.rootBlock = rootBlock;

}

#pragma mark--

#pragma mark  代理

#pragma mark --- collectionView 代理

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{

    return 1;

}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

    return self.fetchResult.count;

}

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

    FZJBigPhotoCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"BigPhotoCell" forIndexPath:indexPath];

    cell.ImageView.image = nil;

    self.selectStatus.selected = NO;

    self.selectStatus.index = indexPath.row;

    CGFloat scale = [UIScreen mainScreen].scale;

    PHAsset * asset = self.fetchResult[indexPath.row];

    [cell showIndicator];

    [[FZJPhotoTool defaultFZJPhotoTool] getImageByAsset:asset makeSize:CGSizeMake(asset.pixelWidth * scale, asset.pixelHeight * scale) makeResizeMode:PHImageRequestOptionsResizeModeNone completion:^(UIImage *AssetImage) {

        cell.ImageView.image = AssetImage;

        [cell hideIndicator];

    }];

    for (FZJPhotoModel * model in self.ChooseArr) {

        if ([model.imageName isEqualToString:[self.fetchResult[indexPath.row] valueForKey:@"filename"]]) {

            self.selectStatus.selected = YES;

        }

    }

    cell.ScrollView.delegate = self;

    [self addGestureTapToScrollView:cell.ScrollView];

    return cell;

}

#pragma mark --- ScrollView 代理

/**

 *  动态改变图片展示的状态

 *

 *  @param scrollView 当前的_bigCollect

 */

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

    if (scrollView == (UIScrollView *)_bigCollect) {//UICollectionView是继承于UIScrollView的

        CGFloat current = scrollView.contentOffset.x / (SCREEN_WIDTH + margin) + 1;

        _titleLable.text = [NSString stringWithFormat:@"%.f/%d",current,(int)self.fetchResult.count];

    }

}

/**

 *  即将出现的不被方法或者缩小的视图

 *

 *  @param cell           将要出现的Cell

 *  @param indexPath      cell在数据源中得位置

 */

-(void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath{

    FZJBigPhotoCell * WillCell = (FZJBigPhotoCell *)cell;

    WillCell.ScrollView.zoomScale = 1;

}

/**

 *  返回的是图片的视图

 *

 *  @param scrollView 当前的scrollView

 *

 *  @return 返回一个放大或缩小的视图

 */

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{

    return scrollView.subviews[0];

}

#pragma mark ---  scrollView 添加手势

-(void)addGestureTapToScrollView:(UIScrollView *)scrollView{

    UITapGestureRecognizer * singleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(singleTapOnScrollView:)];

    singleTap.numberOfTapsRequired = 1;

    [scrollView addGestureRecognizer:singleTap];

    

    UITapGestureRecognizer * doubleTap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTapOnScrollView:)];

    doubleTap.numberOfTapsRequired = 2;

    [scrollView addGestureRecognizer:doubleTap];

}

/**

 *  隐藏导航栏和NavgationBar

 *

 *  @param singleTap 单击

 */

-(void)singleTapOnScrollView:(UITapGestureRecognizer *)singleTap{

    if (self.navigationController.navigationBar.isHidden) {

        [self showNavBarAndStatusBar];

    }else{

        [self hideNavBarAndStatusBar];

    }

}

#pragma mark ---  隐藏或者显示导航栏

-(void)showNavBarAndStatusBar{

    self.navigationController.navigationBar.hidden = NO;

    [UIApplication sharedApplication].statusBarHidden = NO;

}

-(void)hideNavBarAndStatusBar{

    self.navigationController.navigationBar.hidden = YES;

    [UIApplication sharedApplication].statusBarHidden = YES;

}

/**

 *  放大缩小

 *

 *  @param doubleTap 双击

 */

-(void)doubleTapOnScrollView:(UITapGestureRecognizer *)doubleTap{

    

    UIScrollView * scrollView = (UIScrollView *)doubleTap.view;

    CGFloat scale = 1;

    if (scrollView.zoomScale != 3) {

        scale = 3;

    }else{

        scale = 1;

    }

    [self CGRectForScale:scale WithCenter:[doubleTap locationInView:doubleTap.view] ScrollView:scrollView Completion:^(CGRect Rect) {

        [scrollView zoomToRect:Rect animated:YES];

    }];

}

-(void)CGRectForScale:(CGFloat)scale WithCenter:(CGPoint)center ScrollView:(UIScrollView *)scrollView Completion:(void(^)(CGRect Rect))completion{

    CGRect Rect;

    Rect.size.height = scrollView.frame.size.height / scale;

    Rect.size.width  = scrollView.frame.size.width  / scale;

    Rect.origin.x    = center.x - (Rect.size.width  /2.0);

    Rect.origin.y    = center.y - (Rect.size.height /2.0);

    completion(Rect);

}