本篇IOS应用开发教程将为大家讲解iOS-collectionView实现照片删除，看完这篇文章会让你对IOS编程的知识点有更加清晰的理解和运用。

一，效果图。

二，工程图。

三，代码。

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout,UIAlertViewDelegate,UIActionSheetDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

{

    UICollectionView *_collectionView;

    UIImagePickerController *_imagePicker;

    NSMutableArray *photos;

    NSMutableArray *dataArray;

    NSInteger deleteIndex;

    BOOL wobble;

}@end

ViewController.m

//点击添加按钮的时候，停止删除。#import "ViewController.h"#import "photoCollectionViewCell.h"

NSInteger const Photo = 8;

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //其布局很有意思，当你的cell设置大小后，一行多少个cell，由cell的宽度决定

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

    //设置cell的尺寸

    [flowLayout setItemSize:CGSizeMake(70, 70)];

    //设置其布局方向    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];

    //设置其边界(上，左，下，右）

    flowLayout.sectionInset = UIEdgeInsetsMake(5,5,5,5);

    _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(10, 50, 320,85*2) collectionViewLayout:flowLayout];

    _collectionView.dataSource = self;

    _collectionView.delegate = self;

    _collectionView.backgroundColor = [UIColor redColor];

   [_collectionView registerClass:[photoCollectionViewCell class] forCellWithReuseIdentifier:@"photo"];

   [self.view addSubview:_collectionView];

    photos = [[NSMutableArray alloc ] init];

    dataArray = [[NSMutableArray alloc ] init];

    [dataArray addObject:[UIImage imageNamed:@"contract_addpic1"]];

}//section

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

    return 1;

}//item个数

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

{

    return dataArray.count;

}

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

{

    NSLog(@"--indexPath.row--%ld",indexPath.row);

    NSLog(@"---indexpath.section--%ld",indexPath.section);

    photoCollectionViewCell *cell = (photoCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"photo" forIndexPath:indexPath];

    cell.tag=indexPath.row;

    //图片

    cell.photoImage.image=dataArray[indexPath.row];

    // 删除按钮

    cell.deleteBtn.tag =indexPath.row;

    cell.deleteBtn.hidden=YES;

    [cell.deleteBtn addTarget:self action:@selector(doClickDeleteButton:) forControlEvents:UIControlEventTouchUpInside];

    //增加按钮

    if (indexPath.row == dataArray.count -1) {

        cell.addBtn.hidden = NO;

    }else

    {

        cell.addBtn.hidden = YES;

    }

    [cell.addBtn addTarget:self action:@selector(doClickAddButton:) forControlEvents:UIControlEventTouchUpInside];

    // 长按删除

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc ] initWithTarget:self action:@selector(longPressedAction)];

    [cell.contentView addGestureRecognizer:longPress];

    return cell;

}#pragma -mark -doClickActions//删除按钮

-(void)doClickDeleteButton:(UIButton *)btn

{

    NSLog(@"-----doClickDeleteButton-------");

    UIAlertView *alert = [[UIAlertView alloc ] initWithTitle:@"提示" message:@"您确定要删除吗？" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

    deleteIndex = btn.tag;

    [alert show];

    NSLog(@"---delete--dataArray---%@",dataArray);

}//增加按钮

-(void)doClickAddButton:(UIButton *)btn

{

    NSLog(@"-----doClickAddButton-------");

    if (wobble) {

        // 如果是编辑状态则取消编辑状态        [self cancelWobble];

    }else{

        //不是编辑状态，添加图片

        if (dataArray.count > Photo) {

            UIAlertView *alert = [[UIAlertView alloc ] initWithTitle:@"提示" message:@"最多支持8个" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];

            [alert show];

        }else

        {

            UIActionSheet *actionSheet = [[UIActionSheet alloc]

                                          initWithTitle:nil

                                          delegate:(id)self

                                          cancelButtonTitle:@"取消"

                                          destructiveButtonTitle:nil

                                          otherButtonTitles:@"拍照", @"我的相册",nil];

            actionSheet.actionSheetStyle = UIActionSheetStyleBlackOpaque;

            [actionSheet showInView:self.view];

        }

    }

    NSLog(@"---add--dataArray---%@",dataArray);

}//长按删除

-(void)longPressedAction

{

    NSLog(@"-----longPressedAction-------");

    wobble = YES;

    NSArray *array =  [_collectionView subviews];

    for (int i = 0; i < array.count; i ++) {

         if ([array[i] isKindOfClass:[photoCollectionViewCell class]]) {

            photoCollectionViewCell *cell = array[i];

            if (cell.addBtn.hidden) {

                cell.deleteBtn.hidden = NO;

            }

            else

            {

                cell.deleteBtn.hidden = YES;

                cell.photoImage.image = [UIImage imageNamed:@"ensure"];

                cell.tag = 999999;

            }

            // 晃动动画

            [self animationViewCell:cell];

        }

    }

}

// 取消晃动

-(void)cancelWobble

{

    wobble = NO;

