iOS 通过collectionView实现照片删除功能

#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

//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

#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

#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