【代码笔记】iOS-collectionView实现照片删除

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