【移动应用开发技术】如何在iOS中利用collectionView实现一个照片删除功能

【移动应用开发技术】如何在iOS中利用collectionView实现一个照片删除功能

本篇文章给大家分享的是有关如何在iOS中利用collectionView实现一个照片删除功能，在下觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着在下一起来看看吧。，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;

}

@endViewController.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