    NSArray *array =  [_collectionView subviews];

    for (int i = 0; i < array.count; i ++) {

        if ([array[i] isKindOfClass:[photoCollectionViewCell class]]) {

            photoCollectionViewCell *cell = array[i];

            cell.deleteBtn.hidden =  YES;

            if (cell.tag == 999999) {

               cell.photoImage.image = [UIImage imageNamed:@"plus"];

            }

            // 晃动动画

            [self animationViewCell:cell];

        }

    }

}

// 晃动动画

-(void)animationViewCell:(photoCollectionViewCell *)cell

{

    //摇摆

    if (wobble){

        cell.transform = CGAffineTransformMakeRotation(-0.1);

        [UIView animateWithDuration:0.08

                              delay:0.0

                            options:UIViewAnimationOptionRepeat|UIViewAnimationOptionAutoreverse|UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionCurveLinear

                         animations:^{

                             cell.transform = CGAffineTransformMakeRotation(0.1);

                         } completion:nil];

    }

    else{

        [UIView animateWithDuration:0.25

                              delay:0.0

                            options:UIViewAnimationOptionAllowUserInteraction|UIViewAnimationOptionBeginFromCurrentState|UIViewAnimationOptionCurveEaseOut

                         animations:^{

                             cell.transform = CGAffineTransformIdentity;

                         } completion:nil];

    }

}

#pragma -mark -UIActionSheetDelegate

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

    if (buttonIndex == 0) {

        [self openCamera];

    }else if(buttonIndex == 1) {

        [self openPics];

    }

}

#pragma -mark -UIAlertViewDelegate

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

{

    if (buttonIndex == 1) {

        [dataArray removeObjectAtIndex:deleteIndex];

        NSIndexPath *path =  [NSIndexPath indexPathForRow:deleteIndex inSection:0];

        [_collectionView deleteItemsAtIndexPaths:@[path]];

        // 如果删除完，则取消编辑

        if (dataArray.count == 1) {

            [self cancelWobble];

        }

        // 没有删除完，执行晃动动画

        else

        {

            [self longPressedAction];

        }

    }

}

#pragma -mark -camera

// 打开相机

- (void)openCamera {

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

    {

        if (_imagePicker == nil) {

            _imagePicker =  [[UIImagePickerController alloc] init];

        }

        _imagePicker.delegate = (id)self;

        _imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

        _imagePicker.showsCameraControls = YES;

        _imagePicker.allowsEditing = YES;

        [self.navigationController presentViewController:_imagePicker animated:YES completion:nil];

    }

}

// 打开相册

- (void)openPics {

    if (_imagePicker == nil) {

        _imagePicker = [[UIImagePickerController alloc] init];

    }

    _imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    _imagePicker.allowsEditing = YES;

    _imagePicker.delegate = (id)self;

    [self presentViewController:_imagePicker animated:YES completion:NULL];

}

// 选中照片

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];

    [_imagePicker dismissViewControllerAnimated:YES completion:NULL];

    _imagePicker = nil;

    // 判断获取类型：图片

    if ([mediaType isEqualToString:@"public.image"]){

        UIImage *theImage = nil;

        // 判断，图片是否允许修改

        if ([picker allowsEditing]){

            //获取用户编辑之后的图像

            theImage = [info objectForKey:UIImagePickerControllerEditedImage];

        } else {

            // 照片的元数据参数

            theImage = [info objectForKey:UIImagePickerControllerOriginalImage] ;

        }

        [dataArray insertObject:theImage atIndex:0];

        NSIndexPath *path = [NSIndexPath indexPathForRow:0 inSection:0];

        [_collectionView insertItemsAtIndexPaths:@[path]];

    }

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {

    [picker dismissViewControllerAnimated:YES completion:NULL];

}

// 判断设备是否有摄像头

- (BOOL) isCameraAvailable{

    return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];

}

#pragma mark - 相册文件选取相关

// 相册是否可用

- (BOOL) isPhotoLibraryAvailable{

    return [UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

photoCollectionViewCell.h

#import <UIKit/UIKit.h>

@interface photoCollectionViewCell : UICollectionViewCell

@property (weak, nonatomic) IBOutlet UIButton *addBtn;

@property (weak, nonatomic) IBOutlet UIImageView *photoImage;

@property (weak, nonatomic) IBOutlet UIButton *deleteBtn;

@end

photoCollectionViewCell.m

#import "photoCollectionViewCell.h"

@implementation photoCollectionViewCell

- (id)initWithFrame:(CGRect)frame

{

    self = [super initWithFrame:frame];

    if (self)

    {

        // 初始化时加载collectionCell.xib文件

        NSArray *arrayOfViews = [[NSBundle mainBundle] loadNibNamed:@"photoCollectionViewCell" owner:self options:nil];

        // 如果路径不存在，return nil

        if (arrayOfViews.count < 1)

        {

            return nil;

        }

        // 如果xib中view不属于UICollectionViewCell类，return nil

        if (![[arrayOfViews objectAtIndex:0] isKindOfClass:[UICollectionViewCell class]])

        {

            return nil;

        }

        // 加载nib

        self = [arrayOfViews objectAtIndex:0];

    }

    return self;

}

- (void)awakeFromNib {

    // Initialization code}

@end

希望这篇文章可以帮助到你。总之，同学们，你想要的职坐标IOS频道都能找到!