[Code Note] iOS-collectionView deletes a photo,

[Code Note] iOS-collectionView deletes a photo,

I ,.

2. Engineering Drawing.

3. Code.

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

// Stop deleting when you click the Add button. # 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. // The layout is very interesting. When you set the cell size, the number of cells in a row is determined by the cell width. UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc] init]; // set the cell Size [flowLayout setItemSize: CGSizeMake (70, 70)]; // set its layout Direction [flowLayout setScrollDirection: UICollectionViewScrollDirectionVertical]; // set its border (upper, left, bottom, right) flowLayout. sectionInset = UIEdgeInsetsMake (50,320,); _ collectionView = [[UICollectionView alloc] initWithFrame: CGRectMake (10, * 2) collectionViewLayout: flowLayout]; _ collectionView. dataSource = self; _ collectionView. delegate = self; _ collection View. 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 :( UICollecti OnView *) collectionView {return 1;} // number of items-(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); p HotoCollectionViewCell * cell = (photoCollectionViewCell *) [collectionView dequeueReusableCellWithReuseIdentifier: @ "photo" forIndexPath: indexPath]; cell. tag = indexPath. row; // the cell of the image. photoImage. image = dataArray [indexPath. row]; // Delete the cell. deleteBtn. tag = indexPath. row; cell. deleteBtn. hidden = YES; [cell. deleteBtn addTarget: self action: @ selector (doClickDeleteButton :) forControlEvents: UIControlEventTouch UpInside]; // Add the button if (indexPath. row = dataArray. count-1) {cell. addBtn. hidden = NO;} else {cell. addBtn. hidden = YES;} [cell. addBtn addTarget: self action: @ selector (doClickAddButton :) forControlEvents: UIControlEventTouchUpInside]; // long-pressed Delete objects * longPress = [[delealloc] initWithTarget: self action: @ selector (longPressedAction)]; [cell. contentView ad Response: longPress]; return cell;} # pragma-mark-doClickActions // delete button-(void) doClickDeleteButton :( UIButton *) btn {NSLog (@ "----- doClickDeleteButton -------"); UIAlertView * alert = [[UIAlertView alloc] initWithTitle: @ "prompt" message: @ "are you sure you want to delete it? "Delegate: self cancelButtonTitle: @" cancel "otherButtonTitles: @" OK ", nil]; deleteIndex = btn. tag; [alert show]; NSLog (@ "--- delete -- dataArray --- % @", dataArray);} // Add button-(void) doClickAddButton :( UIButton *) btn {NSLog (@ "----- doClickAddButton -------"); if (wobble) {// if it is in the editing status, cancel the editing status [self cancelWobble];} else {// not in the editing status. Add the image if (dataArray. count> Photo) {UIAlertView * alert = [[UIAlertView alloc] initWithTitle: @ "prompt" message: @ "up to 8" delegate: self cancelButtonTitle: @ "cancel" otherButtonTitles: @ "OK", nil]; [alert show];} else {UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle: nil delegate :( id) self cancelButtonTitle: @ "cancel" destructiveButtonTitle: nil otherButtonTitles: @ "", @ "my album", nil]; actionSheet. actionSheetStyle = UIActionSheetStyleBlackOpaque; [actionSheet showInView: self. view] ;}} NSLog (@ "--- add -- dataArray --- % @", dataArray);} // long-pressed Delete-(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;} // shake animation [self animationViewCell: cell] ;}}// cancel shaking-(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"] ;}// shake animation [self animationViewCell: cell] ;}}// shake animation-(void) animationViewCell :( photoCollectionViewCell *) cell {// swing if (wobble) {cell. transform = transform (-0.1); [UIView animateWithDuration: 0.08 delay: 0.0 options: UIViewAnimationOptionRepeat | updated | UIViewAnimationOptionCurveLinear animations: ^ {cell. transform = complete (0.1);} completion: nil];} else {[UIView animateWithDuration: 0.25 delay: 0.0 options: UIViewAnimationOptionAllowUserInteraction | contents | required 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-marker-(void) alertView :( UIAlertView *) alertView clickedButtonAtIndex :( NSInteger) buttonIndex {if (buttonIndex = 1) {[dataArray removeObjectAtIndex: deleteIndex]; NSIndexPath * path = [NSIndexPath indexPathForRow: deleteIndex inSection: 0]; [_ collectionView deleteItemsAtIndexPaths: @ [path]; // if the deletion is complete, cancel if (dataArray. count = 1) {[self cancelWobble];} // If the animation is not deleted, run the shaking animation else {[self longPressedAction] ;}}. # pragma-mark-camera // open the camera-(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] ;}// open the album-(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];} // select the photo-(void) imagePickerController :( UIImagePickerController *) picker syntax :( NSDictionary *) info {NSString * mediaType = [info objectForKey: Encrypted]; [_ imagePicker dismissViewControllerAnimated: YES completion: NULL]; _ imagePicker = nil; // determine the acquisition type: image if ([mediaType isw.tostring: @ "public. image "]) {UIImage * theImage = nil; // determines whether the image can be modified if ([picker allowsEditing]) {// obtain the edited image theImage = [info objectForKey: UIImagePickerControllerEditedImage];} else {// The metadata parameter theImage = [info objectForKey: UIImagePickerControllerOriginalImage];} [dataArray insertObject: theImage atIndex: 0]; NSIndexPath * path = [NSIndexPath indexPathForRow: 0 inSection: 0]; [_ collectionView insertItemsAtIndexPaths: @ [path];} -(void) Authorization :( UIImagePickerController *) picker {[picker failed: YES completion: NULL];} // determines whether the device has a camera-(BOOL) isCameraAvailable {return [UIImagePickerController isSourceTypeAvailable: album] ;}# pragma mark-album file selection related // album availability-(BOOL) isPhotoLibraryAvailable {return [UIImagePickerController isSourceTypeAvailable: available] ;}- (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) {// load collectionCell during initialization. xib file NSArray * arrayOfViews = [[NSBundle mainBundle] loadNibNamed: @ "photoCollectionViewCell" owner: self options: nil]; // if the path does not exist, return nil if (arrayOfViews. count <1) {return nil;} // if the view in xib does not belong to UICollectionViewCell Class, return nil if (! [[ArrayOfViews objectAtIndex: 0] isKindOfClass: [UICollectionViewCell class]) {return nil;} // load nib self = [arrayOfViews objectAtIndex: 0];} return self ;} -(void) awakeFromNib {// Initialization code} @ end