类似微信选择添加删除图片的demo

仿写了一个类似微信选择添加图片的demo，非常容易添加到工程当中，github地址https://github.com/wubianxiaoxian/AddPicture，主要用到了collectionview

//
//  ViewController.m
//  KevinCollectionView
//
//  Created by Kevin Sun on 15/12/14.
//  Copyright © 2015年 Kevin Sun. All rights reserved.
//

#import "ViewController.h"
#import "CollectionViewCell.h"
#import "KevinPreViewController.h"

static NSMutableArray *currentImages;

@interface ViewController ()<UICollectionViewDataSource,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>{
    UICollectionView *_collectionView;
    
}


@end

@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor=[UIColor whiteColor];
    UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc]init];
    layout.minimumLineSpacing = 0.0f;
    layout.minimumInteritemSpacing = 0.0f;

    _collectionView=[[UICollectionView alloc]initWithFrame:self.view.frame collectionViewLayout:layout];
//    [_collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
//        make.left.right.top.bottom.mas_equalTo(0);
//    }];
    self.navigationController.navigationBar.barTintColor=[UIColor clearColor];

    [self.view addSubview:_collectionView];
    _collectionView.backgroundColor=[UIColor whiteColor];
    _collectionView.delegate=self;
    _collectionView.dataSource=self;
    [_collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"CellIdentifier"];
    if(currentImages ==nil)
    {
        currentImages=[[NSMutableArray alloc] init];
    }

    
    
    // Do any additional setup after loading the view, typically from a nib.
}
-(void)viewWillAppear:(BOOL)animated{
    [_collectionView reloadData];
}
#pragma mark -UIColletionDelegate
//指定setion个数
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return 1;
}
//指定section中的colletionviewCELL的个数
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return currentImages.count==0?1:currentImages.count+1;
}
//配置section中的collectionviewcell的展示
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    CollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"CellIdentifier" forIndexPath:indexPath];
//    cell.backgroundColor=[UIColor redColor];
    
    UIImageView *imageView=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width/4-10, self.view.frame.size.width/4-10)];
    NSLog(@"currentImages.count %ld",currentImages.count);
    for(UIView *view in [cell.contentView subviews])
    {
        [view removeFromSuperview];
    }
    if(currentImages.count==0||indexPath.row==currentImages.count)
    {          NSLog(@"我加载了设置加好图片");
        imageView.image=nil;
//        [cell.contentView removeFromSuperview:imageView];
        imageView.image=[UIImage imageNamed:@"ico.ooopic.com.png"];
    }
    else{
        NSLog(@"我加载了设置背景图片");
        
        while ([cell.contentView.subviews lastObject] != nil) {
            [(UIView*)[cell.contentView.subviews lastObject] removeFromSuperview];
        }
        imageView.image=currentImages[indexPath.row];
    }
    
//    imageView.contentMode=UIViewContentModeScaleAspectFill;
    [cell.contentView addSubview:imageView];
    return  cell;
return cell;
    
}
//指定单元格的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
     return CGSizeMake(self.view.frame.size.width/4-10, self.view.frame.size.width/4-10);

}
////设置每个cell上下左右相距
//- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
//    return UIEdgeInsetsMake(0, 0, 0, 0);
//}
////设置最小行间距 也就是前一行和后一行的中间最小间隔
//- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
//    return 0.0f;
//}
//- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{
//    return 0.0f;
//}
#pragma mark 点击cell
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    if(indexPath.row==currentImages.count)
    {
        UIActionSheet *action=[[UIActionSheet alloc] initWithTitle:@"选取照片" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从摄像头选取", @"从图片库选择",nil];
        [action showInView:self.view];
    }
    else
    {
        [KevinPreViewController setPreviewImage:currentImages[indexPath.row]];
        [self.navigationController pushViewController:[[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"PreviewVC"] animated:YES];
    }

}
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    [picker dismissViewControllerAnimated:YES completion:nil];
    UIImage *image=[info objectForKey:UIImagePickerControllerOriginalImage];
    NSData *tempData=UIImageJPEGRepresentation(image, 0.5f);
    image=[UIImage imageWithData:tempData];
    if(currentImages ==nil)
    {
        currentImages=[[NSMutableArray alloc] init];
    }
    [currentImages addObject:image];
    [_collectionView reloadData];
    // [self saveImage:image withName:@""]
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    [picker dismissViewControllerAnimated:YES completion:nil];
}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    
    switch (buttonIndex) {
        case 0:
            [self openCamera];
            break;
        case 1:
            [self openLibary];
            break;
        default:
            break;
    }
}
-(void)openCamera{
    //UIImagePickerControllerSourceType *type=UIImagePickerControllerSourceTypeCamera;
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker=[[UIImagePickerController alloc] init];
        picker.delegate=self;
        picker.sourceType=UIImagePickerControllerSourceTypeCamera;
        picker.allowsEditing=YES;
        [self presentViewController:picker animated:YES completion:nil];
        
    }
}
-(void)openLibary{
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
    {
        UIImagePickerController *picker=[[UIImagePickerController alloc] init];
        picker.delegate=self;
        picker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
        picker.allowsEditing=YES;
        [self presentViewController:picker animated:YES completion:nil];
        
    }
    
}
-(void) saveImage:(UIImage *)image withName:(NSString *)name
{
    NSData *imageData=UIImageJPEGRepresentation(image, 0.5);
    NSString *path=[NSTemporaryDirectory() stringByAppendingPathComponent:name];
    [imageData writeToFile:path atomically:YES];
    
}
+(void)deleteSelectedImage:(NSInteger)index
{
    if(currentImages!=nil)
        [currentImages removeObjectAtIndex:index];
}
+(void)deleteSelectedImageWithImage:(UIImage *)image{
    if(currentImages!=nil)
        [currentImages removeObject:image];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

github地址 https://github.com/wubianxiaoxian/AddPicture